Water Supply Dams
7,228 dams in the US serve this purpose.
| Dam Name | Hazard | Height | Built | Type | State |
|---|---|---|---|---|---|
| Samuel P. Senior Dam Fairfield | High Hazard | 130 ft | 1941 | Concrete | Connecticut |
| San Andreas San Mateo | High Hazard | 107 ft | 1870 | Earth | California |
| San Angelo Fish Hatchery Dam Schleicher | Low Hazard | 12 ft | 1891 | Concrete | Texas |
| San Antonio Monterey | High Hazard | 202 ft | 1965 | Earth | California |
| San Augustine City Lake Dam San Augustine | High Hazard | 46 ft | 1959 | Earth | Texas |
| Sand Canyon Orange | High Hazard | 58 ft | 1912 | Earth | California |
| Sand Creek Fresno | High Hazard | 60 ft | 1980 | Earth | California |
| Sanders Lake Dam Harrison | Low Hazard | 12 ft | 1962 | Earth | Texas |
| Sanders Lake Dam #1 North Missoula | Significant Hazard | 10 ft | 1913 | Earth | Montana |
| Sanderson Dam Montgomery | Significant Hazard | 49 ft | 1925 | Gravity | Arkansas |
| Sand Hollow North Dam Washington | High Hazard | — | 2002 | — | Utah |
| Sand Hollow West Dam Washington | High Hazard | — | 2002 | — | Utah |
| San Diego Reservoir Tuolumne | High Hazard | 39 ft | 1860 | Earth | California |
| San Dieguito San Diego | High Hazard | 51 ft | 1918 | Multi-Arch | California |
| San Dimas Los Angeles | High Hazard | 131 ft | 1922 | Gravity | California |
| Sand Ripple Farm Lake Dam Franklin | Low Hazard | 25 ft | 1961 | Earth | Kentucky |
| Sandwash Reservoir Dam Berkshire | High Hazard | 41 ft | 1936 | Rockfill | Massachusetts |
| Sandy Creek Lake Dam Coweta | Low Hazard | 21 ft | 1989 | Earth | Georgia |
| Sandy Lock and Dam Aitkin | Low Hazard | 14 ft | 1895 | Earth | Minnesota |
| Saner Lake No 1 Dam Maverick | Low Hazard | 19 ft | 1940 | Earth | Texas |
| San Felipe Ranch Santa Clara | Low Hazard | 49 ft | 1959 | Earth | California |
| Sanford Raw Water Reservoir Dam Lee | High Hazard | — | 1993 | Earth | North Carolina |
| Sangchris Lake Dam Christian | High Hazard | 55 ft | 1967 | Earth | Illinois |
| Sanhedrin Ranch Glenn | Low Hazard | 27 ft | 1967 | Earth | California |
| San Joaquin Reservoir Orange | High Hazard | 224 ft | 1966 | Earth | California |
| San Marcos San Luis Obispo | High Hazard | 42 ft | 1964 | Earth | California |
| San Marcos San Diego | High Hazard | 85 ft | 1958 | Earth | California |
| San Marcos San Diego | High Hazard | 52 ft | 1946 | Arch | California |
| San Pablo Contra Costa | High Hazard | 170 ft | 1920 | Earth | California |
| San Pablo Clearwell Contra Costa | Low Hazard | 42 ft | 1922 | Earth | California |
| San Saba River Channel Dam Menard | Low Hazard | 10 ft | 1987 | Concrete | Texas |
| Santa Fe Coconino | High Hazard | 42 ft | 1892 | Masonry | Arizona |
| Santa Fe Dam Los Angeles | High Hazard | 92 ft | 1949 | Earth | California |
| Santa Fe Lake Dam Macon | Low Hazard | 30 ft | 1900 | Earth | Missouri |
| Santa Fe Lake Dam Butler | High Hazard | 38 ft | 1927 | Earth | Kansas |
| Santa Fe Lake Dam Elk | Significant Hazard | 25 ft | 1895 | Earth | Kansas |
| Santa Felicia Ventura | High Hazard | 213 ft | 1955 | Earth | California |
| Santa Fe Railroad Dam Coleman | Low Hazard | 18 ft | 1913 | Earth | Texas |
| Santa Fe Seasonal Storage San Diego | High Hazard | 22 ft | 2004 | Earth | California |
| Santa Maria San Diego | High Hazard | 25 ft | 1995 | Earth | California |
| Santa Monica Debris Basin Santa Barbara | High Hazard | 102 ft | 1978 | Earth | California |
| Santaquin Wastewater Lagoons Utah | Significant Hazard | — | 2003 | Earth | Utah |
| Santa Rosa Creek Reservoir Sonoma | High Hazard | 37 ft | 1963 | Earth | California |
| Santa Ynez Canyon Los Angeles | High Hazard | 157 ft | 1968 | Earth | California |
| Santee Berkeley | High Hazard | 50 ft | 1942 | Earth | South Carolina |
| Santiago Creek Orange | High Hazard | 136 ft | 1933 | Earth | California |
| San Vicente San Diego | High Hazard | 338 ft | 1943 | Roller-Compacted Concrete | California |
| San Vicente Storage Pond 2 San Diego | High Hazard | 30 ft | 1991 | Earth | California |
| San Vicente Storage Pond 3 San Diego | Significant Hazard | 24 ft | 2002 | Earth | California |
| Sapulpa Lake Creek | High Hazard | 41 ft | 1913 | Earth | Oklahoma |