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

Continuation of Planning and Engineering

McNary Lock and Dam (Second Powerhouse), Oregon and Washington

McNary Second Powerhouse is a proposed addition on the south shore of McNary Lock and Dam on the Columbia River near Umatilla, Oregon. The project will increase the present 1127 megawatt generating capacity by an additional 742 megawatts. Provisions are included for compensation of negative impacts on fish and wildlife. The project is estimated to cost $649,000,000 at October 1, 1984 price levels. Annual power benefits are estimated to be $90,063,000.

The General Design Memorandum Phase I was prepared under the Water Resource Development Act of 1976, Public Law 94-587, and submitted to the Secretary of the Army on July 1, 1981.

Studies were initiated in FY 1982 and continued through FY 1984 on the General Design Memorandum Phase II and the Powerhouse Preliminary Design Report. 1985 expenditures were $21,787 spent on hydraulic model study by Waterways Experiment Station in Vicksburg, Mississippi.