Reservoir report

New-Hampshire reservoirs & dams

Every documented dam and reservoir in New-Hampshire — with normal storage capacity, dam height, max discharge, hazard classification, and drainage area. Sourced from USACE NID and state water-resource agencies.

Dams in New-Hampshire

653

Total storage

1,406,271ac·ft

High-hazard dams

159

Updated

May 16

Open the New-Hampshire reservoir layer on the map Every dam and reservoir filtered to New-Hampshire on the interactive map.

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May

2026

Reservoir report

New Hampshire has several reservoirs and dams that serve as important sources of water supply for various purposes like hydroelectric power generation, irrigation, and recreation. Some of the major reservoirs in the state include Lake Winnipesaukee, Squam Lake, Newfound Lake, and Lake Winnisquam. These reservoirs are fed by several streams, rivers, and creeks including the Merrimack River, Pemigewasset River, and Winnipesaukee River. The snowpack from the White Mountains is a crucial source of water for these reservoirs. In recent years, New Hampshire has experienced drought conditions, leading to record low levels in some reservoirs. Seasonal trends in the area show that spring is usually the wettest season, and winter snowfall contributes significantly to the water supply. The hydrology in the area is highly dynamic and influenced by several factors like precipitation, temperature, and topography. To ensure sustainable water management, New Hampshire has implemented various policies and regulations to protect its water resources.

New-Hampshire at a glance

Storage, hazard, and history

How the New-Hampshire dam inventory breaks down -- aggregate stats computed across every documented dam in the state.

Hazard classification

High159
Significant176
Low300
Unknown18

USACE downstream-consequence rating, not failure likelihood.

Notable dams

Tallest Comerford 170 ft
Oldest Purity Lake Dam 1750
Total storage All New-Hampshire dams 1,406,271 ac·ft

Built by decade

Most U.S. dams were built mid-20th century during the federal water-development era.

Full inventory

New-Hampshire dams & reservoirs

Every documented dam in New-Hampshire. Sortable by any column; quickly filterable by name. Numeric columns heat-mapped from light to deep based on value. Tap any dam for the full report.

