Largest Reservoirs in Maine

Maine has 564 dams with recorded storage capacity. The largest is Moosehead - West Outlet with 1,080,000 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	Moosehead - West Outlet	Somerset	1,080,000	20	Hydroelectric	1835
2	Moosehead - East Outlet	Somerset	1,080,000	26	Hydroelectric	1835
3	Ripogenus	Piscataquis	688,000	83	Hydroelectric	1916
4	Nicatous Stream	Hancock	371,503	8	Recreation	1974
5	North Twin - Dike 4	Penobscot	346,000	11	Hydroelectric	1934
6	North Twin - Dike 2	Penobscot	346,000	11	Hydroelectric	1934
7	North Twin - Dike 5	Penobscot	346,000	11	Hydroelectric	1934
8	North Twin - Dike 1	Penobscot	346,000	11	Hydroelectric	1934
9	North Twin - Dike 3	Penobscot	346,000	15	Hydroelectric	1934
10	North Twin	Penobscot	346,000	35	Hydroelectric	1934
11	North Twin - Dike 6	Piscataquis	346,000	13	Hydroelectric	1934
12	Eel Weir	Cumberland	330,000	22	Hydroelectric	1879
13	Aziscohos	Oxford	321,195	74	Hydroelectric	1911
14	Abbott Brook Dike	Oxford	321,195	27	Hydroelectric	1911
15	Flagstaff	Somerset	275,482	45	Hydroelectric	1948
16	Vanceboro	Washington	214,470	21	Hydroelectric	1967
17	Wyman	Somerset	208,910	155	Hydroelectric	1930
18	Brassua	Somerset	206,000	50	Hydroelectric	1927
19	Upper Dam	Oxford	192,039	25	Hydroelectric	1883
20	Farm Cove	Washington	160,900	15	Hydroelectric	1879
21	West Grand Lake	Washington	160,900	13	Hydroelectric	1836
22	Grand Falls		149,600	50	Hydroelectric	1915
23	Damariscotta - Intake Dam	Lincoln	142,529	15	Hydroelectric	1920
24	Damariscotta - Waste Gate Dam	Lincoln	142,529	10	Hydroelectric	1920
25	Middle Dam	Oxford	130,738	22	Hydroelectric	1883
26	Graham Lake Dam	Hancock	130,000	43	Hydroelectric	1924
27	Graham Lake Flood Control	Hancock	130,000	58	Hydroelectric	1994
28	Sysladobsis Lake	Washington	123,555	9	Hydroelectric	1861
29	Seboomook Lake	Somerset	117,080	60	Hydroelectric	1936
30	Messalonskee Lake	Kennebec	110,000	14	Hydroelectric	1992
31	Green Lake	Hancock	107,000	8	Hydroelectric	1911
32	Forest City	Washington	105,300	12	Hydroelectric	1949
33	Lock	Piscataquis	105,200	15	Hydroelectric	1875
34	Telos	Piscataquis	105,200	20	Hydroelectric	1890
35	Churchill	Piscataquis	99,000	20	Hydroelectric	1968
36	Danforth	Washington	93,952	16	Water Supply	1845
37	Indian Pond - East Dike	Somerset	78,000	15	Hydroelectric	1955
38	Indian Pond - West Dike	Somerset	78,000	10	Hydroelectric	1955
39	Indian Pond	Somerset	78,000	175	Hydroelectric	1955
40	Cobbosseecontee Outlet	Kennebec	67,000	14	Other	1900
41	Sebec	Piscataquis	60,330	15	Hydroelectric	1984
42	Cherryfield	Washington	59,940	25	Flood Risk Reduction	1965
43	Scopan	Aroostook	59,300	35	Hydroelectric	1928
44	Gulf Island	Androscoggin	55,100	99	Hydroelectric	1926
45	Grand Lake (matagamon)	Penobscot	45,800	25	Hydroelectric	1941
46	Millinocket Lake	Penobscot	45,370	20	Hydroelectric	1910
47	Great Pond	Kennebec	43,900	14	Fire Protection, Stock, Or Small Fish Pond	1900
48	Caucomgomoc Lake	Piscataquis	42,516	16	Hydroelectric	1981
49	Dolby	Penobscot	41,956	66	Hydroelectric	1906
50	Rangeley	Franklin	39,194	17	Hydroelectric	1836

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