Annual Report of the Chief of Engineers
on Civil Works Activities
Fiscal Year 1985
Department of the Army Corps of Engineers
Extract Report of Walla Walla District
Ice Harbor Lock and Dam - Lake Sacajawea, Washington
Location. On Snake River, 9.7 miles above river mouth at head of Lake Wallula and 12 miles east of Pasco, Washington.
Existing project. The project includes a dam, powerplant, navigation lock, two fish ladders, and appurtenant facilities. Project provides for navigation, hydroelectric power generation, recreation, and incidental irrigation. Reservoir has normal operating range between Elevations 440 and 437 Mean Sea Level (MSL). Lake Sacajawea extends upstream about 31.9 miles and provides slackwater to Lower Monumental Lock and Dam. Dam structure is about 2,790 feet long and about 130 feet high above streambed. Beginning at south end, project consists of a concrete non-overflow section, concrete powerhouse, spillway dam, navigation lock, and an earth and rockfill embankment at north abutment. Fish-passing facilities, including two ladders, are provided. Powerplant now has three 90,000-kilowatt units and three 111,000-kilowatt generating units in operation. Spillway dam is 610 feet long, and overflow crest at Elevation 391 MSL is surmounted by 10 radial gates, 50 feet wide and 51 feet high, which provide the capacity to pass a design flood of 850,000 cubic feet per second. Deck is at Elevation 453 MSL, and provides a service road and track for a gantry crane. Navigation lock is single-lift type, with clear plan dimensions of 86 by 675 feet and 15-foot minimum depth over the sills. A navigation channel 250 feet wide and 14 feet deep is provided from the mouth of the Snake River to the dam. Principal data are set forth in table 39-J.
Construction started December 1955 and the project was placed in useful operation January 1962. The project is complete.
An Environmental Impact Statement concerning power units 4 through 6 was filed with the Council on Environmental Quality August 1971.
Power generation through September 1985 has been 53.36 billion kilowatt hours.
Local cooperation. None required.
Operations during fiscal year. New work: Settlement of Washington State Sales and Use Tax Liability.
Maintenance: Normal operation and maintenance continued. Work was started on painting of spillway gates, washers for fish viewing windows, and relocation of sanitary facilities at Levey and Windust Parks. 2.80 billion kilowatt hours of electric energy were delivered to Bonneville Power Administration, the marketing agency. A total of 3,896,607 tons of cargo passed through the navigation lock during calendar year 1984.