Name	Year built	Normal storage	Dam height	Max discharge	Hazard	Drainage area
Blackwater Dam	1941	0	75	42,800	High	128
Blackwater Dam - Dodge Estate Dike	1941	0	18	42,800	High	128
Blackwater Dam - Little Hill Dike	1941	0	38	42,800	High	128
Everett Dam	1961	1,000	110	28,500	High	64
Everett Dam - Dike 1	1961	1,000	50	28,500	High	64
Everett Dam - Dike 2	1961	1,000	30	28,500	High	64
Franklin Falls Dam	1943	3,000	116	205,000	High	1,000
Hopkinton Dam	1962	700	71	59,700	High	382
Hopkinton Dam - Dike H-2	1962	700	77	58,000	High	382
Hopkinton Dam - Dike H-3	1962	700	66	58,000	High	382
Edward Macdowell Dam	1950	150	63	17,800	High	44
Otter Brook Dam	1958	870	119	34,500	High	47
Surry Mountain Dam	1941	1,320	83	50,000	High	100
Warren Lake Dam	1771	501	10	395	Significant	5
Vilas Pool Dam	1925	45	31	4,002	Significant	61
Sunset Lake Dam	1860	1,400	17	1,390	High	7
Alton Power Dam	1923	1,235	16	3,900	High	35
Suncook Lake Dam	1882	4,500	16	3,310	High	55
Dodge Falls	1905	4,940	18	47,000	Low	2,215
Lochmere	1910	20,800	11	2,400	Low	428
Sawyer Lake Dam	1916	760	19	2,200	High	2
Rollins Pond Dam	1800	200	17	150	Low	2
Crystal Lake Dam	1958	1,400	16	2,562	High	27
Spoons Pond Dam	1966	50	20	458	Low	1
Hadley Falls	1922	150	20	6,620	Significant	197
Uncanoonuc Lake Dam	1936	211	10	66	High	0
Gorham	1958	258	20	43,000	Low	1,431
China Mill Dam	1917	22	29	16,770	High	259
Kilton Pond Dam	·	196	12	2,583	Low	7
Taylor Reservoir Dam	1918	80	21	1,775	Significant	18
Arlington Mill Res Evergreen Dike	1922	3,360	31	9,344	Significant	21
Arlington Mills Res Wheeler Dam	1922	3,360	54	9,344	High	21
Arlington Mills Res West Dike	1922	3,360	10	0	Low	21
Millville Lake Dam	1917	504	20	1,900	High	10
Canobie Lake Dam	1930	700	8	50	Low	2
Hermit Lake Dam	1927	1,233	20	3,343	Low	6
Bradley Lake Dam	1952	1,300	19	1,408	Significant	4
Highland Lake Dam	1935	440	10	670	Significant	5
Morey Pond Dam	·	30	12	332	Low	1
Steels Pond	1909	190	14	4,300	Significant	60
Eastman Lake Dam	1972	2,100	35	4,300	High	8
Otis Falls	1982	64	27	2,450	Low	30
Spectacle Pond Dam	1915	115	7	476	High	0
Hunts Pond Dam	1908	126	8	103	Low	1
Lower Reservoir Dam	1893	438	33	325	High	2
Upper Reservoir Dam	1924	321	30	510	High	1
Storrs Pond Dam	1934	148	34	1,305	Significant	3
Hanover Center Reservoir Dam	1962	257	30	2,380	High	2
Shelburne	1906	960	17	23,000	Low	1,494
Morgan Pond Dam	1939	146	12	115	Low	1
Highland Lake Dam	1911	1,500	11	2,060	High	30
Bow Lake Dam	1832	17,276	24	1,009	High	14
Gregg Lake Dam	1908	1,000	12	1,030	High	4
Campbell Pond Dam	1937	27	7	74	Undetermined	0
Willard Pond Dam	1937	277	8	81	Low	2
Squam Lake	1856	39,600	17	1,470	Significant	58
Grist Mill Pond Dam	1924	125	16	1,755	High	59
Ammonoosuc River	1900	280	17	40,000	Low	395
Silver Lake Dam	1924	2,870	12	228	Low	2
Chesham Pond Dam	1921	412	16	720	High	9
Russell Reservoir Dam	1923	76	12	1,450	Low	11
Harrisville Pond Dam	1886	2,000	21	337	High	10
Skatutakee Lake Dam	1937	478	13	250	Significant	15
Cheshire Mills Forebay Dam	1886	1	29	635	High	11
Woodsville	1827	124	23	18,500	Significant	420
Hoague - Sprague	1906	26	14	19,562	Significant	427
Cheshire	1939	342	13	2,300	Low	36
Smith Pond Dam	1947	463	12	148	High	1
Stratford Bog Pond Dam	1934	79	16	1,308	High	6
Otter Pond Dam	1935	277	8	445	Low	16
Rodgers Pond Dam	1922	9	14	610	Low	2
Uncanoonuc Lake Dike	1954	90	15	0	High	0
Cascade Brook Dam	1955	6	11	3,230	Low	8
Pillsbury Lake Dam	1964	243	13	640	Low	13
Winnipocket Lake Dam	1944	1,500	7	30	Low	3
Sargent Lake Dam	1870	178	17	2,538	High	3
Cross Power	1903	120	25	24,000	High	1,350
Sawmill	1965	620	15	33,000	Low	1,338
Garvins Falls	1901	7,200	18	113,000	Low	2,427
Mud Pond Dam	1918	360	18	0	Low	13
Gregg Falls	1917	3,650	66	40,000	High	200
Seaver Reservoir Dam	1924	309	30	3,544	High	4
Howe Reservoir Dam	1924	1,610	28	1,941	High	11
Childs Bog Dam	1924	508	17	3,735	High	2
Vernon	1909	18,300	58	224,700	Low	6,266
Contoocook Lake Dam	1885	1,548	7	1,256	Low	16
Mountain Brook Reservoir Dam	1948	200	18	3,420	Significant	14
Ashuelot River Dam	1919	120	16	5,500	Low	113
Goose Pond Dam	1868	344	22	1,174	High	2
Amoskeag	1921	4,320	29	87,000	High	2,854
Massabesic Lake Dam	1873	2,694	27	4,820	High	47
Minnewawa	1923	155	63	1,700	High	23
Berry Pond Dam	1884	185	18	377	High	0
Whites Pond Dam And Dike	1890	171	15	1,502	High	2
Whittemore Lake Dam	1886	108	11	639	Low	2
Lake Sunapee Dam	1932	19,800	14	600	Significant	45
Pine River Pond Dam	·	2,400	14	2,495	Significant	13
Great East Lake Dam	1825	19,600	15	1,646	High	16
Bellows Falls	1907	30,000	48	157,600	Low	5,414
Rust Pond Dam	·	442	8	283	Significant	3
Weare Reservoir Dam	1913	6,300	34	12,600	High	29
Mine Falls	1889	1,970	16	8,981	Low	405
Nippo Pond Dam	1935	174	9	8	Low	1
Goose Pond Dam	1918	4,691	31	6,300	High	16
Grafton Pond Dam	1918	4,700	21	0	Low	4
Pittsfield Mill Dam	1920	112	21	6,290	High	131
Jackson Mills	1920	150	33	36,795	Significant	529
Harris Pond Dam	1870	1,190	35	5,414	High	25
