It is located approximately 13 miles (21 km) southeast of Cambridge near the village of Senecaville, Ohio.

[1] The Seneca Fork of Wills Creek valley was dammed to create a flood control and water conservation reservoir.

The reservoir presently forms a conservation pool for flood control, recreation, fish and wildlife, and for the maintenance of normal downstream flows during dry periods.

The marina is a full-service facility with boat sales and rentals, fuel, supplies and docking.

The Ohio Division of Wildlife annually leases public fishing and hunting rights on MWCD lakes and lands.

Seneca Lake contains populations of largemouth bass, crappies, bluegills, bullheads, channel catfish, and saugeye.

[4] There is also an Ohio Department of Natural Resources fish hatchery located below Senecaville Dam.

This water supply allows the hatchery to raise saugeye, walleye, hybrid striped bass, and channel catfish.

[5] The hatchery is open to visitors and will accommodate tour groups with advanced reservations.