Copan Dam is a dam in the US state of Oklahoma, Washington County, in the northeastern part of the state. Construction of the earthen dam began in 1972 and was completed in 1983 by the United States Army Corps of Engineers, with a height of 73 feet and a length of 7,730 feet long at its crest. It impounds Little Caney River for flood control and municipal d…Copan Dam is a dam in the US state of Oklahoma, Washington County, in the northeastern part of the state. Construction of the earthen dam began in 1972 and was completed in 1983 by the United States Army Corps of Engineers, with a height of 73 feet and a length of 7,730 feet long at its crest. It impounds Little Caney River for flood control and municipal drinking water. The dam is owned and operated by the Corps of Engineers.
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