US Army Corps of Engineers

The Dalles Lock and Dam, built and operated by the U.S. Army Corps of Engineers, is one of the ten largest hydropower dams in the United States. Since its completion in 1957, it has served the Pacific Northwest with reliable water sources for hydropower, navigation, recreation, fish passage, irrigation, and flood mitigation.

This concrete structure, located 192 miles upriver from the mouth of the Columbia River and two miles east of The Dalles, Oregon, has generated over 9.2 billion kilowatt hours of electricity and facilitated the passage of up to 10 million tons of river cargo annually. The project includes a navigation lock, spillway, powerhouse, fish passage facilities, and recreational amenities along Lake Celilo, the 24-mile-long impoundment behind the dam.

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