East Branch Penobscot River
East Branch Penobscot River, northeast of Millinocket, Maine.
East Branch Penobscot River is located in Maine
East Branch Penobscot River
CountryUnited States
Physical characteristics
 • locationMaine
 • elevation1,000 feet (300 m)
 • location
Penobscot River
 • coordinates
45°36′32″N 68°32′02″W / 45.60889°N 68.53389°W / 45.60889; -68.53389
 • elevation
240 feet (70 m)
Length75 miles (121 km)
Basin features
 • leftSeboeis River

The East Branch Penobscot River is a 75.3-mile-long (121.2 km)[1] tributary of Maine's Penobscot River. It flows in Piscataquis County and Penobscot County.


From its source (46°16′01″N 69°12′08″W / 46.2670°N 69.2023°W / 46.2670; -69.2023 (East Branch Penobscot River source)) in Maine Township 7, Range 11, WELS, in Piscataquis County, the river runs 17 miles (27 km)[1] southeast through the North Maine Woods to Grand Lake Matagamon reservoir, in the northeast corner of Baxter State Park. From Grand Lake Dam, the river runs 48 miles (77 km)[1] south to its confluence with the West Branch Penobscot River in Medway, Penobscot County.

Matagamon Lake

Grand Lake Matagamon
Coordinates46°10′25″N 68°50′33″W / 46.17361°N 68.84250°W / 46.17361; -68.84250
Max. length8 mi (13 km)[2]
Surface area4,868 acres (1,970 ha)[3]
Max. depth95 feet (29 m)[4]
Water volume80,878 acre⋅ft (99,762,000 m3)[3]
Surface elevation653 ft (199 m)[5]

Grand Lake Matagamon or Matagamon Lake is a reservoir on the East Branch, impounded by Grand Lake Dam. The dam was built at the outlet of First Lake, and flooded vast expanses of low-lying land extending upstream to include Second Lake.

The shallow water habitat created by the dam is more suitable for yellow perch, fallfish, and longnose sucker rather than for trout.[4]

See also


  1. ^ a b c U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-03-29 at the Wayback Machine, accessed June 22, 2011
  2. ^ The Maine Atlas and Gazetteer (Thirteenth ed.). Freeport, Maine: DeLorme Mapping Company. 1988. pp. 51&57. ISBN 0-89933-035-5.
  3. ^ 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.
  4. ^ a b "Matagamon Lake" (PDF). Maine Department of Inland Fisheries and Game. State of Maine. Archived from the original (PDF) on 1 February 2017. Retrieved 4 May 2016.
  5. ^ U.S. Geological Survey Geographic Names Information System: Grand Lake Matagamon