Tallest Dams in New Hampshire

New Hampshire has 663 dams with recorded heights. The tallest is Comerford at 170 feet. Taller dams impound more water and carry greater potential energy, which is why height is a key factor in hazard classification and inspection requirements.

#	Dam	County	Height (ft)	Type	Purpose	Hazard	Year
1	Comerford	Grafton	170	Concrete	Hydroelectric	High	1930
2	Moore	Grafton	149	Concrete	Hydroelectric	High	1957
3	Otter Brook Dam	Cheshire	119	Gravity	Flood Risk Reduction	High	1958
4	Franklin Falls Dam	Merrimack	116	Rockfill	Flood Risk Reduction	High	1943
5	Everett Dam	Hillsborough	115	Rockfill	Flood Risk Reduction	High	1961
6	Murphy Dam	Coos	106	Earth	Recreation	High	1938
7	Whitewater Brook Dam	Sullivan	95	Earth	Water Supply	High	1968
8	Surry Mountain Dam	Cheshire	83	Rockfill	Flood Risk Reduction	High	1941
9	Ayers Island	Grafton	80	Concrete	Hydroelectric	Significant	1924
10	Souhegan River Site 26 Dam	Hillsborough	79	Earth	Flood Risk Reduction	High	1965
11	Hopkinton Dam - Dike H-2	Merrimack	77	Earth	Flood Risk Reduction	High	1962
12	Blackwater Dam	Merrimack	75	Gravity	Flood Risk Reduction	High	1941
13	Souhegan River Site 25b Dam	Hillsborough	74	Earth	Flood Risk Reduction	High	1967
14	Hopkinton Dam	Merrimack	71	Rockfill	Flood Risk Reduction	High	1962
15	Baker River Site 2 Dam	Grafton	68	Earth	Flood Risk Reduction	High	1965
16	Baker River Site 6a Dam	Grafton	68	Earth	Flood Risk Reduction	High	1975
17	Gregg Falls	Hillsborough	66	Concrete	Hydroelectric	High	1917
18	Hopkinton Dam - Dike H-3	Merrimack	66	Earth	Flood Risk Reduction	High	1962
19	Minnewawa	Cheshire	63	Concrete	Hydroelectric	High	1923
20	Baker River Site 8 Dam	Grafton	63	Earth	Flood Risk Reduction	High	1967
21	Edward Macdowell Dam	Hillsborough	63	Earth	Flood Risk Reduction	High	1950
22	Gunnison Lake Site D2 Dam	Sullivan	62	Earth	Flood Risk Reduction	High	1983
23	Locke 2 Dam	Grafton	60	Earth	Recreation	Low	1969
24	Wilder	Grafton	59	Concrete	Hydroelectric	High	1950
25	Souhegan River Site 10a Dam	Hillsborough	59	Earth	Flood Risk Reduction	High	1966
26	Vernon	Cheshire	58	Concrete	Hydroelectric	Low	1909
27	Cascade	Coos	57	Concrete	Hydroelectric	High	1903
28	First Connecticut Lake Dam	Coos	56	Earth	Hydroelectric	High	1930
29	Balsams Mohawk River Dam	Coos	55	Earth	Recreation	Significant
30	Arlington Mills Res Wheeler Dam	Rockingham	54	Concrete	Water Supply	High	1922
31	Baker River Site 5 Dam	Grafton	53	Earth	Flood Risk Reduction	High	1967
32	Oliverian Dam	Grafton	52	Earth	Flood Risk Reduction	High	1962
33	Everett Dam - Dike P-1	Hillsborough	50	Rockfill	Flood Risk Reduction	High	1961
34	Ragged Mountain Snow Pond Dam	Merrimack	49	Earth	Fish and Wildlife Pond	Low	1988
35	Badger Brook Nh-107 Embankment Dam	Belknap	48		Fish and Wildlife Pond	Undetermined
36	Bellows Falls	Cheshire	48	Concrete	Hydroelectric	Low	1907
37	Rice Reservoir Dam	Sullivan	48	Earth	Water Supply	High	1935
38	Dead River Dam 1	Coos	47	Earth	Flood Risk Reduction	High	1970
39	Chadwick Meadows Wildlife Ref Dam	Merrimack	47	Earth	Recreation	Significant	1970
40	Wolfeboro Sewage Lagoon Dam	Carroll	45	Earth	Other	High	1975
41	Cold River Site 1 Dam	Carroll	43	Earth	Flood Risk Reduction	High	1969
42	Jackman Reservoir Dam	Hillsborough	43	Earth	Hydroelectric	High	1926
43	Eastman Falls	Merrimack	43	Concrete	Hydroelectric	Significant	1937
44	Dole Reservoir Dam	Sullivan	43	Concrete	Water Supply	High	1913
45	Abeniki Lake Dam	Coos	40	Earth	Recreation	High	1900
46	Campton Pond Hydro Dam	Grafton	39	Concrete	Hydroelectric	High	1890
47	Souhegan River Site 12a North Dike	Hillsborough	39	Earth	Flood Risk Reduction	High	1965
48	Babbidge Reservoir Dam	Cheshire	38	Earth	Water Supply	High	1931
49	Gilman	Coos	38	Concrete	Hydroelectric	Low	1898
50	Souhegan River Site 12a South Dam	Hillsborough	38	Earth	Flood Risk Reduction	High	1965

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