Report of The Secretary of Army
On Civil Works Activities
For Fiscal Year 1970

Department of the Army
U.S. Army Corps of Engineers
Extract Report of The Walla Walla District

Walla Walla, Wash., District*

The district comprises southeastern Wash., exclusive of watershed of Columbia River and tributaries above and including Yakima River, Wash.; all of Idaho except northern part and a small southeastern portion; a portion of western Wyo.; a small part of northeastern Utah; part of northeastern Nev.; and a part of eastern Oregon.

Improvements

Navigation
1. Other Authorized Navigation Projects
Flood Control
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.		 Bear Creek, Kendrick, Idaho
Blackfoot Reservoir, Idaho
Catherine Creek Lake, Oreg.
Columbia River Basin, Local Flood Protection Projects
Cottonwood Creek Dam, Idaho
John Day River, Oreg., Columbia River Basin, Local Flood Protection Project
Lapwai Creek, Culdesac, Idaho
Lucky Peak Lake, Idaho
Lyman Creek, Idaho
Mill Creek Lake, Wash.
Portneuf River, Lava Hot Springs, Idaho
Ririe Lake, Idaho
Stuart Gulch Dam, Idaho
Tucannon River, Camp Wooten, Wash.
Inspection of Completed Flood Control Projects
Scheduling Flood Control Reservoir Operations
Other Authorized Flood Control Projects
Flood Control Work Under Special Authorization
Multiple-Purpose Projects Including Power
20.
21.
22.
23.
24.
25.
26.
27.
28.		 Dworshak Dam and Reservoir, Idaho
Ice Harbor Lock and Dam, (Lake Sacajawea), Wash.
John Day Lock and Dam (Lake Umatilla), Oreg. & Wash.
Little Goose Lock and Dam (Lake Bryan), Wash.
Lower Granite Lock and Dam, Wash.
Lower Monumental Lock and Dam, Wash.
McNary Lock and Dam (Lake Wallula), Oreg. & Wash.
Snake River Downstream from Johnson Bar Landing, Oreg., Wash., & Idaho
Other Authorized Multiple-Purpose Projects
General Investigations
29.
30.
31.		 Surveys
Collection and Study of Basic Data
Research and Development

*All cost and financial statements for projects are listed at the end of this chapter. All other tables are referenced in text and also appear at the end of this chapter.

NAVIGATION

1. OTHER AUTHORIZED NAVIGATION PROJECTS

See Table 39-B.

FLOOD CONTROL

2. BEAR CREEK, KENDRICK, IDAHO

Location. On left bank of Bear Creek immediately upstream from its confluence with Potlatch River in west central section of Idaho near village of Kendrick.

Existing project. Plan of improvement provides for construction of a revetted levee approximately 1,200 feet long, and channel renovation. Protection provides against a flood of 8,800 cubic feet per second which has an estimated exceedance interval of about once in 200 years. Project was adopted by Chief of Engineers March 11, 1968 under authority of section 205, 1948 Flood Control Act, as amended. Costs of completed project were $133,518, Federal, and $1,750 non-Federal for rights-of-way.

Local cooperation. Fully complied with.

Operations and results during fiscal year. Work under a contract for channel improvement was accomplished.

Condition at end of fiscal year. Construction started in September 1969 and was completed in October 1969.

3. BLACKFOOT RESERVOIR, IDAHO

Location. On Blackfoot River in Caribou County, Idaho, about 40 miles southeast of city of Blackfoot. (See Geological Survey quadrangle sheets Paradise Valley, Cranes Flat, Portneuf, and Henrys Fork location and surroundings in immediate vicinity of project.)

Existing project. Blackfoot Reservoir is owned and operated by Fort Hall Agency of Bureau of Indian Affairs, Department of Interior. Main dam, which is 52 feet high, is a rockfill structure with a concrete core. China Hat Dam, an earthfill structure, closes an arm of reservoir near its upstream end to minimize storage loss due to seepage in pervious formation of that area. Existing main dam structure includes a 3,800-cubic-foot-per-second spillway on the right abutment and an outlet tunnel in left abutment with a capacity of 2,700 cubic feet per second. Reservoir has a usable storage capacity of 413,000 acre-feet at design maximum water surface elevation 6124. However, due to experience with seepage losses from southern end of reservoir, operating level has been limited to about elevation 6120, or about 340,000 acre-feet storage capacity. Water stored in reservoir is used to irrigate lands in Fort Hall Indian Reservation in vicinity of Blackfoot and south. Recommended modifications of the project would provide 38,000 acre-feet additional storage capacity for flood control. Modifications would permit operation of reservoir for flood control to a maximum water surface elevation of 6126. The spillway capacity would be increased to 15,800 cubic feet per second by lowering crest elevation from 6118.5 to 6111.7 and increasing spillway width from 52 feet to 93 feet. Spillway would be equipped with new gates. Outlet works would be modernized and rehabilitated for flood control operation. China Hat Dam would be raised 8 feet and Idaho State Highway No. 34 would be raised in grade for approximately ½ mile along with grade raising of two existing bridges. Recommended modification was authorized by Flood Control Act of 1962. Construction to be accomplished by the Corps, with continued operation of project by Bureau of Indian Affairs. Estimated Federal cost of proposed modifications (July 1970) is $2,790,000.

Local cooperation. None required.

Operations and results during the fiscal year. Preconstruction planning continued throughout the fiscal year.

Condition at end of fiscal year. Modification of Blackfoot Reservoir project in interest of increased flood control or Blackfoot River Basin was first presented as a potential project in review report for Upper Snake River Basin date 1961, which was prepared jointly by Walla Walla district and regional Office of Bureau of Reclamation in Boise, Idaho. That review report was authorized by a Senate Resolution adopted March 19, 1954, which requested a review of House Doc. 531, 81st Congress, 2nd session, with particular reference to Upper Snake River Basin above Weiser, Idaho. In referenced review report, modification of Blackfoot Reservoir project was presented as one of the potential projects warranting early consideration for construction. Interim report on modification of Blackfoot Reservoir, dated March 1962, included additional information and analysis of February 1962 floods and confirmed project economic feasibility. Its is on this latter report that congressional authorization is based.

Hydrology and general design memoranda have been approved. Action is pending on approval of real estate design memorandum and a supplement which have been submitted. Preparation of a feature design memorandum is in progress and is scheduled for publication in October 1970.

4. CATHERINE CREEK LAKE, OREG.

Location. On Catherine Creek about 8 miles above Union, Oreg., in Section 7, Township 5 South, Range 41 East, Willamette Meridian.

Existing project. Dam will be an earth embankment with an impervious core protected by sand and gravel filters. Shell material will consist of granular fill covered with rockfill zones on outside surfaces. Upstream face will be protected by riprap. Effective height will be about 197 feet and crest length 790 feet. A spillway will be in a saddle in left abutment about 1,000 feet from the dam. Spillway will have three 15- by 18.5-foot tainter gates having a capacity of 11,740 cubic feet per second. Lake will contain 61,000 acre-feet of water with 58,000 acre-feet of usable space at elevation 3440. Improvement will provide for flood control, irrigation, municipal and industrial water supply, water quality control, fish and wildlife, recreation, and downstream hydroelectric power. Project was authorized by 1965 Flood Control Act. Estimated Federal cost (July 1970) is $11,500,000.

Local cooperation. The Water Supply Act of 1958 as amended applies. The city of Union, Oreg., by letter dated September 27, 1961, has provided assurances of willingness and ability to meet requirements. Reimbursable costs are estimated to be $349,000 for construction and $1,000 annually for operation, maintenance, and replacement.

The Federal Water Project Recreation Act of 1965 applies. This requirement for local cooperation was added after submittal of the Survey Report. Negotiations are now underway to obtain a letter of assurance from a responsible non-Federal public body. Reimbursable costs for recreation are estimated to be $355,000 for construction and $47,600 annually for operation, maintenance, and replacement.

In accordance with reclamation law, local irrigation interests will be required to repay portions of first costs and annual operations, maintenance, and replacement costs of dam and reservoir allocated to the irrigation function, currently estimated at $1,561,000 and $12,300, respectively. Portion of construction cost beyond ability of irrigators to repay will be returned to reclamation fund from revenues derived from disposition of power marketed through the Bonneville Power Administration. Irrigation districts are to contract for repayment of cost allocated to irrigation.

Operations and results during the fiscal year. Preparation of a hydrology design memorandum and a general design memorandum progressed. Flood regulation studies and scoping studies continued in coordination with the Bureau of Reclamation, Federal water Quality Administration, and other agencies. Mapping was completed and foundation explorations were continued.

Condition at end of fiscal year. Preconstruction planning is approximately 55 percent complete.

5. COLUMBIA RIVER BASIN, LOCAL FLOOD PROTECTION PROJECTS

Location. Improvements included in this project are along Columbia River and its tributaries.

Existing project. Flood Control Act of 1950 approved a general comprehensive plan for Columbia River Basin for flood control and other purposes (H. Doc. 531, 81st Cong., 2d sess.) and authorized $75 million to be appropriated for partial accomplishment of certain projects. Of this authorization, not to exceed $15 million was authorized for construction of local flood protection works throughout Columbia River Basin, subject to conditions that all work undertaken pursuant to this authority shall be economically justified prior to construction, and local cooperation specified in 1936 Flood Control Act, as amended, shall be required. (See table 39-C for local flood projects in Walla Walla District.) (Note: This table does not include improvements in Portland and Seattle Districts.)

Local cooperation. Section 3 of the Flood Control Act approved June 22, 1936, as amended, applies to all the flood control projects.

Operations and results during the fiscal year. Costs were incurred only on John Day River area, Oreg., a fully authorized project which is reported in detail on an individual report.

Condition at end of fiscal year. John Day River area, Oregon., is reported in detail in an individual project report. Boise Valley, Idaho (Ada County Unit) is the only other Columbia River Local Protection Project in a "work-in-progress" status. However, activity on this unit is suspended due to inability of sponsor to obtain the necessary rights-of-way.

6. COTTONWOOD CREEK DAM, IDAHO

Location. On Cottonwood Creek at east city limits of Boise in Ada County, Idaho, in Section 2, Township 3 North, Range 2 East, Boise Meridian.

