SITTING ASTRIDE THE COLUMBIA RIVER on the eastern approach to the city of The Dalles, the massive, L-shaped concrete structure presents an imposing presence on the landscape. The U.S. Army Corps of Engineers began construction in February 1952 and had completed the project by May 1957. The main portion of the dam consists of a 1,380-foot concrete spillway section containing 23 radial gates, each 50 feet wide and 43 feet high. The powerhouse, expanded in 1973, has an installed generating capacity of 1.8 million kilowatts of power produced by 22 units. The 86-by-675-foot ...

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