The park's diverse terrain serves as a critical habitat for over 150 species of birds, making it a hotspot for birdwatchers.
The St. Croix River bordering the park is a federally designated Wild and Scenic River.
The park was established in 1945 through a donation of 180 acres by Alice O'Brien in memory of her father.
The park’s landscape features unique 'kettle' lakes, formed by receding glaciers thousands of years ago.
During the 19th century, the area was a significant hub for the regional logging industry, with river drives moving timber downstream.
William O'Brien State Park is a 1,600-acre landscape situated along the St. Croix National Scenic Riverway in Minnesota. The park features diverse terrain including prairie, oak savanna, and flood plain forests. Visitors utilize over 12 miles of hiking trails that wind through these varied ecosystems. The park provides access to the St. Croix River, popular for canoeing and fishing. Camping facilities include 124 drive-in sites, many equipped with electrical hookups, along with group and backpack sites. A dedicated swimming beach is maintained on the shores of Lake Alice. During winter, the park offers groomed cross-country ski trails and snowshoeing opportunities. The visitor center provides educational exhibits regarding the local flora and fauna of the St. Croix Valley.
The overlook deck at the Riverside Trail during sunrise.
Check the water levels of the St. Croix River before planning a canoe outing, as conditions change seasonally.
Bring insect repellent during late spring and summer months to manage mosquitoes and ticks common in the river valley.
Visit during the fall color transition, as the deciduous trees provide extensive foliage views along the river.
Avoid relying solely on cell service, as signal strength can be inconsistent within the deeper ravines of the park.
Park trails remain open year-round; visitor center hours vary significantly by season; cross-country ski trails require a specific state pass in winter.
Practice Leave No Trace principles; keep pets on a six-foot leash at all times; do not move firewood from outside the park to prevent invasive species spread.
