William O'Brien State Park

William O'Brien State Park near Marine on St. Croix is a small ski area in Minnesota with 191 feet of vertical rise and a base elevation of 993 feet. The park operates during the winter season, offering skiing and snowboarding in a modest foothill setting along the St. Croix River valley.

As a regional ski destination, the terrain is best suited to beginners and intermediate riders looking for accessible winter recreation close to the Twin Cities metro area. The limited vertical and small scale mean this is not a destination for advanced or backcountry skiing, but rather a convenient local hill for families and casual winter sports enthusiasts.