Saint Croix. 1 River, 75 mi (121 km) long, rising in the Chiputneticook Lakes and flowing SE to Passamaquoddy Bay, forming part of the U.S.-Canada border; navigable to Calais, Maine. The river is used for power and to float logs downstream. In 1604, French explorer Samuel de Champlain helped establish a colony on St. Croix (Dochet) Island (now an international historic site) near the river's mouth; it was abandoned in 1605. 2 River, 164 mi (264 km) long, rising in the lake district of NW Wis. and flowing generally S to the Mississippi River at Prescott, Wis.; forms part of the Wis.–Minn. line. The Dalles, a scenic gorge, is located in Interstate Park. A hydroelectric plant at St. Croix Falls supplies power to the Minneapolis–St. Paul metropolitan area.