Aroostook River /

The Aroostook River is a tributary of the Saint John River, approximately 140 mi (225 km) long, in the U.S. state of Maine and the Canadian province of New Brunswick. Its basin is the largest sub-drainage of the St. John River. The river rises in northeastern Maine from the confluence of Millinocket Stream and Munsungan Stream in Maine Township 8, Range 8, WELS, in northern Penobscot County. The river winds E and NE through Aroostook County. It runs through Ashland, and passes north of Presque Isle and east of Caribou. It joins the Saint John River in Aroostook, New Brunswick, two miles (3 km) after crossing the International Boundary. The United States government maintains two river flow gages on the Aroostook. The first is located near Masardis, Maine (46°31′21″N 68°22′23″W / 46.5225°N 68.37306°W / 46.5225; -68.37306 (Masardis, Maine)) where the rivershed is 892 square miles (2,310 km). The second is at Washburn, Maine (46°46′36″N 68°09′29″W / 46.77667°N 68.15806°W / 46.77667; -68.15806 (Washburn, Maine)) where the rivershed is 1,654 square miles (4,280 km). By Fort Fairfield, Maine the rivershed is 2,301 square miles (5,960 km). At Masardis, the maximum recorded flow is