Graham Lake in Hancock County, Maine is a eutrophic reservoir formed by the construction of a hydro-electric power dam in 1922 four miles (6 km) upstream from Ellsworth, Maine.

It failed in 1923, flooding downtown Ellsworth and doing almost $8 million in property damage.

The dam has since been acquired by PPL Corporation, which continues to use it to generate electricity.

[1][3][4] Water clarity in the lake is low,[5] with secchi disk measurements averaging less than 3 meters.

Fish in the lake that are of interest to anglers include smallmouth bass, white perch, chain pickerel, landlocked salmon, and brook trout.