Flood Control Dams in New Hampshire

New Hampshire has 52 flood control dams, of which 38 carry a high hazard classification. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate.

#	Dam	County	Height (ft)	Hazard	Condition	Year
1	Otter Brook Dam	Cheshire	119	High	Not Available	1958
2	Franklin Falls Dam	Merrimack	116	High	Not Available	1943
3	Everett Dam	Hillsborough	115	High	Not Available	1961
4	Surry Mountain Dam	Cheshire	83	High	Not Available	1941
5	Souhegan River Site 26 Dam	Hillsborough	79	High	Fair	1965
6	Hopkinton Dam - Dike H-2	Merrimack	77	High	Not Available	1962
7	Blackwater Dam	Merrimack	75	High	Not Available	1941
8	Souhegan River Site 25b Dam	Hillsborough	74	High	Fair	1967
9	Hopkinton Dam	Merrimack	71	High	Not Available	1962
10	Baker River Site 2 Dam	Grafton	68	High	Fair	1965
11	Baker River Site 6a Dam	Grafton	68	High	Poor	1975
12	Hopkinton Dam - Dike H-3	Merrimack	66	High	Not Available	1962
13	Baker River Site 8 Dam	Grafton	63	High	Satisfactory	1967
14	Edward Macdowell Dam	Hillsborough	63	High	Not Available	1950
15	Gunnison Lake Site D2 Dam	Sullivan	62	High	Fair	1983
16	Souhegan River Site 10a Dam	Hillsborough	59	High	Satisfactory	1966
17	Baker River Site 5 Dam	Grafton	53	High	Poor	1967
18	Oliverian Dam	Grafton	52	High	Satisfactory	1962
19	Everett Dam - Dike P-1	Hillsborough	50	High	Not Available	1961
20	Dead River Dam 1	Coos	47	High	Fair	1970
21	Cold River Site 1 Dam	Carroll	43	High	Satisfactory	1969
22	Souhegan River Site 12a North Dike	Hillsborough	39	High	Fair	1965
23	Souhegan River Site 12a South Dam	Hillsborough	38	High	Fair	1965
24	Blackwater Dam - Little Hill Dike	Merrimack	38	High	Not Available	1941
25	Souhegan River Site 19 Dam	Hillsborough	36	High	Fair	1962
26	Souhegan River Site 35 Dam	Hillsborough	30	High	Fair	1965
27	Everett Dam - Dike P-2	Hillsborough	30	High	Not Available	1961
28	Souhegan River Site 28 Dam	Hillsborough	29	High	Satisfactory	1964
29	Souhegan Site 14 Dam	Hillsborough	28	High	Fair	1836
30	Manchester Airport Det Pond Dam	Rockingham	27	Low	Satisfactory	1992
31	Campus Drive Dam	Merrimack	26	Significant	Fair	2006
32	Souhegan Site 8 Dam	Hillsborough	25	High	Satisfactory	1977
33	Baker River Site 11 Dam	Grafton	24	High	Poor	1971
34	Baker River Site 11a Dam	Grafton	24	High	Satisfactory	1971
35	Sheep Davis Road Dam	Merrimack	24	Low	Fair	1990
36	Israel River Dam	Coos	22	Low	Unsatisfactory	1981
37	Souhegan River Site 33 Dam	Hillsborough	21	High	Fair	1971
38	Three Mile Reservoir Dam	Cheshire	20	High	Satisfactory	1986
39	Baker River Site 5 Dike	Grafton	20	Low	Satisfactory	1969
40	Blackwater Dam - Dodge Estate Dike	Merrimack	18	High	Not Available	1941
41	Eastman Treatment Lagoons Dam	Sullivan	18	Significant	Not Rated
42	Souhegan Site 8 Cemetery Dike	Hillsborough	16	Low	Satisfactory	1977
43	Pemigewasset River Levee	Grafton	15	High	Satisfactory	1960
44	Merrimack River Right Bank Fdr	Hillsborough	15	High	Fair	1949
45	Farmington Levee	Strafford	15	High	Fair	1956
46	Dead River Dike	Coos	14	Low	Fair	1970
47	Baker River Site 6 Dam	Grafton	14	Significant	Satisfactory	1969
48	Souhegan River Site 13 Dam	Hillsborough	14	Low	Satisfactory	1964
49	Souhegan River Site 15 Dam	Hillsborough	13	Significant	Fair	1963
50	Drew Lake South Weir	Hillsborough	12	Low	Not Rated
51	Riverdale Dam	Hillsborough	10	Low	Not Rated
52	Souhegan Site 8 South Dike	Hillsborough	9	Low	Satisfactory	1977

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