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Browse Dams

1,534 dams in the National Inventory of Dams.

National Inventory of Dams

Browse 1,534 dams from the NID database. Each record includes dam name, location, physical dimensions, hazard potential classification, condition assessment, purpose, owner information, and emergency action plan status. Use the filters below to search by state, hazard level, condition, or keyword.

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Name State County Height (ft) Hazard Condition Year Purpose
Ler Kinney Lake California Alpine 40 Low Satisfactory 1926 Water Supply
Mary Street California Riverside 40 High Satisfactory 1981 Flood Risk Reduction
Riviera Reservoir California Los Angeles 40 High Satisfactory 1962 Water Supply
Sycamore Canyon California Ventura 40 High Satisfactory 1981 Flood Risk Reduction
Napa Valley Lake California Napa 40 Low Satisfactory 1990 Other
Halsey Afterbay California Placer 40 High Satisfactory 1913 Hydroelectric
Potrero California Los Angeles 40 High Satisfactory 1967 Other
Green Valley Lake California Solano 40 High Satisfactory 1956 Water Supply
Pigeon Pass California Riverside 40 High Satisfactory 1958 Flood Risk Reduction
Fay Gunby California El Dorado 40 High Satisfactory 1961 Water Supply
Lower Blue Lake California Alpine 40 Low Poor 1885 Hydroelectric
Lower Pond / Pond 1 California Sacramento 40 High Not Available — Water Supply
Collett California Lassen 40 Significant Satisfactory 1991 Hydroelectric
Bean Holl #3 California San Mateo 40 Low Poor 1939 Water Supply
Lake County Sanitation District California Lake 40 High Satisfactory 1972 Water Supply
Rubicon Main California El Dorado 40 Low Satisfactory 1963 Hydroelectric
Las Tablas Creek California San Luis Obispo 40 Low Poor 1961 Other
Upper Sand Creek Detention Basin California Contra Costa 40 High Satisfactory 2014 Flood Risk Reduction
San Joaquin No. 3 Forebay California Madera 40 Low Fair 1906 Hydroelectric
Patterson California Alameda 39 High Fair 1962 Water Supply
Schadler California Modoc 39 Low Satisfactory 1967 Other
Mendocino Middle California Mendocino 39 High Poor 1908 Other
Graham California Lake 39 Low Satisfactory 1959 Water Supply
Burns California Napa 39 Significant Satisfactory 1956 Water Supply
Araujo Reservoir No. 1 California Napa 39 High Fair 1950 Other
Ler Howell California Santa Clara 39 Significant Satisfactory 1877 Water Supply
Winchester California Placer 39 Significant Satisfactory 1999 Water Supply
Montana Lake California Napa 39 Low Satisfactory 2009 Other
Linda Vista California Napa 39 Significant Satisfactory 1959 Water Supply
Boron Tails Pond 6 California Kern 39 Low Satisfactory 1980 Water Supply
Lake Helen California Sonoma 39 High Poor 1966 Water Supply
Fleming Hill No. 2 California Solano 39 High Satisfactory 1912 Water Supply
Sleepy Holl No. 2 California Sonoma 39 High Satisfactory 1949 Water Supply
Summit Reservoir California San Francisco 39 High Satisfactory 1954 Water Supply
Eastfoot Retarding Basin California Orange 39 High Satisfactory 2007 Flood Risk Reduction
Heenan Lake California Alpine 39 Low Satisfactory 1929 Water Supply
Grizzly Creek California Plumas 39 High Satisfactory 1915 Other
Green Oaks #1 California San Mateo 39 Low Satisfactory 1936 Other
Penn Valley Wastewater California Nevada 39 Low Satisfactory 1990 Water Supply
Fuller Lake California Nevada 39 Low Satisfactory 1856 Hydroelectric
San Diego Reservoir California Tuolumne 39 High Satisfactory 1860 Water Supply
Holiday Lake California El Dorado 39 Significant Satisfactory 1951 Water Supply
Spring Valley Ranch California Placer 39 High Satisfactory 1958 Other
Auburn Valley Country Club #3 California Placer 39 Low Satisfactory 1959 Water Supply
Upper Peak Lake California Placer 39 High Satisfactory 1850 Hydroelectric
Thermalito Afterbay California Butte 39 High Fair 1967 Water Supply
Goffinet California Amador 38 High Satisfactory 1954 Other
Reservoir No. 4 California Los Angeles 38 High Satisfactory 1955 Water Supply
Big Four Ranch California Kern 38 Significant Satisfactory 1970 Water Supply
E. A. Wright California Glenn 38 Significant Satisfactory 1950 Water Supply

Frequently Asked Questions

Hazard potential is based on the consequences of dam failure, not the condition of the dam. High hazard means loss of human life is probable. Significant means economic and environmental losses are expected but no probable loss of life. Low means minimal losses are expected. The classification considers downstream population, infrastructure, and environmental resources.

Condition ratings reflect the physical state of the dam based on periodic inspections. Satisfactory means no deficiencies found. Fair means minor issues exist but no immediate action needed. Poor means safety deficiencies require remedial action. Unsatisfactory means the dam is unsafe and immediate corrective action is required.

Yes. Use the search field above to find dams by name. You can also combine the search with state, hazard, and condition filters to narrow your results. Each dam record links to a detail page with complete information.