Welcome to the William H. Harsha Lake (also known as East Fork). The lake is situated in Clermont County in southwestern Ohio, about 25 miles east of Cincinnati. The dam is about four miles south of Batavia, Ohio, on the East Fork of the Little Miami River. William H. Harsha exists as a cooperative management effort between the Corps of Engineers and the Ohio Department of Natural Resources - Divisions of Parks and Recreation, Watercraft, and Wildlife. A variety of other partnerships play important roles in the management of the 10,000 plus acres of public lands at William H. Harsha Lake.