William O'Brien State Park16821 O'Brien Trail N
Marine On St Croix, MN 55047
The park is located on State Hwy 95, two miles north of Marine on St Croix.Get Directions
William O’Brien State Park sits on the beautiful St. Croix River and is the perfect getaway to enjoy the outdoors. Hiking trails offer quiet exploration of the park's rolling, wooded hills. For anglers, the channels of the St. Croix have northerns, walleye, bass and trout. Ideal for canoeing, the river is also a migratory pathway that offers visitors an exciting diversity of sights and sounds. There are plenty of opportunities to stay overnight, with 124 campsites, 4 group camps, and 4 camper cabins. In the winter, the trails are groomed for skiing and snowshoers can explore the Riverside Trail.
Hours & DatesBook an online reservation 24 hours a day. Phone reservations can be made by calling 866-857-2757 (TTY: 952-936-4008) Apr–Sep, 8 a.m. to 8 p.m. Daily; Oct–Mar, 8 a.m. to 6 p.m. Mon – Fri and 8 a.m. to 2 p.m. Sat & Sun CT
- Daily camping maximum: $23.00
- Daily camping minimum: $17.00
Park permits: $35 annual, $26 second vehicle, $12 handicapped, $7 daily. Camping fees are separate.
- Open in fall
- Open in winter
On-Site Facilities & Services
- Children's programs (scheduled, supervised)
- Evening entertainment (regularly scheduled)
- Located on a lake or river
- Bike trail
- Canoes or kayaks available
- Cross-country ski trail (groomed)
- Hiking trail
- Lake/river access (boat ramp)
- Swimming beach
- Waste reduction/reuse/recycling
- Accessible to disabled
- Can accommodate groups of 45 or more
Number/Type of Campsites
- Number of camping cabins: 4
- Number of camping cabins available in winter: 3
- Number of tent-only sites: 4
- Total number of campsites: 124
- Total number of campsites available in winter: 12
- 50 amp
- Camping accessible to disabled
- Flush toilets in campground
- Group camp facilities
- Hookups available in winter
- Hot showers in campground
- Lodge/central building
- Pets allowed in campsite
- Sanitary dump station
- Secluded campsites
- State Parks Campgrounds
Length of Stay
- Daily site rental
TripAdvisor Traveler Rating
Based on 51 reviews
Great place to get out in nature and away from the city but close enough to the east metro of the Twin Cities making it very accessible. Enjoyed the pleasant Riverside Walk this Fall. Make sure to...
— TravelingSoccerLoon, December 5, 2020
First time hike in William O'Brien. Our kids had a great time looking at all the wildlife next to trails from beavers, geese, and ducks to woodpeckers. This park is unique in Minnesota as it includes...
— Andy M, May 4, 2020
Was not expecting such a wonderful experience. Beautiful after a light snowfall. great vistas and interesting trails. Well maintained trail system and public buildings. looking forward to returning...
— dtoftum, February 10, 2020
Spent Friday and Saturday at the campground. Be prepared no cell phone signal. Local TV stations came in. Was able to have camp fires both nights. It was rainy or misty most of the day. We called...
— Lisa S, October 6, 2019
William O'Brien State Park is a lovely slice of nature along the St. Croix River.
The campsites are typical of most drive-in sites I've seen in parks closer to the metro.
Once onto the walking...
— Ravelsocks, September 27, 2019