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LocationMarine on St. Croix MN
SizeLarge — multiple days
Acres1,520 acres
Good forHikingCampingFishingPaddlingBirdwatchingWinter Sports
William O'Brien State Park is a 1,520-acre (6.2 km2) state park of Minnesota, USA, along the St. Croix River. Its hiking trails traverse rolling glacial moraine, riparian zones, restored oak savanna, wooded areas and bogs. It is a popular place for birdwatching, picnics, camping, cross-country skiing, canoeing, fishing, and other typical outdoor recreational activities. The park is located approximately two miles north of the town of Marine on St. Croix, Minnesota.