Updated
Grand Lake St Marys State Park
Lake · St. Marys Township, Ohio
No live reading for this spot
No live dataNo live reading for this spot: a Special Weather Statement has been issued for Wayne; Fayette; Union; Franklin; Ripley; Dearborn; Ohio; Switzerland; Carroll; Gallatin; Boone and other areas.
Why, sources & official advisories
- A Special Weather Statement has been issued for Wayne; Fayette; Union; Franklin; Ripley; Dearborn; Ohio; Switzerland; Carroll; Gallatin; Boone and other areas. — NWS Wilmington OH
- No live water-temperature reading for this spot.
No official beach-advisory feed for Ohio yet — follow posted signs and local guidance.
Park on Grand Lake St. Marys reservoir with a campground, swimming areas, boat ramps & fishing.
Things to Do Near Grand Lake St Marys State Park
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Weather at Grand Lake St Marys State Park
49°F, Partly Cloudy · H 68° / L 47° · 3% chance of rain3-day forecast
Frequently asked questions
- Where is Grand Lake St Marys State Park?
- Grand Lake St Marys State Park is a lake in St. Marys Township, Ohio.
- Can you swim at Grand Lake St Marys State Park?
- There is no fixed answer for Grand Lake St Marys State Park: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Grand Lake St Marys State Park in St. Marys Township, Ohio. Check current water conditions before you go, and follow posted signs and local guidance.
- How is Grand Lake St Marys State Park rated?
- Grand Lake St Marys State Park in St. Marys Township, Ohio has an average visitor rating of 4.6 out of 5, based on 90 reviews.
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Location & Contact
St. Marys Township, OH 45885
St. Marys Township, Ohio 45885
🏞️ Best times & visiting tips
- ›Check for boat launch facilities and fees
- ›Obtain required fishing licenses before arrival
- ›Be aware of lake-specific regulations and restrictions
- ›Monitor water quality reports before swimming
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