Reservations are available year-round at Grand Lake St. Marys State Park Campground in Saint Marys, Ohio, with nightly rates running $29 to $110 depending on site type and hookups. Sites accommodate RVs up to 35 feet and include electric, water, and sewer connections. The campground is large, with pull-through options that work well for families with young children. Cell coverage is good, and WiFi is available on site.
The layout varies noticeably depending on where you land. Some sections have open, unshaded rows that reviewers describe as resembling a parking lot, while a central grassy area has larger trees and shade. Sites near the lake can get muddy after rain. "The campground is big and spacious," notes Megan M., though she points out that conditions vary considerably across the property. Showers are generally clean and within a short walk of most sites. The playground shows some wear, with at least one reviewer flagging rust and sharp metal pieces worth checking before letting young kids loose.
Facilities include a pool, splash pad, putt-putt golf, horseshoe pits, bike rentals, boat docks, and a dump station. The pool operates seasonally and closes for a midday hour. The marina gives anglers and boaters direct access to the lake, which at roughly 13,500 acres is one of the largest inland lakes in the Midwest. That said, the lake has a documented history of algae blooms and water quality issues. Signage about swim conditions has been inconsistent based on multiple recent visits, so checking the Ohio Department of Health advisories before any water contact is worth the extra step.
Off-season camping is possible but comes with trade-offs. Bathrooms and shower houses may be closed in sections, and water availability can be unreliable despite what staff communicate by phone. Andrea F. puts it plainly: "Lesson learned always pull with at least some water." The nearby towns of Celina and Wapakoneta, where Neil Armstrong was born, offer day-trip options when lake conditions limit on-site activities. Campers looking for campgrounds near St. Marys as alternatives or additions to an itinerary have options in the area, including Rustic Haven Campgrounds to the south and Park Grand Resort to the southwest.
This campground suits RV families and boaters who want full hookups and on-site amenities, provided they go in with realistic expectations about the lake's water quality.
Description
Grand Lake Camp Sites 1-120
RV Road Trip Guides
Map & DirectionsGrand Lake St. Marys State Park Campground is located in Ohio near St. Marys
Directions
From jct Hwy-29 & Hwy-364: Go 1 mi S on Hwy-364, then E on Hwy-703.
Address
834 Edgewater Drive
Saint Marys, OH 45885
Coordinates
40.547519 N
84.439451 W
Connectivity
- T-MobileLTESome Coverage
- VerizonLTESome CoverageVerified by 2 usersLast on 5/9/26
- AT&T5GExcellent Coverage
Connectivity
- T-MobileLTESome Coverage
- VerizonLTESome CoverageVerified by 2 usersLast on 5/9/26
- AT&T5GExcellent Coverage
Access
Site Types
- Tent Sites
- RV Sites
- Standard (Tent/RV)
- Group
- Cabins
- Tent Cabin
Features
For Campers
- Market
- Picnic Table
- Firewood Available
- Phone Service
- Reservable
- Showers
- Electric Hookups
- Toilets
- Alcohol
- Pets
- Fires
For Vehicles
- Sewer Hookups
- Water Hookups
- 50 Amp Hookups
- Big Rig Friendly
Contact
General Info
Reservations
Drive Time
- 56 min from Dayton, OH
- 1 hr 6 min from Fort Wayne, IN
- 1 hr 16 min from Springfield, OH
- 1 hr 20 min from Muncie, IN






















