Annual Report of the Chief of Engineers
on Civil Works Activities
Fiscal Year 1974
Department of the Army Corps of Engineers
Extract Report of Walla Walla District
Little Goose Lock and Dam - Lake Bryan, Washington
Location. Dam is 70.3 miles above mouth of Snake River at head of Herbert G. West Lake (Lower Monumental Reservoir), about 40 airline miles northerly of Walla Walla, Washington, and 50 miles westerly of Lewiston, Idaho.
Existing project. See table 39-B for authorizing legislation. The project includes a dam, powerplant, navigation lock, fish ladder, and appurtenant facilities. Project provides for navigation, hydroelectric power generation, recreation, and incidental irrigation. The reservoir has a normal operating range between Elevations 638 and 633 Mean Sea Level (MSL). Lake Bryan extends upstream about 37.2 miles and provides slackwater to Lower Granite Lock and Dam. Dam structure is 2,600 feet long and about 140 feet high above streambed and consists of a powerhouse, spillway dam, navigation lock, and necessary non-overflow sections. Fish passage facilities include one ladder with entrances on both shores, with a fish channel through the spillway that connects to the powerhouse fish collection system and south shore ladder. Powerhouse now has three 135,000-kilowatt generating units, with provisions for three additional 135,000-kilowatt units, for an ultimate capacity of 810,000 kilowatts. Spillway dam can pass a design flood of 850,000 cubic feet per second. Navigation lock is single-lift type with clear plan dimensions of 86 feet by 668 feet and 15-foot minimum depth over the sills. Relocations along the lake included 36 miles of Camas Prairie Railroad, 7.2 miles of county roads, 2.8 miles of state highways, and Central Ferry Bridge. Principal project data are set forth in table 39-H.
Estimated cost for new work (July 1974) is $202,785,000 consisting of $160,700,000 for the completed project, $42,300,000 for power units 4 through 6, $87,000 for U.S. Coast Guard navigation aids, and $302,000 for value of publicly-owned lands and other cost or value of property transferred from the project.
Local cooperation. None required.
Operations and results during fiscal year. Installation of traveling fish screens was completed. Additions and revisions are being made to the domestic water system. Design of power units 4 through 6 is continuing. Rock slopes along the Camas Prairie Railroad near Penawawa, Washington, were stabilized. Construction of recreation facilities and public use areas along Lake Bryan continued. A draft Environmental Impact Statement was filed with the Council on Environmental Quality.
Operation and Maintenance: A total of 2.74 billion kilowatt hours of electric energy was delivered to Bonneville Power Administration, the marketing agency. A total of 811,872 tons of cargo passed through the navigation lock during calendar year 1973.
Condition at end of fiscal year. Construction began June 1963 and the project was opened to navigation May 1970. Recreational facilities along Lake Bryan are about 82 percent complete, and the entire project is about 95 percent complete.
Remaining items of work consist essentially of completing recreation facilities in the lake area, providing landscaping and visitor facilities at the dam, modifying the fish facilities and the domestic water supply, and installing power generating units 4 through 6.
Power generation through June 1974 has been 10.3 billion kilowatt hours, representing a gross income of $14.5 million to the U.S. Treasury from sale of power by Bonneville Power Administration.