William O'Brien State Park is a 1520acre 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.WildlifeThis park is home to raccoons, white-tailed deer, foxes, minks, beavers and woodchucks. Birdwatchers often spot various raptors, woodpeckers, bluebirds, orioles, herons, and a variety of warblers.
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