The lake was originally constructed by the state of Ohio in 1834 to supply water to the Sandy and Beaver Canal.
The park contains a 500-foot sandy beach, one of the few managed swimming areas in the region.
The Sandy and Beaver Canal project, which the lake served, was a major, yet ultimately failed, engineering effort of the 19th century.
The lake depth reaches up to 30 feet in certain areas near the dam.
The park's topography reflects the edge of the glacial boundary, leading to distinct soil and vegetation transitions.
Guilford Lake State Park is a 396-acre public recreation area centered around a 396-acre reservoir in Columbiana County, Ohio. The lake originated as a feeder for the Sandy and Beaver Canal system in the 1830s. The park features a designated 500-foot public swimming beach located on the lake's north shore. Anglers frequent the water for populations of channel catfish, largemouth bass, hybrid striped bass, and crappie. The grounds include 42 non-electric campsites, two launch ramps, and a boat rental facility. Hiking opportunities include the one-mile Dogwood Trail and a half-mile Lakeview Trail. The park's varied terrain encompasses wooded hills and open meadows surrounding the water. It serves as a regional hub for migratory waterfowl and local shorebirds.
The elevated viewing point near the dam offers an unobstructed panoramic view of the entire lake surface.
Check the Ohio Department of Natural Resources website for current water quality advisories before swimming.
Bring bug spray if planning to use the hiking trails, as the wooded areas can be dense with insects during mid-summer.
The boat ramps are busiest on weekend mornings; arrive early to secure a parking spot if towing a trailer.
Do not attempt to swim outside of the designated beach area, as boating traffic is heavy and lake currents near the spillway can be hazardous.
Leashed pets are permitted in designated areas but are prohibited on the swimming beach.
