William O'Brien State Park

William O'Brien State Park is a protected area along the St. Croix River featuring rolling wooded hills, grasslands, and varied natural habitats. The grounds include trails that wind through different landscapes, from shaded forests to open areas with river views.

The protected area was officially established in 1947 to safeguard the region's natural resources and habitats. This designation was part of Minnesota's broader effort to preserve wilderness areas for future generations.

The park is named after William O'Brien, an early settler in the region, and today serves as a place where visitors observe native wildlife in their natural setting. People come here to watch birds and learn about the plant life along the St. Croix River.

The park offers camping areas with tent sites and cabins as well as facilities like toilets, showers, and electric hookups for RVs. Those visiting in mild weather can enjoy hiking, while colder months offer other outdoor activity options.

During colder months, the grounds transform into a cross-country skiing destination with specially groomed trails through the wooded areas. This seasonal use gives the park a completely different character than warmer seasons.

Location: Washington County

Inception: 1947

Website: https://dnr.state.mn.us/state_parks/park.html?id=spk00283

GPS coordinates: 45.21920,-92.76580

Latest update: December 10, 2025 20:05