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The St. Croix River is a tributary of the Mississippi River, approximately 164 mi (264 km) long, in the U.S. states of Wisconsin and Minnesota. The lower 125 mi (201 km) of the river forms the state line between Wisconsin and Minnesota. The river is a National Scenic Riverway under the protection of the National Park Service. A hydroelectric plant at St. Croix Falls supplies power to the Minneapolis-St. Paul metropolitan area.