Supply Pond Dam	1870	171	28	0	High	25
Wickwas Lake Dam	1937	457	7	322	Low	8
Lake Kanasatka Dam	1933	1,620	17	703	Significant	7
Lower Great Falls	1984	472	36	8,460	Significant	220
Somersworth	1929	377	17	8,000	Significant	218
Canaan	1927	120	19	37,000	Low	381
Mendums Pond Dam	1840	1,960	31	1,890	High	7
Pawtuckaway Lake Dollof Dam	1842	11,500	28	3,200	High	21
Pawtuckaway Lake/Gove Dike	1842	11,500	9	0	Significant	21
Pawtuckaway Lake /Drowns Dam	1842	11,500	18	2,200	Significant	21
Newfound Lake Dam	1840	27,500	12	8,760	High	95
Lower Valley	1921	24	33	7,172	Significant	252
Sweetwater	1922	150	36	10,668	Significant	270
Rice Reservoir Dam	1935	117	48	237	High	0
Dole Reservoir Dam	1913	123	43	160	High	0
Lower Lisbon	1986	96	18	1,200	Low	288
Dells Pond Outlet Dam	1935	50	20	735	High	4
Dodge Pond Dam	1936	150	13	752	Low	4
Brooklyn	1919	50	19	12,500	Low	254
Upper Kimball Pond Dam	1800	570	10	1,750	High	8
Rochester Reservoir Dam	1935	663	26	419	High	0
Mascoma Lake Dam	1881	8,332	18	17,255	High	153
Rivermill Hydro Dam	1925	170	22	0	High	188
J. Brodie Smith	1948	60	31	56,000	High	1,372
Riverside	1970	60	21	37,800	Low	1,338
Glen Road	1988	10	16	8,970	Significant	194
Ayers Island	1924	10,000	80	92,100	Significant	746
Errol	1887	80,000	25	19,700	Low	1,045
Ayers Pond Dam	1810	1,059	18	212	Significant	2
Cascade	1903	200	57	40,000	High	1,361
Eastman Falls	1937	9,340	43	75,000	Significant	1,003
Comerford	1930	32,270	170	297,000	High	1,635
Mcindoes	1931	4,800	25	138,500	Low	2,200
Woodbury Estate Pond Dam	1935	7	16	1,100	Significant	6
Lake Gloriette Dike	1913	300	34	0	High	2
Ayers Pond Dam	1865	28	16	488	Low	6
North Village Dam	1836	70	12	3,060	Low	125
Lake Gloriette Dam	1913	300	33	1,226	High	2
Lake Twotowns Dam	1936	15	25	80	Low	0
Abeniki Lake Dam	1900	19	40	7,000	High	1
Burton Pond Dam	1837	300	14	0	Low	0
Giles Pond	1904	860	18	1,800	Low	25
Baker River Site 8 Dam	1967	143	63	17,315	High	16
Pleasant Lake Dam	1921	552	7	94	Low	4
Island Pond Dam	1934	158	7	1,142	Undetermined	31
Sanborn Pond Grist Mill Dam	1830	470	16	645	High	5
Ballard Pond Mill Dam	1941	39	21	1,348	Significant	4
Ballard Pond Upper Dam	1941	127	7	514	Low	4
Murphy Dam	1938	99,500	106	74,000	High	171
First Connecticut Lake Dam	1930	91,000	56	20,600	High	82
Second Connecticut Lake Dam	1935	11,650	28	0	Low	45
Washburn Corners Dam	1957	613	14	2,430	Low	12
Upper Mountain Lake Dam	1963	325	31	1,640	Low	3
Gorham	1904	370	24	47,500	Low	1,384
Bog Brook Pond Dam	1957	65	18	423	Low	1
Lower Mountain Lake Dam	1967	191	33	1,650	Significant	4
Hidden Pond Dam	1966	75	16	531	Low	1
Pioneer Lake Dam	1971	194	17	1,000	Low	1
Jackman Reservoir Dam	1926	8,360	43	17,700	High	63
Beaver Brook Assoc Wldlife Pond Dam	1968	60	12	575	Low	2
Wildlife Pond Dam	1970	80	12	921	Significant	0
Upper Wilson Pond Dam	1925	50	17	0	High	0
Hopkinton	1890	380	10	7,000	Low	437
Swanzey Lake Dam	1920	348	12	545	Low	2
Lower Wilson Pond Dam	1930	250	18	197	Significant	2
Souhegan River Site 26 Dam	1965	28	79	12,544	High	5
Kimball Lake Dam	1930	58	7	583	Low	1
Souhegan River Site 12a South	1965	690	38	8,483	High	5
Lower Beech Pond Dam	1860	1,440	10	747	Low	3
Lakeport	1958	165,800	10	4,080	Significant	363
Copps Pond Dam	1944	576	16	690	Significant	4
Tower Hill Pond Dam	1938	3,960	35	7,884	High	13
Union Meadows Dam	1935	690	10	1,374	Significant	31
Lovell Lake Dam	1918	1,750	12	1,730	High	5
Belleau Lake Dam	1962	875	16	472	Significant	6
Horn Pond Dam	1935	2,751	14	2,516	High	23
Clark Pond East Dam	1811	80	8	1,677	Low	15
Clark Pond West Dam	1811	80	9	1,677	Low	15
Barnstead Parade Dam	1920	270	16	8,645	High	114
Mill Pond Dam	1937	45	16	550	Significant	1
Baker River Site 2 Dam	1965	500	68	439	High	6
Swains Lake Dam	1890	1,798	17	357	High	3
May Pond Dam	1830	465	14	1,071	Significant	7
Island Pond Dam	1861	2,910	13	185	Low	2
Millen Lake Dam	1970	463	23	266	Significant	1
Ashuelot Pond Dam	1872	2,760	13	1,610	Significant	26
Hooksett	1927	1,650	11	78,500	Low	2,805
Robb Reservoir Dam	1953	224	13	1,674	Low	9
Daniels Lake Dam	1961	116	12	859	Low	6
Baker River Site 6 Dam	1969	210	13	0	Significant	17
Baker River Site 5 Dam	1967	39	53	4,290	High	4
Baker River Site 11a Dam	1971	9	24	0	High	1
Powder Mill	1924	2,400	21	18,200	Low	184
Monadnock	1923	217	22	13,400	Low	190
Pierce	1921	33	12	13,400	Low	191
Paper Mill Dam	1922	25	13	0	Low	191
Burns Lake Dam	1921	401	13	752	Low	5
Airport Marsh Dam	1955	166	11	2,400	Low	14
Chase Pond Dam	1939	190	17	0	Significant	14
Huckins Mill Pond Dam	1947	23	10	1,670	Low	10
Tannery Pond Dam	1850	48	12	1,100	Low	15
Hillsborough Mill	1925	70	22	13,100	Significant	97
Wilder	1950	55,000	59	302,000	High	3,375
New Wilton Reservoir Dam	1933	240	24	127	Significant	0
Souhegan River Site 15 Dam	1963	74	13	0	Significant	1
Souhegan River Site 10a Dam	1966	49	59	5,600	High	6
Souhegan River Site 33 Dam	1971	24	21	2,100	High	1
Long Pond Dam	1933	250	12	1,650	Significant	2
