High Hazard Dams
Loss of human life is likely if the dam fails.
| Dam Name | Hazard | Height | Built | Type | State |
|---|---|---|---|---|---|
| Zachry Lake Dam Franklin | High Hazard | 38 ft | 1955 | Earth | Texas |
| Zaiser Dam Des Moines | High Hazard | 61 ft | 2010 | Earth | Iowa |
| Zajic's East Canadian | High Hazard | 19 ft | — | — | Oklahoma |
| Zajic's West Canadian | High Hazard | 20 ft | — | — | Oklahoma |
| Zamora Lake Dam Jefferson | High Hazard | — | 1955 | Earth | Alabama |
| Zander Lake Dam Montgomery | High Hazard | 18 ft | 1968 | Earth | Missouri |
| Zanesville State Nursery Lake Dam Muskingum | High Hazard | 32 ft | — | Earth | Ohio |
| Zebulon Outdoor Storage Dam Wake | High Hazard | — | 2022 | Earth | North Carolina |
| Zehner Mill Pond Dam Marshall | High Hazard | 9 ft | 1933 | Earth | Indiana |
| Zeigler Pond Dam Orangeburg | High Hazard | 16 ft | 1960 | — | South Carolina |
| Zeman Lake Dam Jefferson | High Hazard | 34 ft | 1966 | Earth | Missouri |
| Zimber Ditch Detention Basin B Summit | High Hazard | 17 ft | 2007 | Concrete | Ohio |
| Zinsmeyer Lake Dam Franklin | High Hazard | 31 ft | 1967 | Earth | Missouri |
| Zintel Canyon Dam Benton | High Hazard | — | 1992 | Concrete | Washington |
| Zoellner Dam Perry | High Hazard | 62 ft | — | Earth | Missouri |
| Zollman Lake Dam Worth | High Hazard | 25 ft | 1972 | Earth | Missouri |
| Zoo Lake No 1 Dam Taylor | High Hazard | 12 ft | 1966 | Earth | Texas |
| Zoo Lake No 2 Dam Taylor | High Hazard | 12 ft | 1927 | Earth | Texas |
| Zorinsky Basin 2 Douglas | High Hazard | 39 ft | 2020 | Earth | Nebraska |
| Zorinsky Basin 3 - Whitehawk Douglas | High Hazard | 38 ft | 2002 | Earth | Nebraska |
| Zorinsky Dam Douglas | High Hazard | — | 1985 | Rockfill | Nebraska |
| Zosel Dam Okanogan | High Hazard | — | 1986 | Gravity | Washington |
| Zuber Draw Site 1 Dam Chaves | High Hazard | 28 ft | 1960 | Earth | New Mexico |
| Zuber Draw Site 2 Dam Chaves | High Hazard | 16 ft | 1960 | Earth | New Mexico |
| Zuber Draw Site 3 Dam Chaves | High Hazard | 22 ft | 1960 | Earth | New Mexico |
| Zuni Lake Dam Crawford | High Hazard | 51 ft | 1977 | Earth | Missouri |
| Zunino Reservoir Dam Elko | High Hazard | 20 ft | 1909 | Earth | Nevada |