Elastuff - McNary Dam Power House
McNary Dam Power House
Columbia River, WA
McNary Dam is a 1.4 mile (2.2 km) long hydroelectric dam that spans the Columbia River on the Washington/Oregon border. The dam joins Umatilla County, Oregon with Benton County, Washington and is operated by the U.S. Army Corps of Engineers' McNary Lock and Dam office.
The original 125,000 square foot (11,617 m²) BUR with gravel roof over the main powerhouse was replaced in 1985 with a spray-applied polyurethane foam (PUF) system. The new PUF was topcoated with UNITED COATINGS’ Elastuff 850, a high solids, fastcure polyurethane elastomer. A routine maintenance inspection 22 years later found very minimal damage to the roof system. Just a few small punctures were discovered, which were likely the result of mechanical damage, although the roof remained completely leak free. To insure the continued performance of the existing roof, the Corp of Engineers specified a 60 dry mil (1,524 micron) recoat of UNITED’S Elastuff 101/102 polyurethane system.
McNary Dam provides for hydroelectric power generation, slack water navigation, recreation, wildlife habitat, and regional irrigation. Construction began in 1947, and was completed in 1954. Activation of all generating units was completed in 1957. Its capacity is 980 Megawatts. 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) as they navigate up and down the river.
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