Exeter Reservoir Dam	1886	79	15	1,245	High	1
Oliverian Dam	1962	164	52	35,700	High	11
Crystal Lake Dam	1918	2,135	22	2,404	Significant	13
Long Pond Dam	1922	238	10	895	Low	1
Cold Brook Pond Dam	1956	61	19	2,175	Significant	1
Baltic Mills Dam	1919	105	21	0	Low	130
Ashuelot Paper Mill Dam	1910	38	18	14,870	Low	412
Richardson Brook Pond Dam	1968	25	12	0	Low	1
Lower Robertson	1905	100	18	10,200	Low	406
Bethlehem Dam	1926	22	29	17,080	Low	97
Deering Reservoir Dam	1940	2,730	25	3,839	High	4
Hermit Hill Farm Pond Dam	1975	64	13	475	Low	1
Purity Lake Dam	1750	162	13	240	High	7
Northwood Lake Dam	1926	2,100	13	1,629	High	23
Bowker Pond Dam	1859	238	14	358	Significant	1
Silver Lake Dam	1926	3,000	8	1,345	Low	22
Todd Lake Dam	1858	336	17	2,277	Significant	19
Kimball Pond Dam	1937	119	8	1,144	Low	6
Pine Island Pond Dam	1936	243	19	5,630	Low	70
Exeter River Dam	1927	72	15	0	Significant	61
Pickpocket Dam	1920	75	15	5,250	High	86
Forest Lake Dam	1925	164	8	175	Low	7
Kilburn Pond Dam	1935	132	15	2,918	Low	0
Kelley's Falls	1916	1,350	24	24,100	High	214
Pisgah Reservoir Dam	1870	660	33	1,933	High	2
Stone Pond Mill Outlet Dam	1920	75	7	0	Low	1
Village Pond Dam	1922	225	12	0	Low	35
Sand Pond Dam	1925	212	12	127	Low	1
Lake Waukewan Dam	1880	12,510	15	224	High	13
Black Pond Dam	1926	282	10	364	Low	4
Meredith Reservoir Dam	1934	15	25	170	Low	0
Crescent Lake Dam	1854	12,700	15	1,880	High	36
Sunrise Lake Dam	1877	2,120	19	1,205	High	4
Beaver Pond	1927	50	14	·	Low	·
Goldman Dam	1935	18	12	7,364	Low	138
Berry Brook Reservoir Dam	1930	200	28	1,633	Low	4
Osgood Pond Dam	1861	57	9	580	Low	5
Milton Leather Board Dam	1904	60	32	0	Significant	116
Mirror Lake Dam	1836	136	12	215	High	0
Conway Lake Dam	1936	7,300	17	0	Significant	23
Milton Three Ponds Dam	1824	12,500	19	8,475	High	107
Pequawket Pond Dam	·	700	15	4,600	Low	27
Rowe Dam	1935	224	15	1,137	Low	30
Rockwood Pond Dam	1922	244	11	1,246	Low	1
Tyler Tree Farm Dam	1969	16	25	1,580	Significant	3
Campton Bog Pond Dam	1923	43	10	0	Low	8
Holt Pond Dam	1890	61	13	1,411	Low	22
Ossipee Lake Dam Headworks Dam	1919	23,300	12	2,720	Low	357
Bowers Dam	1884	761	25	5,138	High	23
Lyford Pond Dam	1840	95	15	31	Significant	0
Salmon Brook I Dam	1887	79	17	825	Low	21
Hawkins Pond Dam	1873	350	12	243	Significant	2
Granite Lake Dam	1932	765	11	0	High	4
Harantis Lake Dam	1935	45	14	220	Low	2
Spoonwood Pond Dam	1855	500	12	96	Low	2
Nubanusit Lake Dam	1861	4,600	16	992	Significant	6
Merrymeeting Lake Dam	1924	12,410	22	800	High	11
Whitewater Brook Dam	1968	525	95	9,695	High	4
Jones Dam	1924	280	21	2,844	High	16
Downing Pond Dam	1921	200	15	0	Low	18
Washburn Mill Dam	·	1	25	7,331	Undetermined	25
York	1967	150	10	14,150	Low	760
Rolfe Canal Gate Structure Dam	1963	600	17	3,000	Low	760
Marchs Pond Dam	1840	365	8	727	High	1
Club Pond Dam	1939	90	9	415	Low	3
Penacook Upper Falls	1987	71	23	35,000	Low	766
Kingswood Lake Dam	1900	594	10	692	Low	2
Harris Brook Reservoir Dam	1903	132	22	919	Significant	2
Waterloom Falls	1980	663	18	1,270	Low	23
Spofford Lake Dam	1919	6,030	11	550	Significant	4
Mountain Pond Dam	·	59	13	348	Low	1
Goose Pond Dam	1920	55	12	90	Low	9
Penacook Lake Dam	1873	1,515	9	615	High	4
Turkey Pond Dam	1958	765	15	5,710	High	29
Pleasant Lake Dam	1850	6,445	13	1,798	High	11
Red Leaf Pond Dam	1892	114	8	236	Low	2
Turtle Pond Dam	1939	201	8	427	Low	5
Macallen Dam	1887	480	27	6,720	High	211
Gilman	1898	705	38	3,538	Low	1,514
Knowles Pond Dam	1935	182	11	76	Low	0
Mill Pond Dam	1935	22	13	710	Low	3
Weston	1987	275	20	14,250	Low	263
Gulch Mountain Pond Dam	1965	25	15	1,647	Significant	0
North River Pond Dam	·	140	8	1,435	Low	1
Lower Trio Pond Dam	1936	182	11	367	Low	2
Allied Leather Forebay	1982	54	15	10,682	Low	766
Phillips Pond Dam	1926	117	15	445	Low	3
Big Dan Hole Pond Dam	1910	1,200	13	498	Significant	6
Pembroke	1891	34	26	1,848	Low	259
Webster	1917	147	22	11,010	Significant	259
Robbins Pond Dam	1918	180	10	0	Low	4
Lower Damon Reservoir Dam	1832	163	13	1,020	High	12
Damon Upper Reservoir Dam	1835	270	14	4,879	High	11
Pearly Pond Dam	1935	500	7	300	Low	3
Island Pond Dam	1920	145	17	565	High	2
Mill Pond Dam	1880	39	20	574	Low	2
Hubbard Pond Dam & Dike	1836	318	8	561	Significant	4
Gonic Sawmill Pond Dam	1935	25	25	0	Low	80
Gonic Dam	1935	60	16	0	Significant	78
Upper City Dam	1920	250	14	8,128	Significant	64
Spaulding Pond Dam	1899	700	19	9,900	Low	118
Baxter Lake East Dike	1923	2,190	10	0	Low	4
Loch Lyndon Reservoir Dam	1901	360	12	130	Low	2
Baxter Lake Center Dike	1923	2,190	10	0	Low	4
Baxter Lake Main Dam	1923	2,190	19	1,156	Significant	4
South Berwick	1923	641	18	14,747	Low	235
Rollinsford	1910	456	20	7,000	Significant	230
Woodward Pond Dam	1836	982	17	268	High	2
Babbidge Reservoir Dam	1931	450	38	1,800	High	5
Stinson Lake Dam	1955	454	8	3,023	Low	8
Bog Pond Dam	1948	600	17	2,950	Significant	7
Thorndike Pond Dam	1915	1,460	13	853	Low	4
