Oldest Dams in New Hampshire

New Hampshire has 632 dams with recorded construction dates. The oldest dates to 1700 — 326 years ago. Many of New Hampshire's oldest dams were built as colonial-era mill dams, powering early industry along rivers and streams. Older dams require particular attention for safety, as many were built before modern engineering standards.

#	Dam	County	Year Built	Age	Height (ft)	Hazard	Condition
1	Pierce Pond Dam	Hillsborough	1700	326 yrs	8	High	Poor
2	Purity Lake Dam	Carroll	1750	276 yrs	13	High	Poor
3	Stark Pond Dam	Merrimack	1760	266 yrs	12	Low	Satisfactory
4	Conway Lake Dam	Carroll	1763	263 yrs	17	Significant	Fair
5	Warren Lake Dam	Cheshire	1771	255 yrs	13	High	Poor
6	Thurston Pond Dam	Rockingham	1772	254 yrs	9	Undetermined	Not Rated
7	Skatutakee Lake Dam	Cheshire	1778	248 yrs	13	Significant	Satisfactory
8	Marston Finn Conservation Dam	Rockingham	1778	248 yrs	14	Low	Not Rated
9	Stinson Lake Dam	Grafton	1780	246 yrs	8	Low	Satisfactory
10	Swanzey Lake Dam	Cheshire	1790	236 yrs	12	Low	Fair
11	Rollins Pond Dam	Belknap	1800	226 yrs	17	Low	Poor
12	Upper Kimball Pond Dam	Carroll	1800	226 yrs	10	High	Poor
13	Lake Tarleton Dam	Grafton	1800	226 yrs	8	Low	Satisfactory
14	Putney Meadow Pond Dam	Merrimack	1800	226 yrs	8	Low	Poor
15	Fountain Pond Center Dam	Merrimack	1800	226 yrs	14	Low	Not Rated
16	Morrill Mill Pond Dam	Merrimack	1800	226 yrs	11	Low	Poor
17	Ayers Pond Dam	Strafford	1810	216 yrs	18	Significant	Fair
18	Clark Pond East Dam	Rockingham	1811	215 yrs	8	Low	Fair
19	Pingree Sawmill Dam	Rockingham	1812	214 yrs	12	Undetermined	Not Rated
20	Granite Lake Dam	Cheshire	1814	212 yrs	11	High	Satisfactory
21	Runaway Pond East Dam	Merrimack	1814	212 yrs	15	Significant	Poor
22	Milton Three Ponds Dam	Strafford	1824	202 yrs	19	High	Poor
23	Great East Lake Dam	Carroll	1825	201 yrs	15	High	Poor
24	Woodsville	Grafton	1827	199 yrs	12	Significant	Satisfactory
25	Barnstead Parade Dam	Belknap	1830	196 yrs	16	High	Poor
26	Smith Pond Dam	Grafton	1830	196 yrs	12	High	Fair
27	Huckins Mill Dam	Merrimack	1830	196 yrs	13	Undetermined	Not Rated
28	Sanborn Sawmill Dam	Merrimack	1830	196 yrs	13	High	Satisfactory
29	Sanborn Pond Grist Mill Dam	Merrimack	1830	196 yrs	16	High	Fair
30	May Pond Dam	Sullivan	1830	196 yrs	14	Significant	Fair
31	Lower Damon Reservoir Dam	Cheshire	1832	194 yrs	13	High	Poor
32	Bow Lake Dam	Strafford	1832	194 yrs	24	High	Poor
33	Damon Upper Reservoir Dam	Cheshire	1835	191 yrs	14	High	Satisfactory
34	Hargate Dam	Merrimack	1835	191 yrs	14	Low	Satisfactory
35	Hubbard Pond Dam & Dike	Cheshire	1836	190 yrs	8	Significant	Fair
36	Woodward Pond Dam	Cheshire	1836	190 yrs	22	High	Satisfactory
37	Mirror Lake Dam	Grafton	1836	190 yrs	12	Low	Satisfactory
38	Campton Bog Pond Dam	Grafton	1836	190 yrs	10	Low	Fair
39	North Village Dam	Hillsborough	1836	190 yrs	12	Low	Fair
40	Souhegan Site 14 Dam	Hillsborough	1836	190 yrs	28	High	Fair
41	Grassy Pond Dam	Merrimack	1836	190 yrs	9	Low	Fair
42	Burton Pond Dam	Hillsborough	1837	189 yrs	14	Low	Fair
43	Meetinghouse Pond Dam	Cheshire	1840	186 yrs	7	Low	Satisfactory
44	Newfound Lake Dam	Grafton	1840	186 yrs	12	High	Poor
45	Lyford Pond Dam	Merrimack	1840	186 yrs	15	Significant	Poor
46	Mendums Pond Dam	Rockingham	1840	186 yrs	31	High	Poor
47	Marchs Pond Dam	Strafford	1840	186 yrs	8	High	Satisfactory
48	Pawtuckaway Lake/ Drowns Dike	Rockingham	1842	184 yrs	12	Low	Poor
49	Pawtuckaway Lake Dollof Dam	Rockingham	1842	184 yrs	28	High	Poor
50	Pawtuckaway Lake /drowns Dam	Rockingham	1842	184 yrs	18	Significant	Poor

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