Dams in Mono County, California
20Total Dams
14High Hazard
1Significant
Dam Safety in Mono County, California
Mono County has 20 dams tracked in the National Inventory of Dams. Of these, 14 are classified as high hazard — meaning failure would probably cause loss of human life. Another 1 carry a significant hazard classification. Currently, 4 dams have a condition assessment of poor or unsatisfactory.
The average dam in Mono County is 100 years old. The most common purpose is water supply. The tallest dam is Long Valley at 126 ft.
Explore more: Oldest dams in California · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Long Valley | High | Satisfactory | 126 | Water Supply | 1941 |
| Grant Lake | High | Poor | 87 | Water Supply | 1940 |
| Gem Lake | High | Poor | 80 | Hydroelectric | 1917 |
| Bridgeport | High | Satisfactory | 63 | Water Supply | 1924 |
| Rush Meadows | High | Poor | 50 | Hydroelectric | 1925 |
| Lundy Lake | High | Satisfactory | 48 | Hydroelectric | 1911 |
| Saddlebag Lake | High | Satisfactory | 45 | Hydroelectric | 1921 |
| Agnew Lake | High | Poor | 30 | Hydroelectric | 1916 |
| Tioga Lake Auxiliary | High | Satisfactory | 19 | Hydroelectric | 1928 |
| Rhinedollar | High | Satisfactory | 18 | Hydroelectric | 1927 |
| Ler Twin Lake | High | Fair | 16 | Water Supply | 1888 |
| Upper Twin Lake | High | Fair | 14 | Water Supply | 1905 |
| Topaz Lake | High | Satisfactory | 11 | Flood Risk Reduction | 1937 |
| Lake Mary | High | Not Rated | 10 | Water Supply | 1934 |
| Lake Mamie | Significant | Not Rated | 6 | Water Supply | 1968 |
| Upper Gorge | Low | Satisfactory | 44 | Other | 1953 |
| Lobdel Lake | Low | Satisfactory | 27 | Water Supply | 1948 |
| Poore Lake Reservoir | Low | Satisfactory | 23 | Water Supply | 1900 |
| Black Reservoir | Low | Satisfactory | 18 | Water Supply | 1905 |
| Walker Lake | Low | Satisfactory | 12 | Water Supply |