High Hazard Dams
Loss of human life is likely if the dam fails.
| Dam Name | Hazard | Height | Built | Type | State |
|---|---|---|---|---|---|
| Webster Dam Colfax | High Hazard | 36 ft | 1909 | Earth | New Mexico |
| Webster Lake Dam Merrimack | High Hazard | 14 ft | 1873 | Concrete | New Hampshire |
| Webster Lake Dam - East Kosciusko | High Hazard | 12 ft | 1835 | Gravity | Indiana |
| Webster Lake Dam - West Kosciusko | High Hazard | 7 ft | 1835 | Gravity | Indiana |
| Wedgewood Lake Dam Lancaster | High Hazard | 17 ft | 1961 | Earth | Nebraska |
| Weed Shawano | High Hazard | 14 ft | 1967 | Gravity | Wisconsin |
| Weems Lake Dam Henry | High Hazard | 28 ft | 1960 | Earth | Georgia |
| Weger Dam #1 Bryan | High Hazard | 30 ft | — | — | Oklahoma |
| Wehrspann Dam Sarpy | High Hazard | — | 1983 | Earth | Nebraska |
| Weil Lake Dam Boone | High Hazard | 25 ft | — | Earth | Missouri |
| Weir and Johnson Delta | High Hazard | 21 ft | 1974 | Earth | Colorado |
| Weisner Hollow Slurry Jefferson | High Hazard | 192 ft | — | Rockfill | Pennsylvania |
| Weiss - Main Dam Cherokee | High Hazard | 86 ft | 1961 | Earth | Alabama |
| Welborn Dam Guilford | High Hazard | — | — | Earth | North Carolina |
| Welch Lake Dam Boone | High Hazard | 22 ft | 1960 | Earth | Missouri |
| Welcome Lake Dam King | High Hazard | — | 1959 | Earth | Washington |
| Weld Pond Dam Norfolk | High Hazard | 17 ft | 1900 | Masonry | Massachusetts |
| Weleetka Lake Okfuskee | High Hazard | 45 ft | 1923 | Earth | Oklahoma |
| Welkinweir Chester | High Hazard | 16 ft | 1937 | Earth | Pennsylvania |
| Wellesley Dam Henrico | High Hazard | 29 ft | — | Earth | Virginia |
| Wellington Jefferson | High Hazard | 70 ft | 1895 | Earth | Colorado |
| Wellington Nap C-21 Lafayette | High Hazard | 37 ft | 1969 | Earth | Missouri |
| Wellington Nap C-22 Lafayette | High Hazard | 36 ft | 1970 | Earth | Missouri |
| Wellington Nap C-23 Lafayette | High Hazard | 47 ft | 1970 | Earth | Missouri |
| Wellington Nap D-21a Lafayette | High Hazard | 55 ft | 1973 | Earth | Missouri |
| Wellington-Nap Wtrshd F-21 Dam Lafayette | High Hazard | 39 ft | 1967 | Earth | Missouri |
| Wellington Park Dam Fayette | High Hazard | 18 ft | 2000 | Earth | Kentucky |
| Wellington Upground Reservoir Lorain | High Hazard | 35 ft | 1972 | Earth | Ohio |
| Wells Chelan | High Hazard | 160 ft | 1968 | Gravity | Washington |
| Wells Branch Mills Pond Dam Travis | High Hazard | 17 ft | 1995 | Earth | Texas |
| Wells Brothers Upper Dam Johnston | High Hazard | — | — | Earth | North Carolina |
| Wells Lake Dam St. Francois | High Hazard | 28 ft | 1972 | Earth | Missouri |
| Wellston Reservoir Dam Jackson | High Hazard | 41 ft | 1920 | Earth | Ohio |
| Wellsville Lake Dam Montgomery | High Hazard | 5 ft | 1964 | Earth | Missouri |
| Welschmeyer's Dam Osage | High Hazard | 28 ft | 1978 | Earth | Missouri |
| Welshmans Lake Dam St. Francois | High Hazard | 32 ft | 1973 | Earth | Missouri |
| Wenas Dam Yakima | High Hazard | — | 1911 | Rockfill | Washington |
| Wenatchee Heights Reservoir No 2 Dam Chelan | High Hazard | — | 1998 | Earth | Washington |
| Wendell Falls Parkway Dam Wake | High Hazard | — | — | Other | North Carolina |
| Wendy Hill Dam Chatham | High Hazard | — | 1995 | Earth | North Carolina |
| Wendy Lake Dam White | High Hazard | 39 ft | — | Earth | Georgia |
| Wenscott Reservoir Providence | High Hazard | 10 ft | 1865 | Rockfill | Rhode Island |
| Wes Clark Cat Dam Garden | High Hazard | 30 ft | 1981 | Earth | Nebraska |
| Wesley E Seale Dam San Patricio | High Hazard | 81 ft | 1958 | Earth | Texas |
| Wesserunsett Somerset | High Hazard | 11 ft | 1800 | Concrete | Maine |
| West #1 Delta | High Hazard | 49 ft | 1950 | Earth | Colorado |
| West Akins Dam Polk | High Hazard | 37 ft | 1963 | Earth | Florida |
| West Balancing Reservoir Dam Tarrant | High Hazard | 51 ft | 1980 | Earth | Texas |
| West Bank Project Reservoir Franklin | High Hazard | — | 2003 | Earth | Washington |
| West Boggs Creek Structure No. 1 Martin | High Hazard | 51 ft | 1971 | Earth | Indiana |