Existing project. Plan of improvement provides for an earthfill dam with central impervious core, protected filter zone downstream from core and outer zones of random fill. A horizontal drainage blanket downstream from impervious core and a gravel blanket two feet thick will be used for protection of faces against erosion. Dam will be 96 feet high, 24 feet wide at top and 480 feet long at crest. Storage capacity will be 1050 acre-feet at spillway crest elevation with a surface area of 43 acres. A spillway in left abutment will have a capacity of 33,500 cubic feet per second and will be 100 feet wide with concrete sill and 100-foot-wide rock channel. Outlet works with capacity of 250 cubic feet per second will consist of an ungated concrete conduit 39 inches in diameter, with trashrack intake and impact stilling basin. Project provides flood control for city of Boise, Idaho.

Project was authorized under Flood Control Act of 1966 (H. Doc. 486, 89th Cong.). Estimated Federal cost (July 1970) is $2,600,000. Estimated non-Federal cost of lands, damages, and relocations is $502,000.

Local cooperation. Local interests are required to provide lands, easements, and rights-of-way and all relocations required for the project; hold and save the United States free from damages incident to construction; and to operate and maintain project upon completion. Rights-of-way have been acquired.

Operations and results during the fiscal year. A hydrology design memorandum and a general design memorandum were completed and submitted to NPD.

Condition at end of fiscal year. A hydrology design memorandum has been approved and a general design memorandum have been prepared and await approval. No construction has been done.

7. JOHN DAY RIVER, OREG., COLUMBIA RIVER BASIN, LOCAL FLOOD PROTECTION PROJECT

Location. Along the John Day River and Canyon Creek (4.7 miles), in the vicinity of John Day, Oreg. (River Mile 242), and along the John Day River (1.9 miles) in the vicinity of Mount Vernon, Oreg. (River Mile 234).

Existing project. The plan provides for channel improvements and intermittent levee along John Day River and Canyon Creek in the vicinity of John Day and Mount Vernon, Oreg., for a distance of 6.6 miles. Downstream limits of the project in the Mount Vernon area at river mile 233 and the upstream limits in the John Day area are at river mile 243. Project was conditionally authorized under Columbia River Basin plan by section 204, Flood Control Act of 1950, subject to economic justification, which was established in 1962. Estimated Federal cost (July 1969) is $792,000. Estimated non-Federal cost (July 1969) is $203,000 for rights-of-way, irrigation facilities, bridge alterations and relocations. These amounts apply only to aforementioned locations determined to be economically feasible.

Local cooperation. Section 3, Flood Control Act of June 22, 1936, as amended, applies. Assurance resolutions from Grant County and John Day city officials have been accepted. On request, Grant County was granted an extension of time to acquire rights-of-way for the project.

Operations and results during the fiscal year. Preparation of plans and specifications was suspended pending acquisition of rights-of-way by sponsor.

Condition at end of fiscal year. Plans and specifications are estimated to be 65 percent complete. Start of construction is being delayed to permit compliance with local cooperating requirements.

8. LAPWAI CREEK, CULDESAC, IDAHO

Location. On Lapwai Creek through village of Culdesac, Idaho, 20 miles east of Lewiston, Idaho.

Existing project. Plan of improvement provides for minor channel reshaping and riprap placement along left bank levee, with all bridge abutments to be riprapped on both banks. Proposed work covers a reach of approximately 3,200 feet. Project was adopted by Chief of Engineers April 18, 1969 under authority of section 205 of the 1948 Flood Control At, as amended. Estimated costs (1968), excluding $19,800 for cost of Reconnaissance and Detailed Project Reports, are $105,500 Federal and $3,350 non-Federal for rights-of-way, removal of structures, and relocation of utilities.

Local cooperation. Section 3, Flood Control Act of June 22, 1936, as amended, applies. A letter of intent to meet requirements of local cooperation has been received from Board of Trustees for village of Culdesac.

Operations and results during the fiscal year. Preparation of plans and specifications are 85 percent complete. Explorations to find an adequate quarry site are underway. No construction has been done.

Condition at end of fiscal year. Preconstruction planning is complete. No construction has been done.

9. LUCKY PEAK LAKE, IDAHO

Location. On Boise River in southwestern Idaho about 10 miles southeast of city of Boise, and about 12 miles downstream from Arrowrock Reservoir.

Existing project. A rolled-earthfill dam about 250 feet high and 1,700 feet long at crest, with a lake providing a total storage at normal pool level of 306,000 acre-feet. For further details see page 2000 of Annual Report for 1962. Project was authorized by 1946 Flood Control Act. Federal cost of completed project was $19,081,250. Construction of additional recreation facilities for completed project is estimated to cost $506,000 (July 1970), raising total project estimate to $19,587,250.

Local cooperation. None required.

Operations and results during the fiscal year. New work: Operation and Maintenance: Normal operation for flood control and irrigation continued. A contract for $3,500 was awarded and completed for painting miscellaneous metal in the intake tower. Lake water quality studies continued.

Condition at end of fiscal year. Construction of existing project was initiated in November 1949 and completed in June 1961. Improvement and enlargement of recreation facilities by Federal agencies and local interests continue.

10. LYMAN CREEK, IDAHO

Location. New channel starting from a point where Union Pacific Railroad crosses Lyman Creek and extending southwest to Snake River north or Ririe. The general area lies approximately 9.5 miles south of Rexburg.

Existing project. Plan provides for about 4,500 feet of new channel construction with levees along both banks and riprap protection at sharp turns. Proposed channel is designed for a flood of 1,500 cubic feet per second. Project was adopted by Chief of Engineers May 1967, under authority of section 205, 1948 Flood Control Act, as amended. Estimated Federal cost (July 1970), excluding $22,600 for Reconnaissance and Detailed Project Reports is $218,000. Non-Federal cost is estimated to be $21,900 for right-of-way, bridge replacement, and relocations.

Local cooperation. Fully complied with.

Operations and results during the fiscal year. A construction contract was awarded.

Condition at end of fiscal year. Preconstruction planning is completed and construction is scheduled to begin early in fiscal year 1971.

11. MILL CREEK LAKE, WASH.

Location. In and upstream from Walla Walla, Wash., on Mill creek, a tributary of Walla Walla River.

Existing project. Off-stream storage dam, outlet works, diversion works, and division structure were authorized by 1938 Flood Control Act. Channel through city of Walla Walla was added to project by 1941 Flood Control Act (H. Doc. 719, 76th Cong., 3d sess.). For further details see page 2005 of Annual Report for 1962. Federal cost of completed project was $2,162,155. Recreation facilities for completed project cost $68,446 (Corps funds), raising total project costs to $2,230,601.

Local cooperation. Fully complied with. Ordinary operations and maintenance by local interests for calendar year 1969 were performed at a cost of $184,122. Total expenditures to date by local interests are $862,072. For further details see page 2006 of Annual Report for 1962.

Operations and results during the fiscal year. Ordinary general maintenance by Government forces continued, which included routine regulation of lake and care of recreation area.

Condition at end of fiscal year. Construction of dam and appurtenant works was completed in 1942. Paving channel through city of Walla Walla was completed in 1948. Park and recreation facilities were opened to public July 1, 1964. For dates of minor improvements, relocations, and extraordinary maintenance see page 2006 of Annual Report for 1962.

12. PORTNEUF RIVER, LAVA HOT SPRINGS, IDAHO

Location. On Portneuf River, through village of Lava Hot Springs approximately 30 miles south of Pocatello, Idaho.

Existing project. Plan of improvement provides for an enlarged concrete channel and levee through the village of Lava Hot Springs for a distance of 3,000 feet. Project was adopted by Chief of Engineers in August 1968 under authority of section 205 of the 1948 Flood Control Act, as amended. Estimated cost (July 1969) excluding $39,000 for cost of Reconnaissance and Detailed Project Reports, is $747,000 Federal, and $13,800 non-Federal for rights-of-way and relocations.

Local cooperation. Section 3, Flood Control At of June 22, 1936, as amended, applies. A letter of intent to meet requirements of local cooperation has been received from Lava Hot Springs officials.

Operations and results during the fiscal year. Preparation of plans and specifications was continued. Design was restudied to improve environmental impact, if possible.

Condition at end of fiscal year. Preparation of plans and specifications is 30 percent complete. No construction has been done.

13. RIRIE LAKE, IDAHO

Location. On Willow Creek, a tributary of Snake River, in Bonneville County, Idaho. Proposed channel improvement extends from junction of Sand and Willow Creeks to a point on Snake River about 4 miles upstream from city of Idaho Falls, Idaho. (See Geological Survey quadrangle map, Ucon, Idaho.) Damsite is about 5 miles below confluence of Willow Creek and Meadow Creek and about 15 miles northeast of city of Idaho Falls, Idaho. (See Geological Survey quadrangle map, Poplar, Idaho.)

Existing project. Provides for a rockfill dam (about 840 feet long at the crest and 184 feet high above foundation) and downstream channel construction. Spillway will have a concrete-lined channel in right abutment. Outlet works will utilize a reinforced concrete conduit leading from an intake tower upstream to a stilling basin downstream at the toe of left abutment. Lake will have gross capacity of 100,000 acre-feet; 90,000 acre-feet of active storage for flood control, irrigation and recreation; and 10,000 acre-feet dead storage for sediment storage and conservation. Floodway channel will be about 7.5 miles long and have a capacity of 900 cubic feet per second. Existing project was authorized by 1962 Flood Control Act (H. Doc. 562, 87th Cong., 2d sess.). Estimated Federal cost of new work (July 1970) is $17,400,000 Corps of Engineers funds, and $30,000 for value of public-owned lands.

Local cooperation. Fully complied with.

Operations and results during the fiscal year. Preparation of a design memorandum for a flood channel continued. A contract for first portion of main dam and a highway access road was awarded for $1,908,640.

Condition at end of fiscal year. Approximately 60 percent of necessary real estate has been acquired. Main dam construction is underway. Plans and specifications are being prepared for second portion of main dam construction. A design memorandum for a flood channel, and a lake master plan are in progress. Construction was started in June 1967 and entire project is about 27 percent complete.

