Grand Coulee Dam
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Grand Coulee Dam is a concrete gravity dam on the Columbia River in the U.S. state of Washington, built to produce hydroelectric power and provide irrigation water. Constructed between 1933 and 1942,
The dam site before construction, looking south
The east-side cofferdam after the west base was complete
The base of the dam in 1938
Columbia River Treaty
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The Columbia River Treaty is a 1961 agreement between Canada and the United States on the development and operation of dams in the upper Columbia River basin for power and flood control benefits in bo
