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Browse Dams

835 dams in the National Inventory of Dams.

National Inventory of Dams

Browse 835 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.

Name State County Height (ft) Hazard Condition Year Purpose
Mossyrock Washington Lewis 606 High Unsatisfactory 1968 Hydroelectric
Grand Coulee Dam Washington Okanogan 550 High Not Available 1941 Flood Risk Reduction
Ross Washington Whatcom 540 High Satisfactory 1949 Hydroelectric
Mud Mountain Dam Washington King 425 High Not Available 1948 Flood Risk Reduction
Swift No. 1 Washington Skamania 412 High Fair 1958 Hydroelectric
Diablo Washington Whatcom 389 High Satisfactory 1929 Hydroelectric
Boundary Washington Pend Oreille 360 High Fair 1967 Hydroelectric
Asamera Cannon Mine Tailings Dam Washington Chelan 340 High Satisfactory 1986 Flood Risk Reduction
Alder Washington Pierce 330 High Satisfactory 1945 Hydroelectric
Yale Washington Cowlitz 323 High Fair 1953 Hydroelectric
Tieton Dam Washington Yakima 319 High Not Available 1925 Flood Risk Reduction
Merwin Washington Cowlitz 313 High Fair 1931 Hydroelectric
Upper Baker Washington Whatcom 312 High Fair 1959 Hydroelectric
Gorge Washington Whatcom 300 High Satisfactory 1961 Hydroelectric
Lower Baker Washington Skagit 285 High Poor 1927 Hydroelectric
Centralia Coal Mine Dam No 3d Washington Lewis 285 Low — 1988 Tailings
Cushman No 2 Washington Mason 275 High Satisfactory 1930 Hydroelectric
Cushman No 1 Washington Mason 272 High Fair 1926 Hydroelectric
Culmback Washington Snohomish 262 High Satisfactory 1983 Hydroelectric
Tapps Lake Dike No 14 Washington Pierce 256 Low Satisfactory 1911 Recreation
Mayfield Washington Lewis 250 High Unsatisfactory 1963 Hydroelectric
Mount St. Helens Sediment Retention Structure Washington Cowlitz 239 High Not Available 1988 Flood Risk Reduction
Howard A. Hanson Dam Washington King 235 High Not Available 1962 Flood Risk Reduction
Chief Joseph Dam Washington Douglas 230 High Not Available 1955 Hydroelectric
Masonry Dam Washington King 230 High Satisfactory 1914 Hydroelectric
Lower Granite Lock and Dam Washington Whitman 228 High Not Available 1975 Navigation
Lower Monumental Lock and Dam Washington Franklin 226 High Not Available 1969 Navigation
Little Goose Lock and Dam Washington Columbia 226 High Not Available 1970 Navigation
Long Lake Washington Stevens 225 High Fair 1915 Hydroelectric
La Grande Washington Thurston 217 High Satisfactory 1944 Hydroelectric
Ice Harbor Lock and Dam Washington Walla Walla 208 High Not Available 1962 Navigation
Wanapum Washington Kittitas 206 High Fair 1965 Hydroelectric
O'Sullivan Dam Washington Grant 200 High Not Available 1949 Flood Risk Reduction
Coldwater Debris Dam Washington Cowlitz 200 Undetermined Not Rated 1981 Other
Tolt River - South Fork Washington King 200 High Fair 1962 Water Supply
Castle Lake Debris Dam Washington Cowlitz 190 Undetermined Not Rated 1980 Other
Casad Dam Washington Kitsap 190 High Fair 1956 Water Supply
Kinross Gold Kettle River Tailings Dam Washington Ferry 189 High Satisfactory 1994 Tailings
Priest Rapids Washington Grant 187 High Fair 1961 Hydroelectric
Spirit Lake Outlet Tunnel Washington Skamania 184 Undetermined Not Rated 1985 Flood Risk Reduction
Wynoochee Washington Grays Harbor 175 High Satisfactory 1972 Water Supply
Cle Elum Dam Washington Kittitas 165 High Not Available 1933 Flood Risk Reduction
Skookumchuck Washington Thurston 160 High Satisfactory 1970 Hydroelectric
Wells Washington Chelan 160 High Poor 1968 Hydroelectric
North Dam Washington Grant 145 High Not Available 1951 Flood Risk Reduction
Mill Creek Storage Dam Washington Walla Walla 145 High Not Available 1942 Flood Risk Reduction
Cowlitz Falls Washington Lewis 145 Significant Satisfactory 1994 Hydroelectric
Centralia Coal Mine Dam No 3b Washington Lewis 140 Significant Fair 1980 Tailings
Icon Materials Pond 4 Washington King 140 High Fair 1997 Water Supply
Centralia Coal Mine Dam No 3c North Washington Lewis 134 Significant Satisfactory 1987 Tailings

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.