|Basin countries||United States|
|Length||76 miles (122 km)|
|Source elevation||750 feet (230 m)|
|Mouth elevation||32 feet (10 m)|
|Left tributaries||East Branch Sebasticook River|
The Sebasticook River is a 76-mile-long (122 km) river in the central part of Maine, in the United States. From its source ( ) in Dexter, the upper "Main Stream" section flows generally west and south 30 miles (48 km) to Great Moose Lake. From the outlet of the lake ( ) in Hartland, the Sebasticook flows 41 miles (66 km) south to the Kennebec River in Winslow.
According to the Sebasticook Regional Land Trust:
The Sebasticook River is the largest tributary (985 square miles) to the Kennebec and thus plays an important role in the restoration of both the anadromous and resident aquatic fisheries of the Kennebec basin and the Gulf of Maine ecosystem. Due to its relatively close proximity to the lower Kennebec, large drainage area, and low gradient, this watershed historically contributed a major percentage of available spawning and nursery habitat for anadromous runs of alewife, blueback herring, American shad, rainbow smelt, and striped bass associated with the Kennebec River watershed and Gulf of Maine ecosystems. To a lesser extent, the river provided habitat for Atlantic salmon.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed June 30, 2011
- "Sebasticook River". Geographic Names Information System. United States Geological Survey. 30 September 1980. Retrieved 2013-05-20.
- "Main Stream Sebasticook River". Geographic Names Information System. United States Geological Survey. 30 September 1980. Retrieved 2013-05-20.
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