Scott Pond Dam	1918	470	10	747	Significant	6
Webster Lake Dam	1873	1,100	14	5,557	High	19
Miller Pond Dam	1800	114	7	11	Undetermined	2
Fiske Mill Hydro Dam	1922	50	20	0	Low	421
Pratt Pond Dam	1935	90	6	0	Low	1
Moore	1957	223,722	149	211,300	High	1,600
Star Lake Dam	1920	120	7	42	Low	2
Grassy Pond Dam	1920	79	9	565	Low	1
Crowcroft Pond Dam	1939	152	10	457	Low	2
Sportsman Pond Dam	1942	450	15	810	Low	10
Larrys Pond Dam	1970	70	19	340	Low	1
Stone Pond Dam	1922	48	16	600	Low	11
Noone Mills	1938	135	14	8,800	Significant	6
Souhegan River Site 28 Dam	1964	6	29	2,521	High	1
Nashua Canal Dam	1886	155	11	2,680	Low	1
Pratt Pond Iii Dike	1935	90	9	0	Low	1
Souhegan River Site 13 Dam	1964	14	14	1,850	Low	1
Souhegan Site 14 Dam	1836	23	28	4,700	High	2
Souhegan River Site 19 Dam	1962	85	36	16,463	High	11
Souhegan River Site 35 Dam	1965	37	30	9,135	High	6
Beaver Brook Dam	1929	67	7	1,572	Low	11
Wason Pond Dam	1931	38	18	0	Low	3
Onway Lake Dam	1915	305	9	352	Low	8
Deer Pond Dam	1963	100	12	1,362	Low	1
Powwow Pond Dam	1940	1,472	12	0	Significant	29
Wiswall Dam	1911	134	22	12,630	Significant	182
Boston Felt	1983	232	10	10,500	Low	140
Catamount Pond Dam	1938	57	14	1,160	Low	17
Shellcamp Pond Dam	1920	465	12	323	Low	3
Robinhoodpark Reservoir Dam	1872	46	18	1,225	High	0
Meetinghouse Pond Dam	1942	58	7	237	Low	1
Cranberry Pond Dam	1925	55	10	202	Low	1
Cold Spring Pond Dam	1950	270	9	41	Low	0
Dudley Pond Dam	·	80	13	700	Low	3
East Inlet Dam	1900	243	13	2,456	Low	13
Scott Bog Pond Dam	1942	203	9	954	Low	3
Moose Falls Dam	1950	58	10	1,300	Significant	7
Big Brook Bog Dam	1946	107	11	991	Significant	3
Mud Pond Dam	1940	110	10	90	Low	2
Baker Brook Pond Dam	1974	53	10	25	Significant	2
Lake Armington Dam	1900	549	9	1,900	Significant	3
Reservoir Pond Dam	1900	469	12	86	Low	4
Cummins Pond Dam	1880	691	10	724	Low	5
White Oak Pond Dam	1979	684	8	222	Low	5
Mountain Pond North Dam	1913	100	14	168	Low	0
Avery	1947	3,700	13	5,960	Low	374
Fountain Pond Center Dam	1800	53	14	198	Low	0
Runaway Pond East Dam	1814	77	15	177	Low	0
Big Island Pond Walter Stickney Dam	1905	2,750	10	809	Significant	16
Bellamy Reservoir Dam	1962	1,665	35	19,674	High	21
Freeses Pond Dam	1987	192	13	2,460	Low	9
Dead River Dam 1	1970	1,240	47	8,100	High	6
Souhegan Site 8 Dam	1977	180	25	7,030	High	5
Site 19 Souhegan	1963	85	35	18,577	High	11
Souhegan River Site 25b Dam	1967	38	74	15,800	High	5
Baker River Site 6a Dam	1975	326	68	1,900	High	4
Baker River Site 11 Dam	1971	8	24	607	High	1
Cold River Site 1 Dam	1969	110	43	8,870	High	3
Lower Ipc Dam	1934	20	16	0	Significant	96
Perkins Pond Marsh Dam	1924	711	15	917	Low	4
Lower St Pauls School Pond Dam	1835	31	14	1,957	Low	31
Freestyle Farm Pond Dam	1962	272	12	569	Low	1
Putney Meadow Pond Dam	1800	41	8	0	Low	1
Drew Lake South Weir	·	0	12	0	Low	426
Stark Pond Dam	1760	55	12	1,617	Low	5
Goffstown Upper Reservoir Dam	1930	65	31	660	High	1
Goffstown Lower Reservoir Dam	1937	20	30	1,430	High	1
Otter Brook Dam	1928	59	10	0	Low	9
Black Reservoir Dam	1850	109	10	580	Significant	6
Peterbourgh Treatment Lagoon Dam	1972	65	9	0	Significant	0
Bear Pond Dam	1932	165	8	0	Low	1
Farrar Marsh Dam	1978	154	11	1,565	Significant	6
Dunklee Pond Dam	1986	72	9	206	Low	2
Stump Pond Dam	1938	47	16	860	Low	2
Hoods Pond Dam	1945	42	27	2,400	High	6
Kendall Pond Dam	1934	19	12	2,750	Low	27
Little Cohas Brook Dam	1953	39	10	1,011	Low	7
Dube Pond Dam	1966	200	8	800	Significant	6
Goldfish Pond Dam	1974	11	16	302	Low	1
Hall Mountain Marsh Dam	1950	71	13	553	Low	0
Hayes Marsh Dam	1951	93	10	243	Low	1
Dorrs Pond Dam	1934	60	9	795	High	2
Meadow Lake Dam	1975	85	14	192	Low	0
Nottingham Lake Dam	·	115	14	3,098	Low	15
New Pond Dam	1885	107	13	30	Low	1
Gillan Pond Dam	1971	33	10	0	Low	5
Gumpas Pond Dam	1900	185	10	133	High	2
Dole Marsh Dam	1976	50	8	211	Low	1
George Pond Dam	1911	222	10	443	High	5
Big Dodge Pond Dam	1935	19	12	800	Significant	7
Taylor River Pond Dam	1949	133	19	2,023	High	11
Exeter Sewage Holding Pond Dam	1989	21	10	0	Significant	0
South Mill Pond Dam	1983	18	14	1,760	Low	0
Upper Peverly Pond Dam	1935	60	11	82	Low	1
Taylor River Pond Dam	1935	21	14	2,165	Undetermined	10
Salmon Brook Dam	1965	100	28	0	Low	32
Wolfeboro Sewage Lagoon Dam	1975	273	45	306	High	0
Bancroft Reservoir Dam	1935	144	15	200	Low	0
Mill Pond Dam	1935	58	10	1,360	Low	20
Fullam Pond Dam	·	104	18	1,271	Low	7
Cocheco Falls	1930	110	9	6,000	Significant	187
Watson	1900	236	12	9,170	Low	180
Foote Pond Dam	1971	76	16	244	Low	0
Taylor Pond Dam	1965	30	12	1,252	Low	1
Red Hill River Dam	1870	125	7	159	Low	5
Lake Tarleton Dam	1933	416	8	1,252	Low	7
Pratt Pond Dam	1890	58	7	128	Low	1
Hall Pond Dam	1941	38	9	479	Low	1
Knight Meadow Pond Dam	1966	83	9	748	Low	4
Shannon Lake Dam	1969	15	20	3,195	Significant	2
Blaisdell Lake Dam	1916	425	9	148	Low	2
Durham Reservoir Dam	1935	44	17	444	High	0
Oyster Reservoir Dam	1934	172	21	4,997	Significant	17
Coon Brook Bog Dam	1947	90	10	0	Low	1
