Dams in San Mateo County, California
21Total Dams
12High Hazard
1Significant
Dam Safety in San Mateo County, California
San Mateo County has 21 dams tracked in the National Inventory of Dams. Of these, 12 are classified as high hazard — meaning failure would probably cause loss of human life. Another 1 carry a significant hazard classification. Currently, 3 dams have a condition assessment of poor or unsatisfactory.
The average dam in San Mateo County is 106 years old. The most common purpose is water supply. The tallest dam is Ler Crystal Springs at 149 ft.
Explore more: Oldest dams in California · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Ler Crystal Springs | High | Satisfactory | 149 | Water Supply | 1888 |
| San Andreas | High | Fair | 107 | Water Supply | 1870 |
| Pilarcitos | High | Poor | 103 | Water Supply | 1866 |
| Spencer Lake | High | Satisfactory | 87 | Flood Risk Reduction | 1876 |
| Searsville | High | Satisfactory | 68 | Water Supply | 1890 |
| Pomponio Ranch | High | Satisfactory | 64 | Other | 1952 |
| Bear Gulch | High | Poor | 61 | Water Supply | 1896 |
| Emerald Lake 1 Ler | High | Satisfactory | 57 | Water Supply | 1885 |
| Notre Dame | High | Satisfactory | 51 | Water Supply | |
| Coastways | High | Satisfactory | 46 | Water Supply | 1951 |
| Crocker | High | Satisfactory | 45 | Water Supply | 1890 |
| Laurel Creek | High | Satisfactory | 40 | Flood Risk Reduction | 1969 |
| Upper Pond | Significant | Not Available | 30 | Other | |
| Rickey | Low | Satisfactory | 64 | Water Supply | 1951 |
| Canada Road | Low | Satisfactory | 52 | Other | 1971 |
| Bean Holl #3 | Low | Poor | 40 | Water Supply | 1939 |
| Green Oaks #1 | Low | Satisfactory | 39 | Other | 1936 |
| Johnston | Low | Satisfactory | 31 | Water Supply | 1919 |
| Bean Holl #2 | Low | Satisfactory | 31 | Water Supply | 1938 |
| Lake Lucerne | Low | Satisfactory | 21 | Water Supply | 1923 |
| Marina Lagoon | Low | Satisfactory | 17 | Flood Risk Reduction | 1953 |