Lake Size: 13,500 Acres Shoreline Length (Miles): 52 Miles Deepest Depth: 7 feet Latitude: 40.521389 Longitude: -84.421389 Lake Level Above Sea Level: 869 ft (265 m) Counties: Auglaize County Cities: Saint Marys
Information: Grand Lake St. Marys was constructed in the early 1800s as a reservoir for the Miami and Erie Canal. In the 1890s oil was discovered in the area, and oil derricks were set up in the lake.
Boating
Fishing
Business
Miscellaneous Info
Boats with no limits on horsepower are permitted on the lake. Five state operated launch ramps provide access to the lake. Several private launch ramps also exist along the shallow shoreline. Fuel, boat rentals and seasonal dock rentals are available. A 300’ no wake zone has been established and is enforced around the lake’s 52 miles of shoreline. The state wildlife refuge, located on the southwest corner is off limits to boats at all times.
Fishing is great year-round and anglers will enjoy excellent catches of crappie, bass and bluegill in the spring as well as record catches of yellow perch in the winter. Bait vending machines are available at the park. Hunting is permitted in designated areas. There are 90 seasonal duck blinds available by a lottery administered by ODNR Division of Wildlife. A valid Ohio hunting and waterfowl stamp is required.
Originally constructed as a feeder reservoir for the Miami-Erie Canal, Grand Lake is recognized as the largest man-made reservoir in the world without the use of machinery. This large 17,500 acre lake is the gateway to swimming, boating, camping and fishing in one of Ohio's oldest state parks.
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