Dams in Contra Costa County, California
26Total Dams
23High Hazard
0Significant
Dam Safety in Contra Costa County, California
Contra Costa County has 26 dams tracked in the National Inventory of Dams. Of these, 23 are classified as high hazard — meaning failure would probably cause loss of human life.
The average dam in Contra Costa County is 64 years old. The most common purpose is water supply. The tallest dam is Briones at 273 ft.
Explore more: Oldest dams in California · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Briones | High | Satisfactory | 273 | Other | 1964 |
| Los Vaqueros | High | Satisfactory | 231 | Water Supply | 1997 |
| San Pablo | High | Satisfactory | 170 | Water Supply | 1920 |
| Lafayette | High | Fair | 132 | Water Supply | 1929 |
| Maloney | High | Satisfactory | 107 | Water Supply | 1960 |
| C.l. Tilden Park | High | Satisfactory | 88 | Other | 1938 |
| Pine Creek | High | Satisfactory | 87 | Flood Risk Reduction | 1956 |
| North | High | Satisfactory | 82 | Water Supply | 1961 |
| Danville | High | Satisfactory | 75 | Water Supply | 1961 |
| Martinez Dam | High | Not Available | 62 | Water Supply | 1947 |
| Marsh Creek | High | Satisfactory | 59 | Flood Risk Reduction | 1963 |
| Lake Orinda | High | Satisfactory | 45 | Water Supply | 1935 |
| Vista Del Mar Detention Basin | High | Satisfactory | 42 | Flood Risk Reduction | 2011 |
| Leland | High | Satisfactory | 41 | Water Supply | 1955 |
| Upper Sand Creek Detention Basin | High | Satisfactory | 40 | Flood Risk Reduction | 2014 |
| Moraga | High | Satisfactory | 37 | Water Supply | 1965 |
| Mallard | High | Satisfactory | 30 | Water Supply | 1930 |
| Antioch Reservoir | High | Satisfactory | 30 | Flood Risk Reduction | 1935 |
| Dry Creek | High | Satisfactory | 30 | Flood Risk Reduction | 1963 |
| Pine Creek Detention | High | Satisfactory | 30 | Flood Risk Reduction | 1981 |
| Deer Creek | High | Satisfactory | 29 | Flood Risk Reduction | 1963 |
| Sobrante Clearwell | High | Satisfactory | 28 | Water Supply | 1964 |
| Argyle No. 2 | High | Satisfactory | 27 | Water Supply | 1970 |
| Clifton Court Forebay | Low | Satisfactory | 34 | Other | 1970 |
| Clearwell Phase 2 | Low | Satisfactory | 30 | Water Supply | 1977 |
| Contra Loma Dike 3 | Low | Not Available | 10 | 1967 |