William O'Brien State Park

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William O'Brien State Park

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.

Visitor Alert!

Campsite Reservations

All campsites at William O'Brien State Park are reservable! We encourage you to reserve your campsite in advance. Any site not reserved is available for drop-in camping for one night only. Use self-registration if park staff is unavailable. If additional nights are desired, check with park staff for availability.

Campgrounds Open

Water is on and available in both campgrounds.

Using a GPS Unit to Find the Park?

If you are using a GPS unit to direct you to the park, 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.

Stay on state highway 95 if coming from the north and south directions. The park entrance is located 3 miles south of highway 97 and 2 miles north of Marine on the St. Croix.

Wi-Fi Connectivity

Wi-Fi is available at the Park Office, Visitor Center, and Savanna Campground only. Wi-Fi is not available in the Riverway Campground or the day use area down by the St. Croix River.

(Updated May 20, 2015)

2015 Special Firearm Deer Hunt

William O’Brien State park will be hosting a deer hunt November 14-15, 2015. During this time, the park will be closed to all users except for those hunters who are selected to participate in this deer hunt. Deer hunting permits are available to purchase from any DNR Licensing Authority and from the online license center. You will need to register for the Statewide firearm season (Season A) and select for William O’Brien State Park (area 914 William O’Brien State Park). The last day to register for the deer hunt license lottery is September 10th.

Seasonal Facilities Water Off Dates

The water will be turned off at 4 PM on October 18th.

(Updated August 26, 2015)

Park Notes

Be fascinated. Check out the naturalist programs and other activities scheduled at the park.

Things to see and do at the park:

Need ideas? Here's park staff's list of top stops at the park!

Rental Equipment:

*New* Paddle Boards are available to rent for paddling on Lake Alice.

Canoes and Kayaks are also available to rent for paddling on the St. Croix River and on Lake Alice.

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.

Camper Cabins:

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.

Virtual Tour:

Take a virtual tour. It's a great tool to help you plan your next trip to the park!
Panoramic tour | Snapshot tour

Gift Cards:

Purchase a Minnesota State Parks Gift Card.

Don't move firewood!

Burning non-local firewood can spread invasive species, and it's against Minnesota state law. Learn more. Always buy your firewood at the park, or from an approved local vendor. Find firewood vendors for William O'Brien State Park.


Bird Checklist This is a PDF file. You will need Adobe Acrobat Reader to download it. at William O'Brien State Park.

Park Highlights

tree Camping/Fishing

tree Canoeing on the St. Croix

tree Cross-country Skiing

tree Naturalist Programs

tree Bird Watching

tree Oak Savanna Restoration


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

tel: 651-433-0500

email: williamobrien.statepark@state.mn.us

Getting There

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.
GPS Coordinates:
45 13.521
92 45.827