High Hazard Dams
Loss of human life is likely if the dam fails.
| Dam Name | Hazard | Height | Built | Type | State |
|---|---|---|---|---|---|
| Upper Buffalo No.4 Marion | High Hazard | 53 ft | 1984 | Earth | West Virginia |
| Upper Caney Creek WS SCS Site 1 Dam Leon | High Hazard | 33 ft | 1981 | Earth | Texas |
| Upper Canyon Comanche | High Hazard | 30 ft | 1905 | Stone | Oklahoma |
| Upper Castanea Reservoir Clinton | High Hazard | 30 ft | 1869 | Earth | Pennsylvania |
| Upper Chiquita Orange | High Hazard | 177 ft | 2012 | Earth | California |
| Upper Cibolo Creek WS SCS Site 1 Dam Kendall | High Hazard | 87 ft | 1978 | Earth | Texas |
| Upper Cibolo Creek WS SCS Site 2 Dam Kendall | High Hazard | 54 ft | 1980 | Earth | Texas |
| Upper Cibolo Creek WS SCS Site 3 Dam Kendall | High Hazard | 76 ft | 1980 | Earth | Texas |
| Upper Cibolo Creek WS SCS Site 4 Dam Kendall | High Hazard | 56 ft | 1980 | Earth | Texas |
| Upper City Lake Dam Anderson | High Hazard | 22 ft | 1974 | Earth | Texas |
| Upper Clinch River Dam #8 Tazewell | High Hazard | 58 ft | — | Earth | Virginia |
| Upper Clinch Valley Dam #1b Tazewell | High Hazard | 76 ft | — | Earth | Virginia |
| Upper Club Lake Dam Freestone | High Hazard | 16 ft | 1906 | Earth | Texas |
| Upper County Squire Dam Kenton | High Hazard | 35 ft | 1996 | Earth | Kentucky |
| Upper Cove Lake Dam Cobb | High Hazard | 26 ft | — | Earth | Georgia |
| Upper Dam Butler | High Hazard | 22 ft | — | Earth | Kansas |
| Upper Dam Oxford | High Hazard | 25 ft | 1883 | Concrete | Maine |
| Upper Deckers No. 1 Preston | High Hazard | 46 ft | 1969 | Earth | West Virginia |
| Upper Deckers No. 2 Preston | High Hazard | 34 ft | 1966 | Earth | West Virginia |
| Upper Deckers No. 4 Preston | High Hazard | 39 ft | 1966 | Earth | West Virginia |
| Upper Deckers No. 5 Preston | High Hazard | 53 ft | 1967 | Earth | West Virginia |
| Upper Deckers No. 6 Preston | High Hazard | 24 ft | 1968 | Earth | West Virginia |
| Upper Deckers No. 7 Preston | High Hazard | 13 ft | 1968 | Earth | West Virginia |
| Upper Delta Basin Enlargement Sweetwater | High Hazard | 40 ft | 2013 | Earth | Wyoming |
| Upper Doniphan Dam Ray | High Hazard | 22 ft | 1980 | Earth | Missouri |
| Upper Dry Fork Sanders | High Hazard | — | 1940 | Earth | Montana |
| Upper Duck Creek Interim Detention Basin Dam Clark | High Hazard | 49 ft | — | Earth | Nevada |
| Upper East Fk Laterals WS SCS Site 10 Dam Kaufman | High Hazard | 28 ft | 1956 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 11 Dam Kaufman | High Hazard | 35 ft | 1964 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 2 Dam Collin | High Hazard | 36 ft | 1958 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 3b Dam Collin | High Hazard | 34 ft | 1958 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 3c Dam Rockwall | High Hazard | 28 ft | 1959 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 3e Dam Rockwall | High Hazard | 28 ft | 1959 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 3g Dam Rockwall | High Hazard | 25 ft | 1959 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 4a Dam Rockwall | High Hazard | 31 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 4b Dam Rockwall | High Hazard | 40 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 4 Dam Rockwall | High Hazard | 35 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 5a Dam Rockwall | High Hazard | 39 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 5b Dam Rockwall | High Hazard | 34 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 5c Dam Rockwall | High Hazard | 29 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 6 Dam Rockwall | High Hazard | 32 ft | 1955 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 7 Dam Rockwall | High Hazard | 26 ft | 1967 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 9a Dam Kaufman | High Hazard | 24 ft | 1956 | Earth | Texas |
| Upper East Fk Laterals WS SCS Site 9 Dam Kaufman | High Hazard | 25 ft | 1956 | Earth | Texas |
| Upper Falls Creek Lake Dam Harris | High Hazard | 32 ft | 1950 | Earth | Georgia |
| Upper Field 14 Reservoir Maui | High Hazard | 38 ft | 1985 | Earth | Hawaii |
| Upper Gila Valley Site No. 10 Dam Grant | High Hazard | 47 ft | 1963 | Earth | New Mexico |
| Upper Gila Valley Site No. 11 Dam Grant | High Hazard | 31 ft | 1963 | Earth | New Mexico |
| Upper Gila Valley Site No. 12 Dam Grant | High Hazard | 30 ft | 1963 | Earth | New Mexico |
| Upper Gila Valley Site No. 1 Dam Grant | High Hazard | 26 ft | 1962 | Earth | New Mexico |