The Quemahoning Reservoir, also known to locals as The Dam, is created by the Quemahoning Dam, located on Quemahoning Creek on the border of Quemahoning Township, Conemaugh Township, and Jenner Township in Somerset County, Pennsylvania just south of Hollsopple. The dam was constructed by the Manufacturers Water Company to supply water for the Cambria Iron Company's works in Johnstown, Pennsylvania. Construction was begun in 1910 and completed in 1913.