14. STUART GULCH DAM, IDAHO

Location. On Stuart Gulch, near and north of Boise, Ada County, Idaho, in Sections 21 and 28, Township 4 North, Range 2 East, Boise Meridian.

Existing project. Dam will be earth embankment with central filter zone and a downstream drainage blanket. Random fill portions of embankment consist of sands and silty sands. Upstream and downstream faces and adjacent abutment slopes will be protected against erosion by a gravel blanket. Dam will be 54 feet high and 1,050 feet long at crest. At spillway crest, reservoir will have surface area of 39 acres and storage capacity of 500 acre-feet. An ungated spillway in left abutment with a capacity of 18,700 cubic feet per second has a 150-foot-wide channel and concrete-lined chute. An ungated 100-cubic-foot-per-second outlet works under embankment with 30-inch diameter concrete conduit is provided. Project will provide flood control for city of Boise, Idaho.

Project was authorized under Flood Control Act of 1966 (H. Doc. 486, 89th Cong., 2d sess.). Estimated Federal cost (July 1970) is $1,790,000. Estimated non-Federal cost for land is $219,000.

Local cooperation. Local interests are required to provide lands, easements, rights-of-way, and relocations required for the project; hold and save the United States free from damages incident to construction; and to operate and maintain the project upon completion.

Operations and results during the fiscal year. Preparation of hydrology design memorandum was completed and work continued on a general design memorandum.

Condition at end of fiscal year. Hydrology design memorandum is complete and general design memorandum is 91 percent complete.

15. TUCANNON RIVER, CAMP WOOTEN, WASH.

Location. On upper Tucannon River within Camp Wooten recreational area. Camp is located approximately 21 miles upstream from Marengo, Wash., in Columbia County.

Existing project. Provides for channel renovation and 1,900 feet of levee construction, of which 900 feet is revetted. Improvements are designed to protect the camp from flows up to 4,500 cubic feet per second. Project was adopted by Chief of Engineers January 5, 1968 under section 205, 1948 Flood Control Act, as amended. Estimated Federal cost (July 1970) excluding $8,000 for Reconnaissance and Detailed Project Reports, is $48,500. Non-Federal cost is estimated to be $500 for right-of-way.

Local cooperation. Fully complied with.

Operations and results during the fiscal year. Plans and specifications were completed. Invitations for construction bids were issued.

Condition at end of fiscal year. Preconstruction planning is complete. Construction bid openings are scheduled for July 1970.

16. INSPECTION OF COMPLETED FLOOD CONTROL PROJECTS

Federal law requires local interests to maintain and operate completed local protection projects in accordance with regulations prescribed by Secretary of Army. Inspections were made to determine extent of compliance and to advise local interests as necessary of measures required to correct deficiencies. (See table 39-D for inspections made during fiscal year.)

Fiscal year costs were $13,705. Total costs to June 30, 1970 were $119,987.

17. SCHEDULING FLOOD CONTROL RESERVOIR OPERATIONS

Coordination of functional regulation of non-Corps reservoirs and associated studies was accomplished under several authorities. Regulation of Palisades, Little Wood, and Anderson Ranch Reservoirs in Idaho, and Bully Creek, Warm Springs, and Agency Valley Reservoirs in Oreg., was coordinated under section 7, Flood Control Act of 1944. Formal agreements in connection with operation of reservoirs provided authority for functional coordination of Jackson Lake, Arrowrock Reservoir, and Lake Lowell for flood control. Regulation of American Falls, Owyhee, Magic, Mackay, Cascade, and Deadwood Reservoirs, Idaho, for flood control was coordinated under informal arrangements. Provisions of Federal Power Commission's license to Idaho Power Company were the basis for coordinating functional regulation of Brownlee, Oxbow, and Hells Canyon Reservoirs.

A preliminary Report on Review of Effects on Navigation and Flood Control of Idaho Power Company Projects in Hells Canyon Reach of Snake River was prepared in response to a petition by navigation interests for change of license. In coordination with the Bureau of Reclamation a formal plan of operation under Section 7, Flood Control Act of 1944, and a preliminary report on reservoir regulations for Bully Creek, Warm Springs, and Agency Valley Reservoirs in Malheur River Basin were revised and resubmitted to higher authority. Discussions were begun with the Bureau of Reclamation on the disparity in criteria for spillway design floods developed by the two agencies. The discussions result from questioning the spillway adequacy at Mason Dam on Powder River, Oregon. Fiscal year costs were $17,961.

18. OTHER AUTHORIZED FLOOD CONTROL PROJECTS

See table 39-E.

19. FLOOD CONTROL WORKS UNDER SPECIAL AUTHORIZATION

Flood control activities pursuant to section 205, P.L. 858, 80th Congress, as amended (preauthorization)

See table 39-F for flood control work under special authorization.

Emergency flood control activities—repair and flood fighting and rescue work (P.L. 99, 84th Cong., and antecedent legislation)

Federal cost for fiscal year was $24,694 for advance preparation, $143,890 for flood emergency operations, and $107,469 for repair and restoration.

Snagging and clearing navigable streams and tributaries in interest of flood control (sec. 208, 1954 Flood Control Act, P.L. 780, 83d Cong.)

(See table 39-G for flood control work under special authorization.)

MULTIPLE-PURPOSE PROJECTS INCLUDING POWER

20. DWORSHAK DAM AND RESERVOIR, IDAHO

Location. Damsite is on North Fork Clearwater River 1.9 miles above its junction with Clearwater River, near Orofino, Idaho, and about 35 miles east of Lewiston, Idaho.

Existing project. Project as authorized will provide a straight concrete gravity dam 630 feet in effective height at pool elevation 1,600 and 3,300 feet long at crest elevation 1613. Dam will create a reservoir with a gross storage capacity of 3,468,000 acre-feet, of which 2,016,000 acre-feet will be effective for both local and regional flood control, and for at-site and downstream power generation. In addition, reservoir pool, extending 53 miles into a rugged and relatively inaccessible timberland, will provide important transportation savings in connection with movements of marketable logs and will also afford substantial recreation benefits. Powerhouse will provide two 90,000 and one 220,000 kilowatt generating units initially, with provisions for three additional 220,000 kilowatt units for an ultimate installed capacity of 1,060,000 kilowatts. Principal data concerning spillway dam, powerplant, and impoundment are set forth in Table 39-H under this subject at end of chapter.

No significant runs of salmon occur in North Fork Clearwater River; however, considerable migrations of steelhead trout are recorded at Washington Water Power Co. dam at Lewiston, Idaho, near mouth of Clearwater River. Fish passage is not feasible so a hatchery has been provided to assure continuance of fish runs. Dworshak reservoir is habitat for elk, deer, and other wildlife. Project plans include acquisition of land outside reservoir limits to mitigate losses of big game winter browse areas inundated by reservoir.

Planning was authorized by 1958 Flood Control Act in accordance with plan presented in Senate Doc. 51, 84th Cong., 1st sess. Project authorized for construction by P.L. 87-874. Initial appropriation for construction was by Public Works Appropriation Act of 1962. Estimated total cost for new work (July 1970) is $283,740,000, consisting of $281,000,000 Corps funds, and $2,740,000 for value of public-domain lands.

Local cooperation. None required.

Operations and results during the fiscal year. Main contract for construction of dam and other features continued. Added to this contract is a $6 million multi-level power intake structure on upstream face of dam so that natural river water temperatures downstream can be duplicated to assure continuance of existing fish runs.

Work was completed under contracts for construction of steelhead fish hatchery facilities and for Dent Bridge approach roads. Contracts were awarded for construction of Dent Bridge, and for construction of powerhouse. Several powerhouse supply contracts were awarded. Area schools, impacted by students from the project, continued to receive Federal aid under P.L. 90-483.

Condition at end of fiscal year. Reservoir Master Plan has been submitted. Preparation of specific design memoranda is in progress for buildings and grounds at damsite and for development of recreational sites. Invitations for bids for construction of Grandad Creek Bridge were issued late in fiscal year 1970. All project land has been acquired except that required to replace the loss of wildlife browse areas from inundation by reservoir. All reservoir area marketable timber owned by the Government has been sold. Relocations are estimated to be 19 percent complete; dam, 58 percent complete; fish and wildlife facilities, 41 percent complete; and powerplant, 9 percent completed. Construction of the project started in April 1963, and project is estimated to be 51 percent complete.

21. ICE HARBOR LOCK AND DAM (LAKE SACAJAWEA), WASH.

Location. On Snake River, 9.7 miles above river mouth, at head of McNary Lock and Dam pool, and 12 miles east of Pasco, Wash.

Existing project. A dam, powerplant, navigation lock, fish ladders, appurtenant facilities, and relocation of railroads. Improvement provides for navigation, hydroelectric power generation and incidental irrigation. Dam is designed for a normal pool at elevation 440 mean sea level. Normal pool extends upstream about 31.9 miles, providing slack water to Lower Monumental Lock and Dam site. Structure is about 2,700 feet long. Beginning at south end, project consists of a concrete nonoverflow section, a concrete powerhouse, a spillway dam, a navigation lock, and an earth and rock filled embankment at north abutment. Fish passing facilities, including two ladders, are provided. Powerplant has an initial installation of three 90,000 kilowatt units, with provision for three additional units, an ultimate total of six units. Spillway dam is 610 feet long, and overflow crest at elevation 391 mean sea level is surmounted by 10 radial gates, 50 feet wide by 52.9 feet high which provide capacity to pass spillway design flood of 850,000 cubic feet per second. Deck is at elevation 453 mean sea level and provides a service road and track for a gantry crane. Navigation lock is a single lift type and has clear plan dimensions of 86 by 675 feet. A navigation channel 250 feet wide and minimum depth of 15 feet is provided from mouth of Snake River to dam. Principal data concerning navigation lock, spillway dam, powerplant, and impoundment are set forth in Table 39-H under this subject at end of chapter.

