South Branch Penobscot River

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South Branch Penobscot River
Country United States
Physical characteristics
Main source Maine
1,860 feet (570 m)
River mouth Seboomook Lake
1,070 feet (330 m)
45°53′53″N 69°57′58″W / 45.898°N 69.966°W / 45.898; -69.966Coordinates: 45°53′53″N 69°57′58″W / 45.898°N 69.966°W / 45.898; -69.966
Length 39 miles (63 km)
Basin features
Progression West BranchPenobscot River

The South Branch Penobscot River is a river in Somerset County, Maine. Its source, Penobscot lake, the north end of which at (45°47′34″N 70°24′36″W / 45.7929°N 70.4099°W / 45.7929; -70.4099 (South Branch Penobscot River source)) is about 1,000 feet (300 m) from the Canada–United States border in Sandy Bay (Maine Township 5, Range 3, NBKP). This section of the border runs along the height of land separating the watersheds of the Penobscot River and the Monument River, which feeds into the Saint Lawrence River.

The South Branch of the Penobscot River runs 39.0 miles (62.8 km)[1] northeast through Canada Falls Lake to its drowned confluence with the North Branch of the Penobscot in Seboomook Lake in Pittston Academy Grant (T.2 R.4 NBKP). The two rivers combine to form the West Branch Penobscot River, which flows east from the outlet of Seboomook Lake.

Canada Falls Lake[edit]

Canada Falls Lake
Location Somerset County, Maine
Coordinates 45°49′N 70°03′W / 45.817°N 70.050°W / 45.817; -70.050[2]
Basin countries United States
Max. length 6 mi (9.7 km)[3]
Surface area 2,305 acres (933 ha)[4]
Max. depth 24 feet (7.3 m)[5]
Water volume 17,841 acre⋅ft (22,007,000 m3)[4]
Surface elevation 1,237 ft (377 m)[2]

Canada Falls Lake is impounded by an early 20th-century dam built on the South Branch Penobscot River 5 miles (8.0 km) upstream of its confluence with the North Branch Penobscot River. The lake created behind the dam in Pittston Academy Grant floods the South Branch Penobscot River westerly into Alder Brook Township and tributary Alder Brook southerly into Soldiertown Township.[3] Most of the lake is less than 15 feet (4.6 m) deep. When full, Canada Falls Lake has the largest surface area of any lake on the South Branch Penobscot River; but the lake is usually drained by late summer, and remains low until filled by snowmelt the following spring. Brook trout spawning upstream of the lake and in tributaries Hale Brook, Mullen Brook, and Cunningham Brook spend the warmer months in cool spring seepage areas in the main river channel through the lake.[5]

See also[edit]


  1. ^ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed June 22, 2011
  2. ^ a b U.S. Geological Survey Geographic Names Information System: Canada Falls Lake
  3. ^ a b The Maine Atlas and Gazetteer (Thirteenth ed.). Freeport, Maine: DeLorme Mapping Company. 1988. p. 48. ISBN 0-89933-035-5.
  4. ^ a b Maine Depts. of Environmental Protection and Inland Fisheries & Wildlife (2005-08-04). "Maine Lakes: Morphometry and Geographic Information". Senator George J. Mitchell Center for Environmental and Watershed Research, The University of Maine. Archived from the original on 2006-09-03. Retrieved 2008-07-31.
  5. ^ a b "Canada Falls Lake" (PDF). Maine Department of Inland Fisheries and Wildlife. State of Maine. Retrieved 7 May 2016.