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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, Grand Coulee originally had two powerhouses.
Kettle Falls was flooded in 1940, when the Grand Coulee Dam impounded the Columbia River to create Lake Roosevelt.The waters behind the dam rose 380 feet (120 m), flooding more than 21,000 acres (85 km 2) of prime bottomland along the river where native peoples lived, as well as the original town of Kettle Falls.
Grand Coulee is two canyons, with an open basin in the middle. The Upper Coulee, filled by Banks Lake, is 25 miles (40 km) long with walls 800 to 900 feet (240 to 270 m) tall. It links to the Columbia River at Grand Coulee Dam and leads southward, through the surrounding highlands. The entry to the coulee is 650 feet (200 m) above the Columbia.
The Hoover Dam on the Colorado River between Arizona and Nevada, constructed between 1931 and 1936, was slightly taller, but Grand Coulee was more than four times as long.
This C-shaped segment of the river is also known as the "Big Bend". During the Missoula Floods 10–15,000 years ago, much of the floodwater took a more direct route south, forming the ancient river bed known as the Grand Coulee. After the floods, the river found its present course, and the Grand Coulee was left dry. The construction of the ...
A tsunami warning was issued for the state’s South Central Oregon Coast and Curry County Coast (Oregon.gov/Oregon Tsunami Clearinghouse) In California, tsunami hazard areas stretch from Crescent ...
When it was built, Grand Coulee Dam was the largest dam in the world, but it was only part of the irrigation project. Additional dams were built at the north and south ends of Grand Coulee, the dry canyon south of Grand Coulee Dam, allowing the coulee to be filled with water pumped up from the Columbia River.
It is capable of producing magnitude-9.0 earthquakes and tsunami waves about 100 feet tall. In 2022, two people died after a ma gnitude - 6.4 earthquake struck offshore near Ferndale , not far ...