Dams in Napa County, California
59Total Dams
38High Hazard
12Significant
Dam Safety in Napa County, California
Napa County has 59 dams tracked in the National Inventory of Dams. Of these, 38 are classified as high hazard — meaning failure would probably cause loss of human life. Another 12 carry a significant hazard classification. Currently, 3 dams have a condition assessment of poor or unsatisfactory.
The average dam in Napa County is 67 years old. The most common purpose is water supply. The tallest dam is Monticello Dam at 304 ft.
Explore more: Oldest dams in California · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Monticello Dam | High | Not Available | 304 | Irrigation | 1957 |
| Rector Creek | High | Satisfactory | 164 | Water Supply | 1946 |
| Conn Creek | High | Fair | 125 | Water Supply | 1946 |
| Milliken | High | Satisfactory | 110 | Water Supply | 1924 |
| Lake Curry | High | Poor | 107 | Other | 1926 |
| Bell Canyon | High | Fair | 95 | Water Supply | 1959 |
| Heitz | High | Satisfactory | 87 | Other | 1991 |
| Kimball Creek | High | Satisfactory | 80 | Water Supply | 1939 |
| Deer Lake | High | Satisfactory | 72 | Water Supply | 1958 |
| Lake William | High | Satisfactory | 66 | Water Supply | 1960 |
| Lake Marie | High | Satisfactory | 60 | Water Supply | 1908 |
| Foss Valley | High | Satisfactory | 56 | Water Supply | 1988 |
| Crystal | High | Satisfactory | 51 | Water Supply | 1952 |
| Henne | High | Satisfactory | 49 | Water Supply | 1959 |
| Lake Leticia | High | Satisfactory | 49 | Water Supply | 1960 |
| Veterans Home | High | Fair | 47 | Water Supply | 1908 |
| Blanchard-offner | High | Satisfactory | 47 | Other | 1963 |
| B. J. Robinson | High | Satisfactory | 46 | Water Supply | 1957 |
| Olson | High | Satisfactory | 45 | Water Supply | 1955 |
| St. Helena Ler | High | Poor | 44 | Water Supply | 1878 |
| Will Lake #1 | High | Satisfactory | 40 | Other | 2004 |
| Araujo Reservoir No. 1 | High | Fair | 39 | Other | 1950 |
| Maxville | High | Satisfactory | 37 | Water Supply | 1953 |
| Angwin | High | Satisfactory | 35 | Water Supply | 1967 |
| Turkey Ranch | High | Satisfactory | 35 | Water Supply | 1999 |
| Metcalf | High | Satisfactory | 34 | Water Supply | 1974 |
| Araujo Reservoir No. 2 | High | Fair | 33 | 1950 | |
| Robert L. Matheson | High | Satisfactory | 32 | Water Supply | 1954 |
| Eaton H. Magoon Lake | High | Satisfactory | 32 | Water Supply | 1965 |
| Duvall | High | Satisfactory | 30 | Other | 1940 |
| Winery Lake | High | Satisfactory | 29 | Water Supply | 1953 |
| Orville | High | Satisfactory | 28 | Water Supply | 1959 |
| Circle S | High | Satisfactory | 28 | Water Supply | 1979 |
| Usibelli No. 2 | High | Satisfactory | 26 | Water Supply | 1973 |
| Hestan Vineyards Dam | High | Fair | 21 | Water Supply | |
| Lake Camille | High | Satisfactory | 21 | Water Supply | 1880 |
| Lake Cynthia | High | Satisfactory | 20 | Water Supply | 1955 |
| Peju Reservoir No. 2 | High | Poor | 14 | Water Supply | |
| Dick Week | Significant | Satisfactory | 70 | Water Supply | 1955 |
| Lake La Verne | Significant | Satisfactory | 50 | Water Supply | 1956 |
| Davis | Significant | Satisfactory | 42 | Water Supply | 1955 |
| Veeder Hills Dam | Significant | Satisfactory | 42 | Irrigation | |
| Scotts Canyon | Significant | Satisfactory | 41 | Other | 1948 |
| Jameson Vineyards | Significant | Satisfactory | 41 | Water Supply | |
| Burns | Significant | Satisfactory | 39 | Water Supply | 1956 |
| Linda Vista | Significant | Satisfactory | 39 | Water Supply | 1959 |
| Bassett Brown | Significant | Fair | 36 | Irrigation | 1990 |
| Hardester North | Significant | Satisfactory | 36 | Water Supply | 2003 |
| Naz Lake | Significant | Satisfactory | 29 | Water Supply | 1955 |
| Hudson Vineyards | Significant | Fair | 25 | Water Supply | 1983 |
| La Herradura | Low | Satisfactory | 73 | Other | 1948 |
| Moskowite | Low | Satisfactory | 50 | Water Supply | 1955 |
| Deer Creek | Low | Satisfactory | 40 | Water Supply | 1980 |
| Napa Valley Lake | Low | Satisfactory | 40 | Other | 1990 |
| Montana Lake | Low | Satisfactory | 39 | Other | 2009 |
| Long Valley West No. 2 | Low | Satisfactory | 35 | Water Supply | 1982 |
| Morgan | Low | Satisfactory | 34 | Other | |
| Upper Twin Lake | Low | Satisfactory | 19 | Water Supply | 1987 |
| Ler Twin Lake | Low | Satisfactory | 18 | Water Supply | 1985 |