Harrison Lake State Park, State park near Fayette, United States.

Harrison Lake State Park is a recreation and nature area in northwestern Ohio centered around a man-made lake and surrounding woodlands. The park grounds include hiking trails, a swimming beach, and facilities for fishing and boating throughout the year.

Harrison Lake was formed in 1939 when Mill Creek, a tributary of the Tiffin River, was dammed. In 1950 the property was transferred to the Ohio Department of Natural Resources so that a state park could be developed around the 95-acre lake.

The park takes its name from Harrison Lake, the 95-acre reservoir created in 1939 by damming Mill Creek, a tributary of the Tiffin River. Anglers come for bluegill, channel catfish, largemouth bass, white crappie and bullhead, and a 3.5-mile trail circles the water past the swimming beach and campground.

The park lies three miles southwest of Fayette, Ohio, reached by road through Fulton County farmland. A 3.5-mile trail circles the 95-acre lake, passing the swimming beach and camping area. The lake reaches about fifteen feet near the dam. The site sits at roughly 236 meters above sea level.

The shoreline and surrounding woodlands form an unexpected natural refuge in the middle of vast crop fields of the Midwest. Visitors can regularly spot waterfowl like great blue herons and common egrets that are otherwise rare in this farming landscape.