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Grand Lake St. Marys State Park is a state park and public recreation area in the Auglaize and Mercer counties that is open for year-round recreation. Set on the shores of 13,500-acre Grand Lake, which was initially constructed as a feeder reservoir for the Miami-Erie Canal and is the largest inland lake in Ohio today, Grand Lake St. Marys State Park offers an array of outdoor and recreational pursuits, boating, fishing, swimming, hunting, and camping. Facilities in the park’s campground include an amphitheater, bicycle rentals, picnic tables and a children’s playground, mini-golf, basketball courts, a boat launching ramp, a camp store that sells essentials, a dog park, modern restrooms with showers, a swimming pool, and naturalist programs.
Address: 834 Edgewater Drive, Saint Mary’s OH 45885, Phone: 419-394-3611
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