Marine On Saint Croix has 2 hiking trails. These trails range from 4.6 to 5.8 miles in length. The most popular trails are William O’Brien State Park and Upper Park Trail. Trails.com member Michael S. recently completed William O’Brien State Park, Upper Park Trail. See all Marine On Saint Croix trails.
William O’Brien State Park, Upper Park Trail
Marine on Saint Croix, MN
This hike begins at the interpretive center and is aptly named the Upper Park Trail. Geologically speaking, the St. Croix ...
William O'Brien State Park
William O’Brien State Park is a popular—and easily accessible—recreation area conveniently located just one hour east of ...