Existing project was authorized by 1945 River and Harbor Act (H. Doc. 704, 75th Cong., 3d sess.). Estimated costs for new work (July 1970) is $157,891,800, consisting of $157,700,000 Corps of Engineers funds, $87,000 for Coast Guard navigation aids, $22,300 Federal funds for value of public-domain lands, and $82,500 non-Federal funds contributed for artificial spawning channel. Construction of additional recreational facilities for completed project is estimated to cost $2,800,000 Corps of Engineers funds, raising total project cost to $160,691,800.

Local cooperation. None required.

Operations and results during the fiscal year. New work: Deferred construction was continued on Union Pacific Railroad. Preconstruction planning for additional generating units was continued.

Code 710 Activity: Planning for development of recreation facilities at Charbonneau Park and Levey Landing progressed.

Operation and maintenance: Normal operation and maintenance of navigation lock and powerplant continued, and 1,983,142 megawatt hours of electric energy were delivered to Bonneville Power Administration, the marketing agency. A total of 282,389 tons of commodities were passed through navigation lock. A $62,000 contract was awarded for resurfacing project roads.

Condition at end of fiscal year. Initial development is complete. Project was placed on a permanent operating basis January 1962, and lake was raised to normal elevation 440 April 1962. Navigation lock was opened to normal traffic in October 1962. Land acquisition is complete. Basic recreation facilities constructed with regular project funds are essentially complete. Construction started in December 1955 and initial project is over 99 percent complete. Preliminary design of 3 additional generating units has been accomplished.

22. JOHN DAY LOCK AND DAM (LAKE UMATILLA), OREG. & WASH.

Location. Site is on Columbia River, about 3 miles downstream from mouth of John Day River and about 215 miles above mouth of Columbia River.

Existing project. A dam, powerplant, navigation lock, fish ladder, and appurtenant facilities with a slackwater pool about 75 miles long extending to McNary Lock and Dam. Included is relocation of railroads, highways, utilities, and communities affected by the impoundment. The project as originally authorized would have provided 2,000,000 acre-feet of flood control storage. As modified the project provides 500,000 acre-feet of flood control storage between minimum pool elevation of 257 and a maximum elevation of 268. Powerhouse provides for 20 generating units of 135,000 kilowatts each. Initial installation consists of 16 units for a total of 2,160,000 kilowatts. Principal data concerning navigation lock, spillway dam, powerplant, and impoundment are set forth in table 39-H under this subject at end of chapter.

A detailed description of project as authorized and modified is on pages 1992 and 1993 of Annual Report for 1962. Estimated Federal cost of new work (July 1970) is $468,507,000, consisting of $469,000,000 Corps of Engineers funds, $333,000 for Coast Guard navigation aids, and a net reduction of $826,000 for value of public-owned land and other property transferred to and from the project without reimbursement.

Local cooperation. None required.

Operations and results during the fiscal year. New work: Four units of 135,000 kilowatts each were put into service during the fiscal year. Contractor completed remaining concrete work. Turbine parts for Unit 16 were placed. Turbine rotating parts were placed in Units 13 through 16. Progress in getting generating units into service has been delayed because of General Electric Co. strike. The navigation channel downstream from navigation lock was dredged to assure a minimum depth of 15 feet. Except for remaining paving on Oregon State Highway 80N and deferred construction, nearly all relocations are completed.

Construction contracts were awarded for modification of a breakwater at Arlington, Oregon, $621,900; pre-stressing spillway gate anchorages, Pier 10, $40,000; and sewage disposal system modification, $51,600. Major supply contracts awarded consisted of 15 KV bus and breaker equipment, $420,900; generators 15 and 16, $4,049,000; and spillway stoplogs, $131,800.

Design studies were nearly completed for recreation facilities scheduled to be advertised in early FY 1971.

Operation and maintenance: Activities during fiscal year 1970, utilizing O&M funds, increased as additional generating units went into service, additional units being as follows: Unit No. 9, 2 Jul 1969; Unit No. 10, 26 Aug 1969; Unit No. 11, 4 Feb 1970; and Unit No. 12, 22 Apr 1970. From electrical generation by these units in conjunction with eight others previously placed in service, 9,011,296 megawatt hours of electric energy were delivered to Bonneville Power Administration, the marketing agency. Cargoes through navigation lock amounted to 2,090,232 tons.

Condition at end of fiscal year. Twelve generating units of 135,000 kilowatts each are producing a total output of 1,620,000 kilowatts. Work continues on the installation of turbines, generators and necessary equipment. Dam completion contract is complete. Relocations are essentially complete except for deferred construction, and paving Oregon State Highway. Miscellaneous relocations, including towns, schools, cemeteries and utilities are estimated to be 98 percent complete. Remaining to complete are two hatcheries for mitigation of fish losses sustained by inundation of spawning areas in Lake Umatilla, recreation facilities, lock guide wall extension. Lock and dam are estimated to be 96 percent complete, powerhouse 97 percent complete, and fish facilities 57 percent complete. Entire project is estimated to be 92 percent complete.

Note: Due to boundary adjustments, this project is now located in the Portland District and henceforth will be reported by that District.

23. LITTLE GOOSE LOCK AND DAM (LAKE BRYAN), WASH.

Location. Site is 70.3 miles above mouth of Snake River, at head of Lower Monumental pool, about 40 airline miles north of Walla Walla, Wash., and 50 miles northwest of Lewiston, Idaho.

Existing project. Provides for a dam, powerplant, navigation lock, and appurtenant facilities. Improvements provide navigation, hydroelectric power generation, recreation, and incidental irrigation. Dam is designed for a normal pool at elevation 638 mean sea level. Normal pool extends upstream about 37.2 miles and provides slack water to Lower Granite Lock and Dam site. Dam structure is approximately 2,600 feet long and consists of a powerhouse, spillway dam, navigation lock, and necessary nonoverflow sections. Fish passing facilities include one ladder with entrances on both shores with a fish channel through spillway which connects to powerhouse fish collection system and south shore ladder. Powerhouse is constructed for three 135,000 kilowatt generating units installed initially, with provisions for three additional 135,000 kilowatt units for an ultimate installed capacity of 810,000 kilowatts. Spillway dam provides capacity to pass a design flood of 850,000 cubic feet per second. Navigation lock is single lift type and has clear plan dimensions of 86 by 675 feet and provides a minimum depth of 15 feet over lock sills. Relocations along the impoundment include 36 miles of Camas Prairie Railroad, 7.2 miles of county roads, 2.8 miles of state highways, and Central Ferry Bridge. Principal data concerning navigation lock, spillway dam, powerplant, and impoundment are set forth in table 39-H under this subject at end of chapter.

Existing project was authorized by 1945 River and Harbor Act (H. Doc. 704, 75th Cong., 3d sess.). Estimated costs for new work (July 1969) is $152,090,000, consisting of $152,000,000 Corps of Engineers funds, $87,000 for Coast Guard navigation aids, and $3,000 for value of public-owned land.

Local cooperation. None required.

Operations and results during the fiscal year. The north abutment embankment enclosure was made on July 18, 1970, and the entire flow of the river was passed through the three skeleton bays of the powerhouse. High water in the Snake River on January 25, 1970 carried large amounts of debris that plugged the trashrack in the three skeleton bays, necessitating closing the gates in the three skeleton bays and passing the entire flow of the river through the spillway. However, on February 16, 1970, as scheduled, the spillway gates were closed and the lake was raised to elevation 638 feet (maximum pool elevation).

Initial power on line occurred on March 26, 1970, when generator No. 1 was put into service.

The navigation lock was opened to normal operation on May 15, 1970.

Work continued throughout the fiscal year on construction of the powerhouse, eight-bay spillway, navigation lock, fish passing facilities, concrete non-overflow dams, and north abutment embankment. Work consisted of constructing the north shore embankment; painting and adjusting spillway gates, navigation lock gates and valves; modified bascule bridges; installation of handrails and miscellaneous metals; road and parking area paving; and general cleanup of area.

The $2,600,000 powerhouse installation contract continued throughout the year with work principally on erection of three 135,000 kilowatt hydraulic turbines, switchgear, piping, electrical wiring, architectural features, and three 850-cubic-foot-per-second turbine driven fishway pumps.

Several contracts consisting of relocations of the Camas Prairie Railroad, relocation of Washington State Highway No. 127 and Central Ferry Bridge, relocation of Whitman and Garfield County roads, and relocation of telephone and power facilities were completed.

Various construction contracts were awarded and consisted of lake clearing; track removal, Camas Prairie Railroad, Central Ferry to Lower Granite; relocation of isolated burial sites (Penawawa), Little Goose recreation facilities; floating bulkhead; permanent operators' quarters; and floating guidewall.

Design studies are nearing completion on recreation facilities, visitor's facilities, and landscaping.

Operation and maintenance: Normal operation and maintenance were begun on completed facilities that were accepted from contractors. A total of 271,413 megawatt hours of electric energy was delivered to Bonneville Power Administration, the marketing agency. Commercial cargoes totaling 335 tons were passed through the navigation lock.

Condition at end of fiscal year. Concrete placing for all structures and north abutment embankment is complete. The lake has been raised to normal maximum elevation of 638 feet. Flow of the river is being passed through generating unit No. 1 and over the spillway. Approximately 0.2 percent of work remains to complete the $71,956,573 main dam contract. Remaining work consists principally of installing miscellaneous metal, handrails, gratings, stairs, mechanical work, and final closure operations.

The $2,600,000 powerhouse installation contract is approximately 90 percent complete. Remaining work to be accomplished consists of completing installation of rotating parts for two 135,000 kilowatt turbines, architectural features and miscellaneous electrical and mechanical equipment.

Relocations of the Camas Prairie Railroad, Washington State Highway No. 127, Central Ferry Bridge, Whitman and Garfield County roads are complete.

Remaining items of work for completion of the project consist essentially of constructing recreation facilities in the lake area, landscaping and visitors' facilities at the dam, and construction of permanent operators' quarters.

Power generating unit No. 1 went on line in March 1970 and the navigation lock was opened to normal operation in May 1970. Construction began in June 1963 and entire project is estimated to be 94 percent complete.

24. LOWER GRANITE LOCK AND DAM, WASH.

Location. Project site is at river mile 107.5 on Snake River at head of Little Goose pool, and about 33 miles downstream from Lewiston, Idaho.