Dan Hole River Dam	1935	53	29	1,181	Significant	12
Rochester Sewage Lagoon Dam	1980	265	10	0	Significant	0
Pearl Lake Dam	1935	72	10	1,076	Low	6
Coffin Pond Dam	1960	32	10	194	Low	0
Boundary Pond Dam	1952	40	10	130	Low	0
Cass Pond Dam	·	34	10	1,961	Low	31
Chandler Pond Dam	1939	68	14	1,537	Significant	6
Goodrich Falls Dam	1935	25	25	0	Low	53
Pearley Terrill Dam	1969	277	14	0	Low	5
Back Lake Dam	1934	574	7	207	Low	2
Little Bog Pond Dam	1935	168	18	345	Low	5
York Pond Dam	1930	65	12	30	Low	1
Akers Pond Dam	·	690	12	2,610	Low	10
Lincoln Sewage Lagoon Dam	1987	40	19	0	Significant	0
Locke 2 Dam	1969	70	60	551	Low	0
Lime Pond Dam	1934	38	10	182	Low	0
Locke Lake Dam	1965	448	12	434	Low	9
Currier Pond Dam	1963	36	10	933	Low	4
Pontook	1909	883	15	20,500	Low	1,214
Sugar River I	1928	50	18	2,300	Significant	74
Wendall Marsh Dam	·	104	15	3,130	Significant	50
Loon Lake Dam	1961	186	15	0	Significant	8
Cascade Waste Water Lagoon Dam	1975	67	13	70	Significant	0
Dickerman Pond Dam	1934	14	20	0	Significant	2
Dana Pond Dam	1975	37	20	684	Significant	1
Apthorp	1936	210	24	14,800	Significant	205
Ashland Sewage Lagoon Dam	1968	15	15	0	Significant	0
Godfrey Dam	1920	39	18	0	Significant	24
Hoit Road Marsh Dam	1968	153	9	351	Low	5
Flagpole Pond Dam	1967	280	21	482	Low	0
Fifield Farm Pond Dam	1966	33	13	80	Low	0
Boston Lot Lake Dam	1936	488	25	564	Significant	1
Dorr Woolen Sewage Lagoon Dam	1986	280	20	0	Significant	0
Cole Pond Dam	1973	88	10	359	Low	1
Paul Colsmann Dam I	1976	12	18	587	Low	0
Evas Marsh Dam	1962	62	9	142	Low	2
Fenn Dam	1984	48	36	639	Low	1
Hillsborough Sewage Lagoon Dam	1984	5	12	0	Significant	0
Hopkinton Sewage Lagoon Dam	1983	10	18	0	Significant	2
Contoocook River Dam	1861	15	15	3,500	Significant	21
Jaffrey Sewage Lagoon Dam	1984	118	25	0	Significant	0
Three Mile Reservoir Dam	1986	250	20	8,000	High	5
Colby Brook Dam	·	50	11	926	Low	10
Pingree Sawmill Dam	1812	13	12	342	Undetermined	4
Upper Recreation Pond Dam	1970	33	14	510	Low	0
Wong Wildlife Pond Dam	1976	65	19	338	Low	0
Century Village Dam	1988	40	8	0	Significant	2
Pea Porridge Pond Middle & Little	1966	210	17	895	Significant	3
Cohas Road Res Low Service Dam	1874	49	20	0	High	0
Pratt Pond Dike	·	90	9	0	Low	1
Jones Pond Dam	1981	145	19	0	High	0
Compressor Pond Dam	1900	10	28	29	Low	2
Waumbek Dam	1880	26	17	769	Low	29
Milton Waste Water Lagoons Dam	1985	10	20	0	Significant	0
Recreation Pond Dam	1957	15	8	295	Low	3
Mount Sunapee Sewage Lagoon Dam	1973	14	22	0	Significant	0
Gordon Hill Water Supply Dam	1934	10	15	250	Significant	1
Jackson Pond Dam	1894	210	12	260	Significant	1
Municipal Sewage Lagoon 1 Dam	1968	32	11	0	Significant	0
Municipal Sewage Lagoon 2	1968	15	11	0	Significant	0
Sauls Pond Dam	1988	50	10	0	Low	0
Beech River Mill Dam	1851	1	14	700	High	33
Verney Mill Hydro Dam	1916	7	25	0	High	44
Meriden Village Sewage Lagoon Dam	1982	9	9	0	Significant	0
Van Dyke Dam	1982	39	8	1,182	Low	3
Mountain Pond South Dam	1913	100	7	168	Low	0
Souhegan River Site 12a North Dike	1965	690	39	0	High	5
Clement Dam	1901	60	26	0	Significant	500
Perkins Pond Dam	1935	43	7	754	Low	3
Troy Sewage Lagoons Dam	1983	25	16	0	Significant	0
Melvin River Dam	1935	30	17	0	Significant	16
Corcoran Pond Dam	1976	21	17	3,057	High	3
Bethlehem Sewage Lagoon Dam	1985	14	13	0	Significant	0
Whitefield Lagoon Dam	1984	14	32	0	Significant	0
Frog Pond Dam	1916	4	15	123	Significant	0
Paper Mills Holding Pond Dam	1978	20	20	0	Significant	0
Seavey Pond Outlet Dam	·	17	8	150	Low	5
Marston Finn Conservation Dam	1778	168	14	1,278	Low	12
Pierce Pond Dam	1934	12	8	458	High	2
Canaan Street Lake Dam	1917	532	14	668	Low	2
Resort Waste Water Lagoon Dam	1987	12	15	0	Significant	0
Bear Hill Pond Dam	1885	48	7	1,130	Low	0
Hall Pond Dike	1955	38	7	0	Low	1
Mcgary Fletcher Rec Pond Dam	1978	7	18	251	Significant	0
Colebrook Sewage Lagoon Dam	1980	15	15	0	Significant	0
Rolfe Canal Penstock Intake Dam	1986	25	18	1,200	Low	766
Ragged Mountain Snow Pond Dam	1996	10	49	129	Low	0
Black Fox Pond Dam	1986	114	12	212	Low	0
Derry Waste Lagoon Dam	1978	346	21	0	Significant	0
Beards Creek Dam	1953	39	17	1,130	Significant	3
Montcalm Golf Club Dam	1984	9	27	59	Low	0
Exeter Sewage Lagoon Dam	1989	55	12	30	Significant	0
Crotched Mtn Storage Lagoon Dam	1989	20	15	0	Significant	0
Cobble Mountain Dam	1986	124	19	1,140	Low	3
Icy Gulch Reservoir Dam	1940	8	18	986	Significant	2
Gunnison Lake Site D2 Dam	1983	1,065	62	23,538	High	6
Wildsong Farm Pond Dam 1	1969	45	16	0	Low	0
Wildsong Farm Pond Dike	1969	51	18	320	Low	0
Deep Hole Pond Dam	1974	38	15	1,832	Low	4
Dole Reservoir Dike	1913	24	8	100	Significant	0
Flintlock Estates Fire Pond Dam	1987	90	8	18	Low	0
Belanger Recreation Pond Dam	1992	40	12	100	Low	0
Huckins Mill Dam	·	35	13	0	Undetermined	202
Pawtuckaway Lake/ Drowns Dike	1842	3,564	12	0	Low	21
First Conn Lake South Bay Dike	·	15,950	14	0	Low	82
Eel Pond Dam	1991	60	6	80	Low	2
