Two distinct campgrounds within William O'Brien State Park give campers different experiences along the St. Croix River. The Savanna campground sits on higher ground with more open terrain, while the Riverway campground hugs the riverbank below the bluffs. Both accommodate RVs up to 60 feet and offer electric hookups, though reviewers note the Savanna area tends to attract "an overwhelming amount of jumbo RVs" due to its straight pull-through sites.
Frogs provide the soundtrack at Savanna sites backing up to wetlands, where one camper reported "at least a million" calling "ALL NIGHT LONG" during May visits. The campground features clean restrooms and shower facilities, though some reviewers mention maintenance needs. Sites 117, 121, and 123 receive praise for privacy and space, while sites directly on the entrance road offer less seclusion. The Riverway campground provides river access and cooling breezes during hot weather, though spring visitors should expect "bone-chilling" winds off the water.
Trail access varies by location within the park. The Savanna campground connects to wetland trails and the Prairie Overlook Trail, where beaver dams and diverse bird populations draw wildlife watchers. River access was temporarily limited due to construction through 2025, affecting eastern trail sections and beach areas. "The hiking at the park was fantastic," notes Mandee L., with surprisingly good elevation changes and river views.
Practical considerations include $8 firewood bundles, minimal T-Mobile cell coverage, and strict enforcement of vehicle permit displays. Raccoons actively visit sites at night, requiring secure food storage. "Deer flies were thick around the water filling station," reports one summer visitor. For additional camping options in the region, see campgrounds near Marine on St. Croix.
This park works well for campers wanting easy access to river recreation and varied hiking terrain, particularly those comfortable with active wildlife and willing to plan around seasonal construction impacts.
Description
Campground is open year-round.
Arrive prepared. Go to mndnr.gov/obrien for visitor alerts and seasonal updates.
RV Road Trip Guides
Location
Public CampgroundWilliam O'Brien State Park Campground is located in Minnesota
Directions
The park is located 12 miles north of Stillwater, just north of the town of Marine on St. Croix. The park entrance is located right on State Highway 95. After turning onto the park road the ranger station is immediately on your right.
Address
16821 O'brien Trail North
Marine On Saint Croix, MN 55047
Coordinates
45.22486246 N
92.77392542 W
Connectivity
- T-Mobile5GExcellent CoverageVerified by 6 usersLast on 3/20/26
- VerizonLTESome CoverageVerified by 2 usersLast on 3/20/26
- AT&T5GExcellent CoverageVerified by 1 userLast on 3/20/26
Connectivity
- T-Mobile5GExcellent CoverageVerified by 6 usersLast on 3/20/26
- VerizonLTESome CoverageVerified by 2 usersLast on 3/20/26
- AT&T5GExcellent CoverageVerified by 1 userLast on 3/20/26
Access
- Walk-InPark in a lot, walk to your site.
Site Types
- Tent Sites
- Standard (Tent/RV)
- Cabins
Features
For Campers
- Market
- ADA Access
- Picnic Table
- Firewood Available
- Phone Service
- Reservable
- Showers
- Electric Hookups
- Toilets
- Pets
- Fires
For Vehicles
- Sanitary Dump
- 50 Amp Hookups
- Big Rig Friendly
Contact
General Info
Reservations
Drive Time
- 41 min from Minneapolis, MN
- 1 hr 18 min from St. Cloud, MN
- 1 hr 24 min from Eau Claire, WI
- 1 hr 39 min from Rochester, MN




















