Existing project. Provides for a dam, powerplant, navigation lock and appurtenant facilities, and requires backwater levees near head of pool at Lewiston, Idaho, and Clarkston, Wash. Benefits afforded by project will include slackwater navigation, power generation, recreation, and incidental irrigation. Normal pool elevation of 738 feet mean sea level is to extend upstream about 36 miles and will provide slackwater navigation in Lewiston-Clarkston area. Dam structure will be about 3,200 feet long. It will consist of a powerhouse, spillway dam, navigation lock, necessary nonoverflow sections, and fish passing facilities. Powerplant will be constructed with three 135,000 kilowatt units installed initially, and with provisions for three additional similar units. Spillway will provide capacity to pass a design flood of 850,000 cubic feet per second. Navigation lock will be single lift type (105 feet) and have clear plan dimensions of 86 by 675 feet and provide a minimum depth of 15 feet over lock sills. Backwater levees will be about 10 miles long in Lewiston-Clarkston area. Principal data concerning navigation lock, spillway dam, powerplant, and impoundment are set forth in table 39-H under this subject at end of chapter.

Existing project was authorized by 1945 River and Harbor Act (H. Doc. 704, 75th Cong., 3d sess.). Construction funds were provided by P.L. 89-16. Estimated costs for new work (July 1970) is $245,137,000, consisting of $245,000,000 Corps of Engineers funds, $135,000 for Coast Guard navigation aids, and $2,000 for value of public-owned lands.

Local cooperation. None required.

Operations and results during the fiscal year. Acquisition of land continued. Work was completed on the $4,606,000 contract for relocation of Camas Prairie Railroad between Schultz Bar and Wawawai and for the Camas Prairie Railroad section facilities. Earnings under supply contracts for turbines, transformers, and governors continued. Main dam contract was awarded for $105,202,637.

Condition at end of fiscal year. Acquisition of land is estimated to be 48 percent complete. Construction under main dam contract is progressing. Design is continuing for relocation of remaining portion of Camas Prairie Railroad from Wawawai to Lewiston. Supply contracts for three large turbines costing $4,061,000, three power transformers costing $1,038,000, and three turbine governors costing $324,000 are 95 percent, 5 percent, and 61 percent complete, respectively. Invitations for bids for these large generators have yet to be issued. Preparation of specific design memoranda is continuing for the following: North Lewiston levee, West Lewiston levee, East Lewiston levee, Clarkston levee, utility relocations, and road relocations. Entire project, including land acquisition, is estimated to be about 17 percent complete.

25. LOWER MONUMENTAL LOCK AND DAM, WASH.

Location. On Snake River at head of Ice Harbor pool, about 45 miles northeast of Pasco, Wash.

Existing project. Provides for construction of a dam, powerplant, navigation lock, relocation of railroads and highways above pool level at elevation 540 feet mean sea level, and appurtenant facilities. The impoundment extends about 30 miles upstream to the site of Little Goose Lock and Dam. The dam, located at upper end of the impoundment created by Ice Harbor Dam, raised water surface about 100 feet, and is concrete gravity with earthfill and rockfill abutments 135 feet high (above streambed) and 3,800 feet long (including abutments, spillway, navigation lock and powerhouse). Fish ladders have been provided, one at each end of the dam. Powerhouse has three 135,000 kilowatt units installed initially, and a substructure for three additional units, for an ultimate total of 810,000 kilowatts. Spillway is 508 feet long, and overflow crest at elevation 483 feet above mean sea level is surmounted by 8 radial gates, each 50 feet wide and 60.5 feet high. Deck is at elevation 553 feet and provides a service road and track for a gantry crane. Navigation locks is single lift type, which lock chamber 86 by 675 feet, providing a minimum depth of 15 feet over lock sills. Reservoir capacity at elevation 540 is 376,000 acre-feet. Principal data concerning navigation lock, spillway dam, powerplant, and impoundment are set forth in table 39-H under this subject at end of chapter.

Existing project was authorized by 1945 River and Harbor Act (H. Doc. 704, 75th Cong., 3d sess.). Estimated costs for new work (July 1970) is $176,102,000 including $176 million Corps funds, $87,000 Coast Guard funds for navigation aids, and $15,000 for value of public-domain lands.

Local cooperation. None required.

Operations and results during the fiscal year. New work, hired labor: Engineering and design work continued.

New work, contract: The first stage development of recreation and public-use areas was completed in August 1969. Work on powerhouse and installation of mechanical and electrical equipment was completed in March 1970. Permanent operators' quarters were completed in February 1970. Lake clearing was completed in December 1969. The second generator went on the line September 8, 1969, and the third generator, January 6, 1970.

Operation and maintenance: Normal operation and maintenance continued. A contract was completed for navigation lock monolith joint seals at a cost of $62,825. A total of 2,207,604 megawatt hours of electric energy was delivered to Bonneville Power Administration, the marketing agency. Cargoes totaling 2,630 tons passed through navigation lock.

Condition at end of fiscal year. Final design work is about 99 percent complete. Construction started in fiscal year 1961 and initial project is about 97 percent complete. Completed items include land acquisition (except one remaining parcel being acquired for environmental control), relocations (except deferred construction), dam, spillway, lock, fish ladders, Marmes rockshelter protective works, upstream floating guide wall, and three generators.

26. McNARY LOCK AND DAM (LAKE WALLULA), OREG. & WASH.

Location. On Columbia River 292 miles above mouth, near Umatilla, Oreg., and 3 miles above mouth of Umatilla River.

Existing project. A dam, powerplant with 14-power-unit generating installation, navigation lock, fishways, attendant buildings and grounds, levees, drains, pumping plants, incidental irrigation, and modification of railroad bridges over Columbia and Snake Rivers in order to eliminate hazards to navigation. Principal data concerning navigation lock, spillway dam, powerplant, and impoundment are set forth in table 39-H under this subject at end of chapter.

Existing project was authorized by 1945 River and Harbor Act (H. Doc. 704, 75th Cong., 3d sess.). Estimated total cost for new work (July 1970) is $289,212,000, consisting of $290,000,000 Corps of Engineers funds, a net reduction of $851,000 for cost and property transferred from project, and $63,000 for Coast Guard navigation aids. Construction of additional recreation facilities for completed project is estimated to cost $1,800,000, raising total project cost to $291,012,000.

Local cooperation. None required.

Operations and results during the fiscal year. New work: Work was continued under an agreement with Northern Pacific Railway Co. which provides that they design and reconstruct their Snake River Bridge No. 3. Alteration of bridge substructure was completed and work was begun on the superstructure.

Attempts to reach an agreement with Union Pacific Railroad for modification of their Columbia River Bridge having failed, this part of the program was eliminated from McNary project and turned over to U.S. Coast Guard for continuing action under Truman-Hobbs Bridge Act.

Code 710 activity: Planning was continued for further development of recreation facilities in lake area. Additional land at Cold Springs site was acquired. Development was started at Two Rivers area, a site leased to Benton County, Washington. This work is being accomplished on a cost-sharing basis with the County.

Operation and maintenance: Normal operation and maintenance of project continued. Approximately 5,865,183 megawatt hours of electric energy were delivered to Bonneville Power Administration, the marketing agency. A total of 1,958,817 tons of commodities passed through the navigation lock. Installation of equipment at McNary powerhouse for remote control of lower Snake River dams continued in conjunction with Lower Monumental and Little Goose Dams. A contract for $19,600 was completed for construction of project main entrance signs and recreation area entrance signs.

Condition at end of fiscal year. Construction of existing project started May 1947 and is 99 percent complete (June 1970). Project was placed on a permanent operating basis and pool raised to normal operating elevation 340 in December 1953. Except for maintenance interruptions, all 14 power units have been in commercial operation since February 1957. Modification to a railroad bridge over Snake River remains to complete project.

Northern Pacific Railway Co. is progressing with reconstruction of its Snake River Bridge No. 3, and the work is 35 percent completed. Modification involves funding by two projects—McNary Lock and Dam and Lower Monumental Lock and Dam. When Northern Pacific Snake River Branch of the railway was condemned in conjunction with Lower Monumental Lock and Dam project, traffic was subsequently rerouted over Northern Pacific Snake River Bridge No. 3. In order to provide for increased traffic, load bearing capacity of bridge is being upgraded concurrently with navigation modification.

27. SNAKE RIVER DOWNSTREAM FROM JOHNSON BAR LANDING, OREG., WASH., AND IDAHO

Location. On Snake River downstream from Johnson Bar Landing, river mile 231. Snake River, which is largest tributary of Columbia River, rises in Yellowstone National Park in western part of Wyoming, flows generally westerly for about 1,000 miles and empties into Columbia River near Pasco, Wash., 324 miles from Pacific Ocean.

Previous projects. For details see Annual Reports, page 1981 for 1962, page 1991 for 1915, page 2246 for 1903, and page 1986 for 1906.

Existing project. River and Harbor Act of 1945 (H. Doc. 704, 75th Cong., 3d sess.) authorized construction of such dams as are necessary and open channel improvements for purposes of providing slackwater navigation and irrigation between mouth of Snake River and Lewiston, Idaho. This authorization modifies previous authorizations only for that portion of improvement below Lewiston, Idaho. Acts of June 13, 1902, and August 30, 1935, as they pertain to open river improvement from Lewiston, Idaho, to Johnson Bar Landing, are part of existing project.

Improvements included in existing project and estimated Corps costs are Ice Harbor Lock and Dam, $160,500,000, including $2,800,000 for recreation facilities on completed project; Little Goose Lock and Dam, $152,000,000; Lower Granite Lock and Dam, $245,000,000; Lower Monumental Lock and Dam, $176,000,000; and open-river improvement, Lewiston to Johnson Bar Landing, $34,613. Total estimated cost is $733,534,613.

Local cooperation. None required.

Terminal facilities. On Snake River above Ice Harbor Dam are seven privately owned grain handling facilities which upon completion will all be equipped to load barges. Of these facilities four are in use and three are under construction. Also, there are four privately owned terminals below Ice Harbor Dam that provide for loading and unloading barges with petroleum products, chemicals, and Portland cement. In addition, there are four publicly owned marinas and 23 small boat launching ramps, all open to public use. Facilities are adequate until slackwater navigation is available and shipping volume increases following raising of pool behind Little Goose Dam.

