A great "get away" park only one hour from the Twin Cities, William O'Brien provides a beautiful setting for quality recreation along the banks of the St. Croix River. 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. In the winter, snowshoeing, skiing and camping attract enthusiasts.
Tell me more about this park's wildlife, history, geology and landscape.
The water is shut off for the season.
Riverway Campground is closed for the season.
Wi-Fi is available at the park office, visitor center, and the Savanna Campground, so you can get away but still stay connected!
Using a GPS to find us?
Follow the instructions at the bottom of this page, under "Getting There."
Updated Nov. 14, 2017
Things to see and do at the park
Need ideas? Here's park staff's list of top stops at the park!
Walk-in sites 130 and 131 are located next to the Wedge Hill Group Campsites.
Canoes and Kayaks are available to rent for paddling on the St. Croix River and on Lake Alice. Stop at the park office to rent yours.
Equipment for outdoor fun
Use the park's free equipment, and spend more time outdoors! GPS units, fishing poles and tackle boxes, birding kits, horseshoes, volleyballs, soccer balls and bocce balls are available to both our overnight and day use visitors. Adults can check out equipment from the park office.
The park has three year-round camper cabins and one seasonal cabin (available April through October). One year-round camper cabin is accessible, and all four have electricity.
Purchase a Minnesota State Parks Gift Card.
Only use approved firewood!
Help prevent the spread of tree-killing insects by burning only approved firewood, available at all Minnesota State Parks.
Bird Checklist at William O'Brien State Park.
Best time to contact the park:
Spring, Summer & Fall: Daily starting at 8 AM. If no one is available, please leave a message and we will get back to you.
Winter: Hours will vary. If no one is available, please leave a message.
16821 O'Brien Trail North
Marine on St. Croix, MN 55047
The park is located 12 miles north of Stillwater. The park entrance is right on State Highway 95, 3 miles south of Highway 97 and 2 miles north of Marine on St. Croix. After turning onto the park road, the ranger station is immediately on your right.
GPS coordinates: 45 13.521, -92 45.827
If you are using a GPS unit, you must type in the following address to get to the park headquarters and main use area: 19074 St. Croix Trail North, Marine on St. Croix, MN 55047.