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 & DatesPark permits: $35 annual, $26 second vehicle, $12 handicapped, or $7 daily. Camping fees are separate.
Book 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. D
- Open in fall
- Open in winter
- Open in summer
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
A quiet place close to nature and not too far from the Cities. Good campsites. The only problem was that there was no ranger on site during the night (in September; I don't know what it's like in...
— H2135QPpatriciaa, September 26, 2022
We stayed in the Vasa camper cabin this past weekend! It was so fun! I slept better in that bed than I do at home! There’s only one complaint. The outdoor bathroom was never cleaned. The...
— moosemagnet1, April 12, 2022
Many great hiking opportunities at William O’Brien State Park. Enjoyed the Upper Park Trail. 5.5 mile hike that includes a variety of landscapes including wetlands, hardwood forest and rolling...
— TravelingSoccerLoon, June 20, 2021
Spent a very hot weekend camping here… Park employees still not fully staffed. Park office closed most of the time. Showers are locked off. Half of the pit toilets are locked. They just have a very...
— herewego2005, June 13, 2021
We stopped here to go hiking on vacation. We hiked the 1.6 mile riverside trail. It was very scenic and had gravel paths. It was also a quick walk and was flat. Unfortunately the gift shop was...
— BVELock, May 2, 2021