Operations and results during the fiscal year. See individual reports for Lower Granite, Little Goose, Lower Monumental and Ice Harbor locks and dams. On Snake River from Lewiston, Idaho, to Johnson Bar Landing reconnaissance and condition surveys were conducted. Navigation aids were repaired and channel was renovated at Cottonwood Rapids.

Condition at end of fiscal year. Costs of existing project were $483,844,962 for new work and $7,179,192 for maintenance, a total of $491,024,154 regular funds. Additional cost of existing project was $82,500 for new work from contributed funds for artificial spawning channel at Ice Harbor Lock and Dam project. (See table 39-I for summary of status of work on existing and previous project authorization.)

28. OTHER AUTHORIZED MULTIPLE PURPOSE PROJECTS

See Table 39-J.

GENERAL INVESTIGATIONS

29. SURVEYS

Total cost of surveys during fiscal year was $243,730. Of that amount $214,692 was for flood control studies, and $29,038 for cooperative studies with Soil Conservation Service and Bureau of Reclamation.

30. COLLECTION AND STUDY OF BASIC DATA

During the fiscal year, flood hazard data for a number of locations in the District were collected and analyzed. Flood information was provided to several Federal agencies, to the states of Idaho, Oreg., Wash., and Wyo., to various cities and counties in these states, and to some private organizations.

Flood plain information reports were completed for Umatilla River in vicinity of Pendleton, Oregon, and for Portneuf River and Tributaries near Pocatello, Idaho. Flood plain information report on Big Wood River at Ketchum, Idaho and vicinity was complete at end of fiscal year but will not be presented to local people until first quarter of fiscal year 1971. In addition, a flood hazard information special report was completed for a 6.8-mile reach of Paradise Creek at Pullman, Washington and vicinity.

Total fiscal year costs were $109,066. (See table 39-K on completed flood plain studies.)

31. RESEARCH AND DEVELOPMENT

Hydrologic investigations to improve runoff and streamflow forecasting procedures and flood frequency evaluations were continued from prior years. Studies were made of flood flows versus causes and of flood frequency statistics versus basin physical and hydrologic environment factors. Fiscal year cost of these studies was $5,715.

 
Table 39-A
Cost and Financial Statement
See
Section
In Text		 Project Funding FY 67 FY 68 FY 69 FY 70 Total to
30 June 1970
2. Bear Creek, Kendrick, Idaho New Work
Approp.
 $850 $13,700 $65,000 $40,027 $133,518
Cost
 9,479 5,183 20,762 92,873 133,518
3. Blackfoot Reservoir, Idaho New Work
Approp.
 10,000 12,316 7,000 84,000 183,316
Cost
 11,428 5,849 14,015 39,807 135,307
4. Catherine Creek Lake, Oreg. New Work
Approp.
     96,000 300,000 396,000
Cost
     89,589 257,833 347,422
5. Columbia River Basin Local Flood Protection
Projects (Consolidated)
 New Work
Approp.
         73,171¹
Cost
         73,171¹
6. Cottonwood Creek Dam, Boise, Idaho New Work
Approp.
   75,000 87,000 26,100 188,100
Cost
   55,498 95,116 15,736 166,350
7. John Day River, Oreg., Columbia Basin Local Flood Protection Project New Work
Approp.
 50,000 — 200,000 -123,000 210,232
Cost
 21,987 24,058 60,523 25,288 209,221²
8. Lapwai Creek, Culdesac, Idaho New Work
Approp.
 — 3,500 12,500 10,000 43,800
Cost
 12,432 3,324 3,322 10,603 34,513
9. Lucky Peak Lake, Boise River, Idaho New Work
Approp.
 16,000 12,800 30,000 -300 19,380,200³
Cost
 15,313 9,006 13,279 583 19,352,1584
Maintenance
Approp.
 129,000 213,000 118,100 138,104 1,539,944
Cost
 125,374 235,884 109,059 137,776 1,528,853
10. Lyman Creek, Idaho New Work
Approp.
 127,000 — — -80,100 83,000
Cost
 12,795 35,336 5,840 3,873 80,714D
11. Mill Creek Lake, Wash. New Work
Approp.
 — — — — 2,230,6015, 6
Cost
 — — — — 2,230,6015, 6
Maint.
Approp.
 108,500 49,800 49,300 50,728 1,077,198
Cost
 113,103 49,261 48,132 52,257 1,075,247
12. Portneuf River, Lava Hot Springs, Idaho New Work
Approp.
 4,000 50,250 — 17,970 107,220
Cost
 10,730 3,703 33,234 22,175 95,585
13. Ririe Lake, Idaho New Work
Approp.
 350,000 750,000 590,000 286,000 2,936,038
Cost
 316,509 657,581 374,807 526,526 2,808,955
14. Stuart Gulch Dam, Idaho New Work
Approp.
   45,000 63,000 -1,100 106,900
Cost
   27,916 59,577 10,409 97,903
15. Tucannon River, Camp Wooten, Wash. New Work
Approp.
 — 7,200 36,000 -35,000 15,700
Cost
 5,011 966 3,504 3,801 15,498
20. Dworshak Dam and Reservoir, Idaho New Work
Approp.
 20,026,000 25,200,000 38,174,000 37,883,900 144,319,100
Cost
 20,518,035 24,223,607 32,178,113 44,057,455 143,22,059
21. Ice Harbor Lock and Dam (Lake Sacajawea), Wash. New Work
Approp.
 910,000 902,200 400,000 17,300 129,664,4517
Cost
 687,819 1,004,806 435,742 50,232 129,526,2718
Maint.
Approp.
 825,000 555,600 657,000 799,685 6,368,685
Cost
 860,185 661,329 678,833 722,922 6,253,673
22. John Day Lock and Dam (Lake Umatilla), Oreg. & Wash. New Work
Approp.
 42,617,000 40,800,000 23,400,000 13,422,662 436,042,562
Cost
 43,161,336 41,001,484 22,001,484 11,799,011 431,780,754
Maint.
Approp.
   78,000 951,000 1,686,997 2,715,997
Cost
   75,983 941,953 1,622,695 2,640,631
23. Little Goose Lock and Dam (Lake Bryan), Wash. New Work
Approp.
 36,000,000 33,050,000 21,900,000 13,404,000 142,834,100
Cost
 35,922,509 31,963,866 21,045,228 15,732,057 142,656,592
Maint.
Approp.
       174,261 174,261
Cost
       168,181 168,181
24. Lower Granite Lock and Dam, Wash. New Work
Approp.
 10,589,000 876,000 17,900,000 -1,496,000 41,133,823
Cost
 5,883,552 4,895,961 8,377,902 8,907,437 41,066,514
25. Lower Monumental Lock and Dam, Wash. New Work
Approp.
 23,400,000 20,686,500 14,300,000 7,632,393 170,560,973
Cost
 25,154,919 23,150,407 14,967,036 7,632,393 170,560,973
Maint.
Approp.
     60,500 574,440 634,940
Cost
     39,413 584,937 624,350
26. McNary Lock and Dam (Lake Wallula), Wash. New Work
Approp.
 95,000 215,000 900,000 1,770,500 288,817,1269
Cost
 32,746 25,973 308,017 1,395,528 287,538,64410
Maint.
Approp.
 1,242,000 1,697,500 1,749,000 1,866,504 25,150,674
Cost
 1,429,281 1,617,826 1,858,283 1,902,130 25,069,848
27. Snake River Downstream from Johnson Bar Landing, Oreg., Wash., &Idaho New Work
Approp.
 70,899,000 55,514,700 54,500,000 19,565,300 484,697,13611
Cost
 67,648,799 61,015,039 44,825,909 32,322,119 484,245,11211
Maint.
Approp.
 825,557 572,512 738,301 1,553,766 7,497,44212
Cost
 862,272 675,411 742,040 1,481,425 7,365,76212
1Comprises the following conditionally authorized projects: Camas Creek, Idaho; Lower Walla Walla River, Wash.; Mill Creek,, Wash.; Mud Lake Area, Idaho; Palouse River, Wash.; Payette Valley, Idaho; South Fork Clearwater River, Idaho; Teton River, Idaho; Touchet River, Wash.; and Whitebird Creek, Idaho. Excludes projects reported under "Other Authorized Flood Control Projects:" Blackfoot Area, Snake River, Idaho; Blackfoot River, Idaho; Boise Valley, Idaho; Grande Ronde Valley, Oregon; Heise-Roberts Extension, Idaho; Kendrick, Potlatch River, Idaho; Little Wood River (Carey), Idaho; Malheur River, Oregon; Portneuf River and Marsh Creek, Idaho; Shelley Area, Snake River, Idaho; Umatilla River (Echo), Oregon; and Weiser River, Idaho. Excludes John Day River Area, Oregon, project reported in detail in an individual report. Does not include amounts for improvements in Portland and Seattle Districts.
2Includes an estimated $71,000 spent for planning on infeasible areas.
3Includes $298,950 allocated for Code 710, Recreation Facilities on Completed Projects.
4Includes $270,908 expended for Code 710, Recreation Facilities on Completed Projects.
5Excludes $80,000 contributed funds.
6Includes $68,446, Code 710, Recreation Facilities on Completed Projects.
7Includes $103,478 allotted for Code 710, Recreation Facilities on Completed Projects.
8Includes $83,673 expended for Code 710, Recreation Facilities on Completed Projects. Excludes $82,500 contributed for artificial spawning channel.
9Includes $302,126 allotted for Code 710, Recreation Facilities on Completed Projects.
10Includes $850,375 net value of non-appropriation transfers of cost or property from project. Includes $301,209 expended for Code 710, Recreation Facilities on Completed Projects.
11Includes $400,150 for new work on previous projects (Pasco to Lewiston). Excludes $167,500 contributed funds for new work consisting of $85,000 for previous projects (Pasco to Riparia), plus $82,500 for new work on existing artificial spawning channel (Ice Harbor Lock and Dam project).
12Includes $186,570 for maintenance on previous projects (Pasco to Lewiston).

