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.
I walked the prairie and wet land trails which were beautiful and serene. I imagine that if you're a bird watcher this would be a great spot since there seem to so many.
I can't speak to the trails by the river but the prairie and wet land trails (which is the majority of the park) made for a nice few hours. The paths are marked and well kept for grass and dirt trails.
Meg P. on William O'Brien State Park Upper Pa...
Very picturesque trail along the river. Tall close pines frame the river trail with a soft flat pine needle path.
Loved this trail. I'm partial to bluffs and rivers though. The prairie section is good too, with nicely kept trails. The scenery is fantastic, bring a camera. The park itself isn't too crowded and most of the time you are the only one on the trail.