In 1965, the U.S. Army Corps of Engineers completed construction of the Michael J. Kirwan Reservoir. The reservoir was developed for flood control, water supply, recreation and fish and wildlife management. West Branch State Park was formally opened in 1966. Camping Campground closed for renovations this summer beginning April 2001. There are 103 non-electric sites in both sunny and shaded areas.
Some sites are along the lake with boat tie-ups.
A group camp is available for organizations up to sixty people. Picnicking Picnic areas are situated in scenic locations around the lake. Swimming The park's 700-foot sand beach includes a showerhouse, change booth and snack bar. Fishing access is available at two paved and two gravel launch areas as well as numerous shoreline access points. A valid Ohio fishing license is required.