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2 votes

McNary Dam and the Pacific Salmon Visitor Information Center

Highway 730 to Devore Road, Umatilla, Oregon USA

McNary Dam is a 1.4-mile (2.2-km) long concrete gravity run-of-the-river dam which spans the Columbia River. It joins Umatilla County, Oregon with Benton County, Washington, 292 miles (470 km) upriver from the mouth of the Columbia. It is operated by the U.S. Army Corps of Engineers' McNary Lock and Dam office. The dam is located a mile (2 km) east of the town of Umatilla, Oregon, and 8 miles (13 km) north of Hermiston, Oregon. The dam was originally planned to be named Umatilla Dam, but the Flood Control Act of 1945 renamed the dam in honor of Senator Charles L. McNary of Oregon, who had died the previous year. The dam provides for slackwater navigation, hydroelectric power generation, recreation, wildlife habitat, and incidental irrigation. Water spilling at McNary Dam, seen from the Washington shore in July 2013. Bills for the construction of a dam were introduced in the United States Congress as early as 1931. The United States House of Representatives rivers and harbors committee initially approved the project in April 1941; navigation, power generation, and national security were the major reasons cited for construction of the dam. Construction began in 1947, and was completed in 1954. Activation of all generating units was completed in 1957. Its capacity is 980 MW. There are two fish ladders for salmon and steelhead passage, one on each shore of the dam. The Washington side also has an 86-foot (26 m) wide, 683 foot (208 m) long navigation lock that lifts boats an average of 75 feet (23 m). The dam flooded the Umatilla Rapids, forming a reservoir called Lake Wallula. The lake extends 64 miles (103 km) up the Columbia to the US DOE Hanford Site. It also extends up the Snake River to the Ice Harbor Dam. As with some other dams, it has two additional turbines whose purpose is to power the dam itself. That is, this dam is entirely self-sustaining. In the event of a large-scale grid outage, McNary would provide the black start capability necessary to restart other generation facilities. These two "station service" turbines are only capable of providing about three MW, compared to the 70 MW each of the other 14 turbines. These two turbines alternate service duty to provide the dam with its energy requirements. Plans for a second powerhouse submitted in 1986, which were cancelled in 1991 McNary Dam is part of the Columbia River Basin system of dams. Stats: Altitude: above sea level Height: Length: Navigation lock: Single-lift wide long Powerhouse Fourteen 70,000-kilowatt units Total capacity: 980 megawatts Overload capacity: 1,127 MW Spillway Gates: 22 Length:

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McNary Dam and the Pacific Salmon Visitor Information Center

Highway 730 to Devore Road
Umatilla, Oregon

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