Sebago Lake Water Level

Portland Water District does not control the level of the lake but we do monitor it.  Sebago Lake’s water level is controlled by the headwater structure of the Eel Weir Dam Project at the outlet of the lake and the beginning of the Presumpscot River. The Eel Weir Dam was first built around 1827 and the headwater structure was later raised to its present height in 1884.

The dam is co-owned and operated by Presumpscot Hydro LLC and Dichotomy Power Maine LLC and has a Federal Energy Regulation Commission (FERC) license to do so.

The gray vertical bars on the chart represent the lake level range SAPPI must maintain the lake. The red dots represent the lake level.

To view Sebago Lake (Maine) water level data compared to historical water level information, select a year between 1989 and 2022. You may view the water levels in either graphical or tabular form.

graph | table

To view real time lake levels, visit the U.S. Geological Survey's website.