From the spillway of Megunticook Lake (44°14′06″N 69°05′59″W / 44.2350°N 69.0997°W / 44.2350; -69.0997 (Megunticook River source)), the river runs 3.5 miles (5.6 km)[1] southeast through the town to West Penobscot Bay.
The upper part of the river has raised water levels due to the Seabright dam.
Below the dam the river runs as a mill stream into Camden village.
In 2016 the Camden select board was alerted to low water levels above Seabright.
It is considering grouting cracks in the rocks supporting the dam to address the problem.