Significant Hazard Dams
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
| Dam Name | Hazard | Height | Built | Type | State |
|---|---|---|---|---|---|
| Amity Lake Dam Allegany | Significant Hazard | 22 ft | 1963 | Earth | New York |
| A. M. Puett Montezuma | Significant Hazard | 43 ft | 1960 | Earth | Colorado |
| Amsden Lake Dam Wood | Significant Hazard | 16 ft | — | Earth | Texas |
| Amsterdam Slough Burnett | Significant Hazard | 14 ft | 1968 | Gravity | Wisconsin |
| Amston Lake Dam Tolland | Significant Hazard | 10 ft | 1910 | Earth | Connecticut |
| Amtrak Railroad Culvert 100.18 Baltimore City | Significant Hazard | 24 ft | 1888 | Earth | Maryland |
| Amwell #2 Dam Hunterdon | Significant Hazard | 19 ft | — | Earth | New Jersey |
| Amwell No. 1 Dam Hunterdon | Significant Hazard | 22 ft | — | Earth | New Jersey |
| Amwell No. 3 Dam Hunterdon | Significant Hazard | 26 ft | 1970 | Earth | New Jersey |
| Amy Lake Dam Morgan | Significant Hazard | 35 ft | 2003 | Earth | Indiana |
| Analomink Lake Monroe | Significant Hazard | 11 ft | 1910 | Earth | Pennsylvania |
| Anasagunticook Oxford | Significant Hazard | 11 ft | 1900 | Concrete | Maine |
| Anchor Lake Summit | Significant Hazard | — | 1932 | Earth | Utah |
| Ancora Pond Dam Camden | Significant Hazard | 8 ft | — | Earth | New Jersey |
| Anderson #1 Mesa | Significant Hazard | 26 ft | 1963 | Earth | Colorado |
| Anderson #2 Mesa | Significant Hazard | 23 ft | 1974 | Earth | Colorado |
| Anderson Dam Chautauqua | Significant Hazard | 16 ft | 1954 | Earth | New York |
| Anderson Dam Gadsden | Significant Hazard | 25 ft | — | Earth | Florida |
| Anderson Farm Lagoon Dam Edgecombe | Significant Hazard | — | — | Earth | North Carolina |
| Anderson (Kenneth) Wasatch | Significant Hazard | — | 1900 | Earth | Utah |
| Anderson Lake Dam Macon | Significant Hazard | — | — | Earth | North Carolina |
| Anderson Lake Dam Franklin | Significant Hazard | 25 ft | 1961 | Earth | Ohio |
| Anderson Lakes Farm Dam No. 1 Warren | Significant Hazard | 19 ft | — | Earth | Ohio |
| Anderson Meadow Beaver | Significant Hazard | — | 1956 | Earth | Utah |
| Anderson Pond Sanpete | Significant Hazard | — | 1999 | Earth | Utah |
| Andover Lake Dam Tolland | Significant Hazard | 18 ft | 1926 | Earth | Connecticut |
| Andreasen Lower Franklin | Significant Hazard | 33 ft | 1960 | — | Idaho |
| Andreasen Upper Franklin | Significant Hazard | 29 ft | 1957 | — | Idaho |
| Andrews Dam Avery | Significant Hazard | — | — | Earth | North Carolina |
| Andrews Lake Dam Kent | Significant Hazard | 18 ft | — | Gravity | Delaware |
| Andrews Millpond Dam Darlington | Significant Hazard | 10 ft | — | — | South Carolina |
| Anets Woods West Basin Dam Cook | Significant Hazard | — | — | Earth | Illinois |
| Angel Lake Weld | Significant Hazard | 16 ft | 1899 | Earth | Colorado |
| Angel Lake Reservoir Elko | Significant Hazard | 14 ft | 1924 | Earth | Nevada |
| Angie McCone | Significant Hazard | 25 ft | 1943 | Earth | Montana |
| Angier Wastewater Dam Harnett | Significant Hazard | — | 1985 | Earth | North Carolina |
| Anglers Paradise Lake Dam Fairfield | Significant Hazard | 35 ft | 1951 | Earth | Ohio |
| Angulus Pond Dam Fairfield | Significant Hazard | 14 ft | — | Concrete | Connecticut |
| Angus Park Pond Dam Hartford | Significant Hazard | 16 ft | 1920 | Earth | Connecticut |
| Angus Ranch Ltd Uintah | Significant Hazard | — | — | Earth | Utah |
| Anjecondy Lake Dam Knox | Significant Hazard | 29 ft | 1950 | Earth | Ohio |
| Annabella Sevier | Significant Hazard | — | 1973 | Earth | Utah |
| Annabella East Detention Basin Sevier | Significant Hazard | — | 2017 | Earth | Utah |
| Annabella West Detention Basin Sevier | Significant Hazard | — | 2017 | Earth | Utah |
| Annandale Dam Dutchess | Significant Hazard | 11 ft | 1846 | Concrete | New York |
| Annandale Estates Lake Dam Brown | Significant Hazard | 24 ft | 1966 | Earth | Indiana |
| Annapolis Reservoir Anne Arundel | Significant Hazard | 15 ft | 1920 | Buttress | Maryland |
| Anne Fryer Parramore Dam Gadsden | Significant Hazard | 18 ft | 1973 | Earth | Florida |
| Anne Lake Dam Wake | Significant Hazard | — | — | Earth | North Carolina |
| Annex #8 Larimer | Significant Hazard | 26 ft | 1903 | Earth | Colorado |