Loyalhanna Lake, authorized by the Flood Control Acts of 1936 and 1938, is one of 16 flood damage reduction projects in the Pittsburgh District. An important link in a system of flood control projects, Loyalhanna provides flood protection for the lower Loyalhanna Creek and Kiskiminetas River valleys as well as the lower Allegheny and upper Ohio Rivers. Since its completion in 1951, the Loyalhanna project has prevented flood damage estimated to be in excess of $303 million. The project has the capability to store the equivalent run-off of 6.16 inches of precipitation from its 290 square mile watershed. When compared to the flood protection benefits, the construction cost of $5.5 million appears small.

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