 
Table 39-B
Other Authorized Navigation Projects
Project For Last Full Report See Annual Report For Cost to 30 June 1970
Construction Operation
and
Maintenance
Columbia River and Tributaries above Celilo Falls to Kennewick, WA 1968 $1,851,195 $1,108,259
Umatilla Harbor, Oreg.² 1952 — —
1. Obviated by The Dalles, John Day, and McNary Projects.
2. Obviated by John Day Project.

 
Table 39-C
Columbia River Basin, Local Flood Protection Projects
(See Section 5 of Text)
Project Estimated
Federal
Cost 		Status June 30, 1971
Appropriated Cost
Blackfoot Area, Snake River, Idaho¹ ² 42,796 42,796
Blackfoot River, Idaho¹ ² 391,143 391,143
Boise Valley, Idaho¹
Ada County Unit³
 944,000 46,084 46,084
Canyon County Unit4
652,800 10,600 10,600
Camas Creek (feasibility doubtful)5 — 9,080 9,080
Grande Ronde Valley, Oreg.1, 4 8,639,000 102,458 102,458
Heise-Roberts Extension, Idaho¹
Henrys Fork Unit6
165,000 27,800 27,800
Snake River Unit
 ² 3,375,158 3,375,158
John Day River Area, Oreg.3, 7 792,000 210,232 210,221
Kendrick, Potlatch River, Idaho¹ ² 59,941 59,941
Little Wood River Carey, Idaho (Deauthorized April 21,. 1965)1, 8 — 21,334 21,334
Lower Walla Walla River, Wash. (not feasible) — 4,000 4,000
Malheur River, Oreg.
Vale Unit¹
 ² 325,580 325,580
Willow Creek Unit1, 9
 — 13,000 13,000
Mill Creek, Wash. (not feasible) — 3,537 3,537
Mud Lake Area, Idaho (not feasible) — 5,996 5,996
Palouse River, Wash6 914,000 — —
Payette Valley, Idaho6 — 23,178 23,178
Portneuf River and Marsh Creek, Idaho 7
Pocatello Unit
 ² 6,456,032 6,456,032
Inkom-Marsh Creek Unit10
750,000 — —
Shelley Area, Snake River, Idaho¹ ² 32,335 32,335
South Fork Clearwater River, Idaho11 — 3,899 3,899
Teton River, Idaho (not feasible) — 10,387 10,387
Touchet River, Wash. (not feasible) — 11,198 11,198
Umatilla River, Echo, Oreg.1, 12 879,000 24,145 24,145
Weiser River, Idaho1, 6 1,490,000 88,427 88,42713
Whitebird Creek, Idaho11 — 1,896 1,896
Total
   11,300,236 11,299,225
1Reported under "Other Authorized Flood Control Projects."
2Completed Project.
3Economic justification of work proposed has been established in compliance with conditions set forth in Flood Control Act of 1950.
4Deauthorized. Five-year limitation on project authorization reached April 18, 1967.
5Deauthorized. Five-year limitation on project authorization reached March 23, 1965.
6Deferred for restudy.
7Reported in detail in an individual report.
8Deauthorized. Five-year limitation on project authorization reached April 21, 1965.
9Deauthorized. Five-year limitation on project authorization reached October 13, 1969.
10Inactive for lack of local cooperation.
11Emergency construction at this location has obviated need for project.
12Deauthorized. Five-year limitation on project authorization reached November 19, 1964.
13Includes $75,000 spent on feasible Cambridge and Midvale areas.
NOTE: This list does not include improvements in Portland and Seattle Districts.

 
Table 39-D
Inspection of Completed Flood Control Projects
(See Section 16 of Text)
River Basin Number of
Projects		 Month
Inspected		 River Basin Number of
Projects		 Month
Inspected
Blackfoot 1 March 1970 Portneuf 1 January 1970
Boise 1 April 1970 Potlatch 1 November 1969
Esquatzel Coulee 1 July 1969 Salmon 2 August 1969
Little Wood 1 August 1969 Snake 6 June 1970
Malheur 1 May 1970 Touchet 2 August 1969
Mission Creek 1 November 1969 Umatilla 2 January 1970
Palouse 1 November 1969 Walla Walla 3 January 1970
Yakima 1 June 1969

 
Table 39-E
Other Authorized Flood Control Projects
Project For Last Full Report See Annual Report For: Cost to June 30, 1971
Construction Cost to June 30, 1970
Operation & Maintenance
Arlington, Alkali Canyon, Oreg.¹ 1950² 23,459³ —
Blackfoot Area, Snake River, Columbia River Basin, Idaho 1958 42,7964 —
Blackfoot River, Columbia River Basin, Idaho 1965 391,1434 —
Boise Valley, Columbia River Basin, Idaho 1967    
(a) Ada County Unit
   46,084 —
(b) Canyon County Unit5
  10,600 —
Colfax, Palouse River, Wash. 1966 5,557,0084 —
Connell, Wash.6 1967 292,7924 —
Dayton, Touchet River, Wash. 1966 380,6174 —
Grande Ronde Lake, Oreg. 1966 — —
Grande Ronde Valley, Columbia River Basin, Oreg. 7 1958 102,458 —
Heise-Roberts Area, Snake River, Idaho 1955 1,575,8384 —
Heise-Roberts Extension, Columbia River Basin, Idaho 1968    
(a) Henrys Fork Unit
   27,800 —
(b) Snake River Unit
   3,375,1584 —
Jackson Hole, Snake River, Wyo. 1967 2,232,6814 —
Kendrick, Potlatch River, Columbia River Basin, Idaho 1960 59,9414 —
Lewiston-Clarkston Levees8 1950 — —
Little Wood River (Carey), Columbia River Basin, Idaho 5 1960 21,334 —
Malheur Improvement District, Snake River, Oreg. 1957 55,8944 —
Malheur River, Columbia River Basin, Oreg. 1961    
(a) Vale Unit
   325,5804 —
(b) Willow Creek Unit5
  13,000 —
Milton-Freewater, Walla Walla River, Oreg. 1968 1,784,4804, 9 —
Mission and Lapwai Creeks, Idaho6 1965 54,5384 —
Pendleton Levees, Umatilla River, Oreg. 1960    
(a) Riverside Area Unit7
  9,100 —
(b) State Hospital Area (Zone 1)
   267,7484 —
Pendleton, Umatilla River, Oreg. 1939 143,2634 —
Pilot Rock, Birch Creek, Oreg.10 1963 4,558 —
Portneuf River and Marsh Creek, Columbia River Basin, Idaho 1969    
(a) Inkom-Marsh Creek Unit11
  — —
(b) Pocatello Unit
   6,456,0324 —
Pullman, Palouse River, Wash.7 1964 79,370 —
Shelley Area, Snake River, Columbia River Basin, Idaho 1958 32,3354 —
Umatilla River (Echo), Columbia River Basin, Oreg. 5 1960 24,145 —
Weiser River, Columbia River Basin, Idaho7 1960 88,42712D —
Willow Creek Lake, Heppner, Oreg. 1966 — —
Yakima River, West Richland, Wash.6 1964 238,8904 —
1Abandoned. Necessity for development was eliminated when Lake Umatilla was created.
2Reported by Portland District prior to 1956.
3Includes $3,328 spent in fiscal year 1960 under authorization of P.L. 685, 84th Congress. See Annual Report for fiscal year 1960, page 1887.
4Completed project.
5Deauthorized. For specific date, see comprehensive report in Columbia River Basin Local Protection Project.
6Adopted for construction by Chief of Engineers.
7Deferred for restudy.
8Withdrawn as a local flood protection project in June 1959. Included as a feature of Lower Granite Lock and Dam, Snake River, Wash.
9In addition, $6,300 was expended from contributed funds.
10Deauthorized. Five-year limitation on project authorization reached December 2, 1968.
11Includes an estimated $75,000 spent for planning on infeasible areas.

 
Table 39-F
Flood Control Works Under Special Authorization
(See Section 19 of Text)
Project Fiscal
Year
Costs		 Project Fiscal
Year
Costs
Asotin Creek, Asotin, Idaho $2,690 Payette River, Idaho—Chapman Location $6,845
Beech Creek, Mt. Vernon, Oreg. 8,224 Riverview Area, Pasco, Wash. 4,107
Big Canyon Creek, Peck, Idaho 498 Shobe Canyon, Heppner, Oreg. 3,418
Lapwai Creek, Sweetwater, Idaho 8,212 Snake River, Stephens Loc, Blackfoot, Idaho 1,226
Little Canyon Creek, Glenns Ferry, Idaho 1,008 South Fork Clearwater River, Kooskia-Stites Loc., Idaho 1,240
Lower Coppei Creek, Wash. 8,499 Stage Gulch, Stanfield, Oreg. 5,150
Lower Dry Creek, Lowden, Wash. 3,585 Touchet River, Waitsburg, Wash. 18,787
Orofino Creek, Orofino, Idaho 434 Umatilla River, Riverside-Mission, Oreg. 3,205

 
Table 39-G
Flood Control Works Under Special Authorization
Snagging and Clearing
(See Section 19 of Text)
Project and Location Fiscal
Year
Costs		 Completed
Big Wood River, Gimlet, Idaho $42,875 October 1969
Dixie Creek, Prairie City, Oreg. 12,568 August 1969

