Lake Maranacook is located on Mill Stream, in Kennebec County in the southwest of Maine. In 1995, the construction was completed and the 2.6 square mile reservoir was owned by Carleton Woolen Mills Inc., but Cobbossee Watershed is the current owner.

Lake Maranacook’s elevation is at 210 feet and a depth of 118 feet and contains a huge variety of fish, including: brown trout, lake trout (togue), smallmouth and largemouth bass, white and yellow perch, chain pickerel, nornpout (bullhead), smelt, eel, white sucker, banded killifish, freshwater scrupling, minnows-golden shiner, pumpkinseed and redbreast sunfish.

Lake Maranacook is a recreational body of water that is surrounded by lakefront property and has vacation homes for sale and rent. On its northern tip, the reservoir is bordered by the town of Readfield and on its southern tip the town of Winthrop and is 10 miles west of Augusta, Maine. Lake Maranacook and its two distinct basins are located in the Winthrop Lakes Region, known for its excellent fishing.

The lake is managed by Maranacook Lake Association. The goal of MLA is surveying, protecting, and improving the Cobbossee Watershed District. The CWD is, today, currently involved in keeping invasive species from changing the composition of the lake. Lake Maranacook is also the secondary supply of drinking water for Winthrop.