Grand Lake St. Marys State Park is a public recreation area located on 13,500-acre (5,500 ha) Grand Lake in Mercer and Auglaize counties, Ohio. Grand Lake is the largest inland lake in Ohio in terms of area, but is shallow, with an average depth of only 5–7 feet (1.5–2.1 m). The state park is open for year-round recreation, including boating, fishing, swimming and hunting. The park consists of the lake and park facilities scattered all around the shore intermingled with private property and a facility operated by Wright State University. It is west of St. Marys, and southeast of Celina, 23 miles (37 km) southwest of Lima in the northwestern part of the state.
ARE Grand Lake St. Marys State Park campsites SOLD OUT?
We can help! Many campsite reservations are cancelled daily. Just tell us when you’d like to camp at Grand Lake St. Marys State Park, and how long you want to camp for. We’ll text you when a suitable spot opens up!Scan for cancellations
Contact Grand Lake St. Marys State Park
- Ohio State Parks
- Booking site: https://reserveohio.com/OhioCampWeb
Spotted an error?
Whoops! Sometimes we make mistakes. Want to help improve the Grand Lake St. Marys State Park listing? Please suggest a correction.
UNABLE TO RESERVE A CAMPSITE?
Get notified when a sold-out campground has availability
Tell us when, where, and how long you want to camp for. We’ll notify you (via SMS) when a suitable spot opens up at that campground—so you can nab that sold-out campsite reservation!