 
Table 39-H
Principal Data Concerning Navigation Lock, Spillway Dam, Powerplant, and Impoundment
Project
Dworshak Dam and Reservoir, ID
(See Section 20 of Text)		 SPILLWAY DAM
Type of Construction Concrete Gravity
Completed Under Construction
Maximum Capacity 150,500 cubic feet per second
Crest Elevation 1,545 ft
Control Gates:
Type
 Tainter
Size, Width by Height
 50 by 55 ft
Number
 2
POWERPLANT
Length 428 ft
Generating Units:
Number Installed
 3
Space for Additional
 3
Rating, Each
 2 @ 90,000 kW
4 @ 220,000 kW
Total Capacity to be Installed
 400,000 kW
Total Potential Capacity
 1,060,000 kW
Maximum Structural Height 717 feet
IMPOUNDMENT
Elevations:
Normal Operating Range
1600-1445
Maximum
1605
Flood Control Storage 2,016,000 ac.ft.
Lake Length 53.6 mi
Lake Water Surface Area at Elevation 1600 17,090 acres
Length of Shoreline 175 mi
Ice Harbor Lock and Dam, WA
(See Section 21 of Text)		 NAVIGATION LOCK
Clear Width 86 feet
Clear Length 675 feet
Lift:
Minimum
 97 feet
Average
 100 feet
Maximum
 103 feet
Minimum Water Depth Over Sills 15 feet
Open to Navigation April 1962
SPILLWAY DAM
Type of Construction Concrete Gravity
Completed January 1962
Maximum Capacity 850,000 cfs
Crest Elevation 391
Control Gates
Type
 Tainter
Size, Width by Height
 50 ft. by 53 ft.
Number
 10
POWERPLANT
Length 671 feet
Generating Units:
Number Installed
 3
Space for Additional
 3
Rating, Each
 3 @ 90,000 kW
3 @ 110,960 kW
Total Installed Capacity
 602,880 kW
Total Potential Capacity
 602,880 kW
Maximum Structural Height 208 ft
First Power-On-Line December 1961
IMPOUNDMENT
Elevation:
Normal Operating Range
 440-437
Maximum
 446
Lake Length 31.9 miles
Lake Water Surface Area at Elevation 440 9,200 acres
Navigation Channel, Depth by Width 14 ft. by 250 ft.
Length of Shoreline 80 miles
John Day Lock and Dam, Oreg. and Wash.
(See Section 22 of Text)		 NAVIGATION LOCK
Clear Width 86 feet
Clear Length 675 feet
Lift:
Minimum
 97 feet
Average
 105 feet
Maximum
 113 feet
Minimum Water Depth Over Sills 15 feet
Open to Navigation April 1968
SPILLWAY DAM
Type of Construction Concrete Gravity
Completed March 1968
Maximum Capacity 2,250,000 cfs
Crest Elevation 210
Control Gates
Type
 Tainter
Size, Width by Height
 50 ft. by 58.5 ft.
Number
 20
POWERPLANT
Length 1,975 feet
Width 243 feet
Generating Units:
Number Installed
 16
Space for Additional
 4
Rating, Each
 135,000 kW
Total Installed Capacity
 2,160,000 kW
Total Potential Capacity
 2,700,000 kW
Maximum Structural Height 235 feet
First Power-On-Line July 1968
IMPOUNDMENT
Elevation:
Normal Operating Range
 268-257
Maximum
 276
Flood Control Storage 500,000 Ac. Ft.
Lake Length 76.4 miles
Lake Water Surface Area at Elevation 268 55,000 acres
Navigation Channel, Depth by Width 14 ft. by 250 ft.
Length of Shoreline 200 miles
Little Goose Lock and Dam, WA
(See Section 23 of Text)		 NAVIGATION LOCK
Clear Width 86 feet
Clear Length 675 feet
Lift:
Minimum
 93 feet
Average
 98 feet
Maximum
 101 feet
Minimum Water Depth Over Sills 15 feet
Opened to Navigation May 1970
SPILLWAY DAM
Type of Construction Concrete Gravity
Completed January 1970
Maximum Capacity 850,000 cfs
Crest Elevation 581
Control Gates:
Type
 Tainter
Size, Width by Height
 50 ft by 59 ft
Number
 8
POWERPLANT
Length 656 feet
Generating Units:
Number Installed
 3
Space for Additional
 3
Rating, Each
 135,000 kW
Total Installed Capacity
 405,000 kW
Total Potential Capacity
810,000 kW
Maximum Structural Height 235 feet
First Power-On-Line March 1970
IMPOUNDMENT
Elevations:
Normal Operating Range
 638-633
Maximum
 646.5
Lake Length 37.2 miles
Lake Water Surface Area at Elevation 738 10,025 acres
Navigation Channel, Depth by Width 14 ft by 250 ft
Length of Shoreline 92 miles
Lower Granite Lock and Dam, WA
(See Section 24 of Text)		 NAVIGATION LOCK
Clear Width 86 feet
Clear Length 675 feet
Lift:
Minimum
 95 feet
Average
 100 feet
Maximum
 105 feet
Minimum Water Depth Over Sills 15 feet
SPILLWAY DAM
Type of Construction Concrete Gravity
Maximum Capacity 850,000 cfs
Crest Elevation 681 ft
Control Gates:
Type
 Tainter
Size, Width by Height
 50 ft by 59 ft
Number
 8
POWERPLANT
Length 656 feet
Width 243 feet
Generating Units:
Number Installed
 3
Space for Additional
 3
Rating, Each
 135,000 kW
Total Capacity to be Installed
 405,000 kW
Total Capacity Installed
 810,000 kW
Maximum Structural Height 228 feet
IMPOUNDMENT
Elevations:
Normal Operation Range
738-733
Maximum
746.5
Lake Length 39 miles
Navigation Channel, Depth by Width 14 Ft. by 250 Ft.
Lake Water Surface Area at Elevation 738 8,900 acres
Length of Shoreline 91 miles
Lower Monumental Lock and Dam, WA
(See Section 25 of Text)		 NAVIGATION LOCK
Clear Width 86 feet
Clear Length 675 feet
Lift:
Minimum
97 feet
Average
100 feet
Maximum
103 feet
Minimum Water Depth Over Sills 15 feet
Opened to Navigation April 1969
SPILLWAY DAM
Type of Construction Concrete Gravity
Completed March 1969
Maximum Capacity 850,000 cfs
Crest Elevation 483
Control Gates:
Type
Tainter
Size, Width by Height
50 ft by 59 ft
Number
8
POWERPLANT
Length 656 feet
Width 243 feet
Generating Units:
Number Installed
3
Space for Additional
 3
Rating, Each
135,000 kW
Total Installed Capacity
 405,000 kW
Total Potential Capacity
 810,000 kW
Maximum Structural Height 226 feet
First Power-On-Line May 1969
IMPOUNDMENT
Elevations:
Normal Operating Range:
540-537
Maximum
548
Lake Length 29 miles
Lake Water Surface Area at Elevation 540 6,590 acres
Navigation Channel, Depth by Width 14 ft by 250 ft
Length of Shoreline 78 miles
McNary Lock and Dam, OR and WA
(See Section 26 of Text)		 NAVIGATION LOCK
Clear Width 86 feet
Clear Length 675 feet
Lift:
Minimum
67 feet
Average
72 feet
Maximum
83 feet
Minimum Water Depth Over Sills 15 feet
Opened to Navigation December 1953
SPILLWAY DAM
Type of Construction Concrete Gravity
Completed October 1953
Maximum Capacity 2,200,000 cfs
Crest Elevation 291
Control Gates:
Type Vertical Lift
Size, Width by Height 50 feet by 53 feet
Number 22
POWERPLANT
Length 1,348 feet
Width 241 feet
Generating Units:
Number Installed
14
Rating, Each
70,000 kW
Total Capacity Installed
980,000 kW
Maximum Structural Height 220 feet
First Power-On-Line November 1953
IMPOUNDMENT
Elevations:
Normal Operating Range
340-335
Maximum
356.5
Lake Length 64 miles
Lake Water Surface Area at Elevation 340 38,800 acres
Navigation Channel, Depth by Width 14 ft by 250 ft
Length of Shoreline 242 miles

 
Table 30-I
Snake River Downstream From Johnson Bar Landing
Oreg., Wash., and Idaho
(See Section 27 of Text)
Project Estimated Cost (Corps of Engineers Funds Only) Total New Work Appropriations
to June 30, 1971		 Cost to June 30, 1970 Percent
Completed		 Construction
Started
New Work. Maintenance
Ice Harbor Lock and Dam¹ $160,500,000 $129,664,451 $129,526,271 $6,253,674 82² Jan. 1956
Little Goose Lock and Dam¹ 152,000,000 142,834,100 142,656,591 168,181 94 June 1963
Lower Granite Lock and Dam¹ 245,000,000 41,133,823 41,066,514 — 17 July 1963
Lower Monumental Lock and Dam¹ 176,000,000 170,629,999 170,560,973 624,351 97 June 1961
Open River Improvements—
Lewiston to Johnson Bar Landing
 34,613 34,613³ 34,6134 128,636    
Open River Improvement - Pasco to Lewiston — — — 4,350    
Total Existing Project $773,534,613 $484,296,986 $483,844,962 $7,179,192    
Previous Projects—Pasco to Lewiston 400,150 400,150 400,150 186,570    
Total Authorized Projects $733,934,763 $484,697,136 $484,245,112 $7,365,762    
1See individual report.
2Entire project including additional power units, but exclusive of Code 710 recreation facilities.
3Includes $2,800,000 for Code 710 recreation facilities on completed project.
4Maintenance accomplished prior to 1953 with new work funds.

 
Table 39-J
Other Authorized Multipurpose Projects
Project For Last Full Report See Annual Report For: Cost to 30 June 1970
Construction ($) Operation and
Maintenance ($)
Asotin Dam, Snake River, Idaho and Wash. 1964 — —

 
Table 39-K
Completed Flood Plain Studies
(See Section 30 of Text)
Location Requesting Agency Date Completed Federal Cost
Richland, Wash. (Yakima River) City of Richland July 1963 $4,467
Boise, Idaho (Boise River) City of Boise and Ada County Nov. 1967 26,958
Orofino, Idaho (Clearwater River) City of Orofino and Clearwater County May 1968 7,986
Walla Walla, Wash. (Walla Walla River tributaries) Walla Walla County July 1968 23,954
Payette, Idaho (Payette River) Payette County Sept. 1968 23,800
Pullman, Wash. (S.F. Palouse River and Missouri Flat Creek) City of Pullman May 1969 15,969
City of John Day and Canyon City, Oreg. (Canyon Creek) City of John Day, Canyon City, and Grant County Sept. 1969 9,968
Pendleton, Oreg. (Umatilla River) Umatilla county Jan. 1970 19,684
Pocatello, Idaho (Portneuf River) Bannock County May 1970 26,679

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