Sunapee	1856	5	15	600	Significant	45
Rockingham Cnty Wastewtr Lagoon Dam	1990	63	13	0	Significant	0
Canaan Sewage Lagoon Dam	1991	5	13	0	Significant	0
Socha Dam	1980	45	8	2,893	Low	4
Morrill Mill Pond Dam	1800	102	11	650	Low	3
Deer Meadow Pond Dam	1938	73	15	350	Low	2
Sheep Davis Road Dam	1990	13	24	213	Low	1
Conway Treatment Lagoon Dam	1989	12	7	0	Significant	0
Davison Wildlife Pond Dam	1968	39	23	644	Low	2
Echo Lake Dam	1990	570	7	155	Low	1
Scribner Road Dam	1963	46	12	1,550	Low	52
Pheasant Ridge Cc Pond Dam	1976	44	25	543	Low	0
Moose Brook Dam	1977	132	9	2,406	Low	6
Ferson Pond Dam	1998	18	7	220	Low	0
Silver Lake Dam	·	90	8	150	Low	0
Gilson Pond Dam	1937	52	11	444	Low	1
Poole Reservoir Dam	1926	23	14	571	Significant	1
Goose Pond Dike	1868	344	8	0	Low	2
Israel River	1981	16	22	15,240	Low	133
Lebanon Water Treatment Intake Dam	1934	1	16	5,314	Significant	169
High View Wildlife Pond Dam	1968	34	27	343	Low	0
Loon Pond Dam	·	38	7	274	Low	0
Souhegan Site 8 Cemetery Dike	1977	253	16	0	Low	4
Souhegan Site 8 South Dike	1977	130	9	0	Low	4
Nashua Canal Dike	1886	160	25	2,680	Undetermined	1
Newfields Sewage Lagoon Dam	1982	9	19	0	Significant	0
Stubbs Pond Dam	1963	100	8	206	Low	1
Cranberry Meadow Pond Dam	·	107	8	0	Low	2
Adams Pond Dam	1962	60	10	677	Low	0
Chadwick Meadows Wildlife Ref Dam	1970	45	38	1,985	Significant	6
Sand Pond Dam	1927	35	10	693	Low	4
Village Pond Dam	1919	36	15	1,100	Significant	8
Riverdale Dam	·	87	10	0	Low	47
Dream Lake Dam	1966	61	9	8	Undetermined	0
Country Club Pond Dam	1996	19	25	227	Low	0
Atkinson Cc Lagoon Dam	2001	3	14	0	Significant	0
Branch Mallego Brook Dam	1935	32	8	551	Low	2
Rochester Reservoir Dike Spillway	1935	550	2	383	High	0
Wildlife Pond Dam	·	19	10	0	Undetermined	1
Walker Pond Dam	1900	335	6	130	Undetermined	9
Flagpole Pond Dike	1967	280	15	0	Low	0
Ice Pond Dam And Dike	1972	10	8	332	High	1
Mountain Lake Dam	·	75	11	1,020	Low	1
Charlestown Ww Lagoon Dam	1996	6	5	0	Significant	0
Diamond Pond	1979	24	12	0	Undetermined	2
Thurston Pond Dam	1772	6	9	230	Undetermined	1
Mud Pond North Dike	·	110	10	0	Low	2
Balsams Mohawk River Dam	·	2	55	370	Significant	4
Thornwood Commons Pond Dam	1961	11	16	132	Significant	0
Wildlife Pond Dam	1955	23	16	146	Undetermined	0
Shop Pond Dam	1935	3	13	93	Significant	3
Cheshire Mills Lower Dam	1848	2	18	1,097	High	10
Lisbon Wastewater Lagoons Dam	1994	29	13	0	Significant	0
Winding Brook Road Dam	1980	5	8	340	Significant	2
Manchester Airport Det Pond Dam	1992	0	27	130	Low	0
Sanborn Sawmill Dam	1830	1	13	565	High	5
Stone Pond Overflow Dam	·	75	6	125	Low	1
Wildlife Pond Dam	·	24	9	0	Low	0
Piscassic Ice Pond Dam	1939	27	12	0	Low	4
Wildlife Pond Dam	1972	36	12	546	Low	0
Middle Hancock Llc Dam	1976	63	9	700	Low	1
Pittsfield Sewage Lagoon	1997	28	18	0	Significant	0
Baker River Site 5 Dike	1969	39	20	0	Low	4
Ches Cnty Ww Lagoon Dam	1971	4	20	0	Significant	0
Ws Packaging Canal Dam	1876	8	15	72	High	0
Skating Pond Dam	1974	2	8	102	Undetermined	0
Mwh Sewage Lagoons Dam	2000	13	19	0	Significant	0
New Hampton Village Prct Ww Lagoon	1930	15	5	0	Significant	0
Camp Foss Sewage Lagoon Dam	1979	0	10	0	Significant	0
Waterville Valley Lagoons Dam	1972	26	19	0	Significant	0
Dead River Dike	1970	0	14	0	Low	6
Shehan Pond Dam	1960	500	25	0	Low	4
Old Mill Pond Dam	1935	3	11	210	Significant	1
Campus Drive Dam	2006	9	26	88	Significant	0
Lcs Settling Ponds 4 And 5 Dam	1980	45	15	3	Low	0
Seavey Pond Dike Access Road	2002	17	10	0	Low	5
Upper Bucknell Pond Dam	2004	30	25	107	Undetermined	0
Perry Pond Dam	1947	30	7	189	Undetermined	1
Pemigewasset River Levee	1960	0	15	0	High	115
Antrim Sewage Lagoons	1978	12	13	0	Significant	0
Monadnock Paper Indust Lag Dam	1973	25	14	0	Significant	0
Bodwell Septage Facility Dam	2011	4	9	0	Significant	0
Webster Valve Co Dam	1901	1	15	659	Significant	19
Ossipee Lake Dam Berry Bay	1919	23,300	12	0	Low	357
Sargent Center Infiltration Lagoon	·	3	11	0	Significant	0
Dartmouth Skiway Sewage Lagoon	1967	1	4	10	Significant	0
Ymca Camp Takodah Sewage Lagoon Dam	1940	3	8	0	Significant	0
Pickering Ponds Dam	1980	204	24	0	Low	0
Mt Carberry Leachate Pond Dam	·	0	5	3	Significant	0
Jones Pond Dike	1981	75	12	0	Significant	0
Groveton Paper Mill Lagoons Dam	2013	10	25	0	Significant	0
Groveton Municipal Lagoons Dam	2013	22	20	0	Significant	0
Farmington Levee	1956	0	15	0	High	36
Wadleigh Falls	·	85	13	0	Undetermined	154
Merrimack River Right Bank Fdr	1949	0	15	0	High	4,000
Epping Wastewater Lagoons	1970	47	9	0	Significant	0
Balsams Wastewater Lagoons	1965	17	28	0	Significant	0
Unh Water Treament Residual Lagoons	2017	1	5	0	Significant	0
Godbout Pond West Dike	1970	77	25	·	Low	1
Sugar River Ii	2009	11	10	2,000	Significant	74
Stevens Mill	1930	7	22	2,600	Significant	488
Hatfields	1937	6	20	7,397	Significant	64
Franklin Falls Hydro Dam 2	1888	10	20	2,000	Significant	457
Union Street	1916	9	15	3,500	Significant	44
South Milton	1893	53	15	10,280	Low	250

