High Risk Dams in New Hampshire

New Hampshire has 57 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.

Of the 162 high hazard dams in New Hampshire, 57 (35%) have concerning condition ratings — 57 rated poor and 0 rated unsatisfactory.

Dam	County	Height (ft)	Condition	Purpose	Year
Baker River Site 6a Dam	Grafton	68	Poor	Flood Risk Reduction	1975
Baker River Site 5 Dam	Grafton	53	Poor	Flood Risk Reduction	1967
Jackman Reservoir Dam	Hillsborough	43	Poor	Hydroelectric	1926
Lake Gloriette Dike	Coos	34	Poor	Recreation	1913
Weare Reservoir Dam	Hillsborough	34	Poor	Recreation	1913
Pisgah Reservoir Dam	Cheshire	33	Poor	Recreation	1870
Lake Gloriette Dam	Coos	33	Poor	Recreation	1913
Mendums Pond Dam	Rockingham	31	Poor	Recreation	1840
Goose Pond Dam	Grafton	31	Poor	Recreation	1918
Goffstown Upper Reservoir Dam	Hillsborough	31	Poor	Water Supply	1934
Kelley's Falls Dam	Hillsborough	31	Poor	Hydroelectric	1916
Pawtuckaway Lake Dollof Dam	Rockingham	28	Poor	Recreation	1842
Bowers Dam	Hillsborough	25	Poor	Water Supply	1884
Bow Lake Dam	Strafford	24	Poor	Recreation	1832
New Wilton Reservoir Dam	Hillsborough	24	Poor	Recreation	1931
Baker River Site 11 Dam	Grafton	24	Poor	Flood Risk Reduction	1971
Merrymeeting Lake Dam	Strafford	22	Poor	Recreation	1924
Rivermill Mascoma Hydro Dam	Grafton	22	Poor	Hydroelectric	1920
Jones Dam	Strafford	21	Poor	Recreation	1924
Pittsfield Mill Dam	Merrimack	21	Poor	Recreation	1920
Millville Lake Dam	Rockingham	20	Poor	Recreation	1917
Walpole Reservoir Dam	Cheshire	20	Poor	Water Supply	1901
Dells Pond Outlet Dam	Grafton	20	Poor	Recreation	1935
Sawyer Lake Dam	Belknap	19	Poor	Recreation	1916
Milton Three Ponds Dam	Strafford	19	Poor	Recreation	1824
Cheshire Mills Lower Dam	Cheshire	18	Poor	Hydroelectric	1848
Mascoma Lake Dam	Grafton	18	Poor	Recreation	1881
Upper Wilson Pond Dam	Cheshire	17	Poor	Recreation	1910
Sargent Lake Dam	Belknap	17	Poor	Recreation	1870
Sunset Lake Dam	Belknap	17	Poor	Recreation	1860
Crystal Lake Dam	Belknap	16	Poor	Recreation	1958
Barnstead Parade Dam	Belknap	16	Poor	Recreation	1830
Stratford Bog Pond Dam	Coos	16	Poor	Recreation	1934
Suncook Lake Dam	Belknap	16	Poor	Recreation	1882
Alton Power Dam	Belknap	16	Poor	Recreation	1923
Grist Mill Pond Dam	Grafton	16	Poor	Hydroelectric	1924
Pickpocket Dam	Rockingham	15	Poor	Recreation	1920
Exeter Reservoir Dam	Rockingham	15	Poor	Water Supply	1886
Great East Lake Dam	Carroll	15	Poor	Recreation	1825
Loon Lake Dam	Sullivan	15	Poor	Recreation	1920
Lake Waukewan Dam	Belknap	15	Poor	Recreation	1880
Horn Pond Dam	Carroll	14	Poor	Recreation	1930
Beech River Mill Dam	Carroll	14	Poor	Hydroelectric	1851
Warren Lake Dam	Cheshire	13	Poor	Recreation	1771
Lower Damon Reservoir Dam	Cheshire	13	Poor	Recreation	1832
Ashuelot Pond Dam	Sullivan	13	Poor	Recreation	1872
Purity Lake Dam	Carroll	13	Poor	Recreation	1750
Northwood Lake Dam	Merrimack	13	Poor	Recreation	1926
Gregg Lake Dam	Hillsborough	12	Poor	Recreation	1908
Newfound Lake Dam	Grafton	12	Poor	Recreation	1840
Lovell Lake Dam	Carroll	12	Poor	Recreation	1910
Highland Lake Dam	Cheshire	11	Poor	Recreation	1911
Gumpas Pond Dam	Hillsborough	10	Poor	Recreation	1900
Upper Kimball Pond Dam	Carroll	10	Poor	Recreation	1800
Penacook Lake Dam	Merrimack	9	Poor	Water Supply	1873
Dorrs Pond Dam	Hillsborough	9	Poor	Recreation	1934
Pierce Pond Dam	Hillsborough	8	Poor	Recreation	1700

← All dams in New Hampshire · High risk dams nationwide