Background
Cougar Dam was completed in 1963 at a cost of $54.2 million and the two turbine units were completed in 1964. Cougar Dam is operated in coordination with Blue River Dam to control flooding, and since the completion of the dam, it is estimated that it prevented approximately $452 million in potential flood damages. The dam consists of a rock-fill embankment approximately 1,500 feet (460 m) long, a penstock to power two Kaplan turbines, an emergency spillway capable of a capacity of 76,140 cu ft/s (2,156 m3/s), a regulating outlet, and a diversion tunnel. The diversion tunnel was built to divert the South Fork McKenzie River during the construction of Cougar Dam, and the tunnel was later closed with a concrete plug once the construction of the dam was complete.
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