Reservoir FAQ

About New-Hampshire dams & reservoirs

Where does the New-Hampshire dam data come from?

The U.S. Army Corps of Engineers National Inventory of Dams (NID) plus state water-resource agencies. Snoflo joins these public records with live USGS streamgauge readings downstream where available. The NID is the canonical federal dam registry.

What does Hazard Potential mean?

USACE classifies every dam by what would happen if it failed: Low (no loss of life expected, minimal economic damage), Significant (no loss of life but economic, environmental, or lifeline damage), High (loss of life expected). It's a downstream-consequence rating, not a likelihood of failure.

What is Normal Storage in acre-feet?

The volume of water the reservoir holds at its normal operating level, measured in acre-feet. One acre-foot is about 325,851 gallons or 1,233 cubic meters — the amount needed to cover one acre to a depth of one foot.

Why are some New-Hampshire dams missing storage or height data?

USACE NID records can have gaps for small or older dams that pre-date federal reporting requirements. Snoflo surfaces whatever the canonical record contains. If a dam you care about has incomplete data, contact the operating agency or USACE for updates.

Can I see live water levels?

Yes — tap any dam name to open its detail page, which pulls live storage data from USGS streamgauges or operating-agency feeds where available. Historical levels and seasonal averages are also shown.

Why does New-Hampshire have so many dams?

The U.S. has over 90,000 dams — most built between 1930 and 1980 during the federal water-development era. New-Hampshire's count reflects a combination of agricultural irrigation needs, flood control, hydropower, and recreation. The "Built by decade" chart above shows the timeline.