Grand Lake St Marys State Park
Mercer County, Ohio · Grand Lake St Mary's · boat-ramp
Boat Ramp boat-ramp
Maintained by: Ohio DNR
Location & Directions
GPS: 40.5036°N, 84.4566°W — Get Directions
Other Access on Grand Lake St Mary's
Data sourced from Ohio DNR public water access records. Last verified: March 19, 2026. Learn how we maintain this data.