Allagash River
| Allagash River | |
 |
|
| Country |  United States |
|---|---|
| State | Maine |
| Region | New England |
| Source | Churchill Lake |
| - elevation | 930 ft (283 m) |
| - coordinates | 46°29′33″N 69°17′17″W / 46.49250°N 69.28806°W |
| Mouth | Saint John River |
| - elevation | 591 ft (180 m) |
| - coordinates | 47°05′8″N 69°02′38″W / 47.08556°N 69.04389°WCoordinates: 47°05′8″N 69°02′38″W / 47.08556°N 69.04389°W |
| Length | 65 mi (105 km) |
| Basin | 1,479 sq mi (3,831 km2) |
| Discharge | for river mile 3, near Allagash, ME |
| - average | 1,967 cu ft/s (56 m3/s) |
| - max | 40,900 cu ft/s (1,158 m3/s) |
| - min | 87 cu ft/s (2 m3/s) |
The Allagash River is a tributary of the Saint John River, approximately 65 miles (105 km) long, in northern Maine in the United States. It drains in a remote and scenic area of wilderness in the Maine North Woods north of Mount Katahdin. The name "Allagash" comes from the Penobscot word /walakéskʸihtəkʸ/, meaning "bark stream".
The Allagash issues from Churchill Lake (formerly known as Heron Lake) at Churchill Depot in northern Piscataquis County. In its natural state, it also drained Allagash, Chamberlain, and Telos lakes, but in the 1840s dams were built which diverted their drainage into the East Branch of the Penobscot River, to facilitate the shipping of logs south to coastal Maine. Lock Dam drains some water from Chamberlain Lake into the south end of Eagle Lake, which then flows out through the Allagash as it naturally would. Extending the flowline of the Allagash River to Lock Dam on Chamberlain Lake gives a total length to the mouth of the Allagash at the Saint John River of 86 miles (138 km).
The Allagash flows generally northeast, passing through a chain of natural mountain lakes. It joins the Saint John from the south at Allagash, Maine, near the international border with New Brunswick. The relatively unspoiled nature of the river has long made it a popular destination for canoe trips. In 1857 Henry David Thoreau, along with his Concord friend Edward S. Hoar and Penobscot guide Joseph Polis, made a canoe journey which led him to the source of the river, i.e. Heron Lake. His account of the excursion called "The Allegash and East Branch" was published posthumously as the third chapter of The Maine Woods (1864).
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