Completed in 1973, the Army Corps of Engineers dam was designed to regulate how spring snow melt in the Kootenay River watershed (87% of which originates in Canada) enters the downstream watershed. It has done so effectively, but at a considerable price to local residents. The upper end of the reservoir in Canada bears the brunt of the storage draw down each spring, and in dry years, the reservoir’s moonscape does not always refill to a level that allows for much recreation. The control over these water levels is 100% vested in American operation of Libby dam.