Dams in Penobscot County, Maine
67Total Dams
8High Hazard
7Significant
Dam Safety in Penobscot County, Maine
Penobscot County has 67 dams tracked in the National Inventory of Dams. Of these, 8 are classified as high hazard — meaning failure would probably cause loss of human life. Another 7 carry a significant hazard classification. Currently, 13 dams have a condition assessment of poor or unsatisfactory.
The average dam in Penobscot County is 112 years old. The most common purpose is hydroelectric. The tallest dam is Dolby at 66 ft.
Explore more: Oldest dams in Maine · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Dolby | High | Satisfactory | 66 | Hydroelectric | 1906 |
| Mattaceunk | High | Satisfactory | 45 | Hydroelectric | 1939 |
| North Twin | High | Satisfactory | 35 | Hydroelectric | 1934 |
| Stone Dam | High | Satisfactory | 27 | Hydroelectric | 1900 |
| Grand Lake (matagamon) | High | Poor | 25 | Hydroelectric | 1941 |
| Millinocket Lake | High | Satisfactory | 20 | Hydroelectric | 1910 |
| Wassookeag Lake | High | Satisfactory | 14 | Flood Risk Reduction | 1914 |
| Stone Dam - Dike 8 | High | Satisfactory | 9 | Hydroelectric | 1900 |
| Malletts Mill | Significant | Poor | 16 | Fire Protection, Stock, Or Small Fish Pond | 1836 |
| North Twin - Dike 3 | Significant | Satisfactory | 15 | Hydroelectric | 1934 |
| North Twin - Dike 4 | Significant | Satisfactory | 11 | Hydroelectric | 1934 |
| North Twin - Dike 2 | Significant | Satisfactory | 11 | Hydroelectric | 1934 |
| North Twin - Dike 5 | Significant | Satisfactory | 11 | Hydroelectric | 1934 |
| North Twin - Dike 1 | Significant | Satisfactory | 11 | Hydroelectric | 1934 |
| Swetts Pond | Significant | Poor | 6 | Flood Risk Reduction | 1946 |
| Pond Farm | Low | Fair | 40 | Recreation | 1920 |
| West Enfield | Low | Satisfactory | 39 | Hydroelectric | 1988 |
| Medway | Low | Satisfactory | 35 | Hydroelectric | 1922 |
| Milford | Low | Satisfactory | 34 | Hydroelectric | 1906 |
| Lowell Tannery | Low | Satisfactory | 27 | Hydroelectric | 1987 |
| East Millinocket | Low | Satisfactory | 26 | Hydroelectric | 1907 |
| Stillwater | Low | Satisfactory | 25 | Hydroelectric | 1902 |
| Rocky Bottom | Low | Not Rated | 20 | Hydroelectric | 1965 |
| Mattanawcook Pond | Low | Poor | 19 | Flood Risk Reduction | 1918 |
| Folsom Pond | Low | Poor | 18 | Flood Risk Reduction | 1918 |
| Mill Pond Lpp | Low | Not Rated | 18 | Flood Risk Reduction | 1917 |
| Howland | Low | Not Rated | 17 | Hydroelectric | 1916 |
| Village | Low | Not Rated | 16 | Hydroelectric | 1826 |
| Whitney Irrigation Pond | Low | Poor | 16 | Irrigation | 1950 |
| Sebasticook | Low | Satisfactory | 15 | Hydroelectric | 1988 |
| Garland Pond | Low | Fair | 15 | Fire Protection, Stock, Or Small Fish Pond | 1905 |
| Gristmill Pond | Low | Unsatisfactory | 15 | Hydroelectric | 1978 |
| Run Around | Low | Satisfactory | 15 | Hydroelectric | 1894 |
| Gilman Mill | Low | Not Rated | 15 | Hydroelectric | 1963 |
| Orono | Low | Satisfactory | 15 | Hydroelectric | 1917 |
| Brewer Lake | Low | Not Rated | 14 | Water Supply | 1900 |
| Long Pond | Low | Not Rated | 14 | Hydroelectric | 1949 |
| Spragues Mill | Low | Poor | 14 | Recreation | 1955 |
| Cold Stream Pond | Low | Fair | 13 | Fish and Wildlife Pond | 1890 |
| Sam Ayers Deadwater Outlet Dam | Low | Not Rated | 13 | Fish and Wildlife Pond | 2002 |
| Stanhope Mill #2 Lower | Low | Not Rated | 13 | Hydroelectric | 1827 |
| Lowell Lake | Low | Poor | 12 | Other | 1900 |
| French Stream | Low | Not Rated | 12 | Recreation | 1850 |
| Cambolasse Pond | Low | Not Rated | 12 | Recreation | 1950 |
| Lovley's Dam | Low | Not Rated | 12 | Recreation | 1974 |
| Long Pond | Low | Not Rated | 12 | 1915 | |
| Stump Pond | Low | Poor | 12 | Hydroelectric | 1936 |
| Plymouth | Low | Not Rated | 11 | Other | 1920 |
| Puffers Pond | Low | Satisfactory | 10 | Recreation | 1810 |
| Upper | Low | Poor | 10 | Hydroelectric | 1900 |
| Eskutassis Pond | Low | Poor | 10 | Other | 1860 |
| Dwinal Pond | Low | Not Rated | 10 | Recreation | 1947 |
| Stone Dam - Dike 3 | Low | Satisfactory | 10 | Hydroelectric | 1900 |
| Stone Dam - Dike 1 | Low | Satisfactory | 10 | Hydroelectric | 1900 |
| Stone Dam - Dike 2 | Low | Satisfactory | 10 | Hydroelectric | 1900 |
| Upper Stetson Stream | Low | Not Rated | 10 | Recreation | 1853 |
| Stone Dam - Dike 7 | Low | Satisfactory | 9 | Hydroelectric | 1900 |
| Stone Dam - Dike 4 | Low | Satisfactory | 9 | Hydroelectric | 1900 |
| Stone Dam - Dike 6 | Low | Satisfactory | 9 | Hydroelectric | 1900 |
| Stone Dam - Dike 5 | Low | Satisfactory | 9 | Hydroelectric | 1900 |
| Eddington-holbrook | Low | Not Rated | 8 | Recreation | 1802 |
| Garland Pond Dike | Low | Poor | 8 | Recreation | 1905 |
| Sawtelle Deadwater | Low | Not Rated | 8 | Hydroelectric | 1880 |
| Great Works Stream | Low | Not Rated | 8 | Other | 1963 |
| Gilman Falls | Low | Satisfactory | 8 | Hydroelectric | 1906 |
| Pushaw Lake | Low | Not Rated | 8 | Other | 1920 |
| Leonards Mill | Low | Not Rated | 7 | Hydroelectric | 1796 |