Reservoir report
Washington reservoirs & dams
Every documented dam and reservoir in Washington — with normal storage capacity, dam height, max discharge, hazard classification, and drainage area. Sourced from USACE NID and state water-resource agencies.
Dams in Washington
824
Total storage
30,164,751ac·ft
High-hazard dams
417
Updated
May 15
Open the Washington reservoir layer on the map
Every dam and reservoir filtered to Washington on the interactive map.
Open the map →
May
15
2026
Reservoir report
Washington state has over 700 dams and reservoirs, many of which provide hydroelectric power and irrigation for agriculture. The Columbia River is the largest source of water for the state, with many major reservoirs located along its length. These include Grand Coulee, Banks Lake, and Lake Roosevelt. The Yakima River basin also has several important reservoirs, including Cle Elum Lake, Kachess Lake, and Bumping Lake. Snowpack in the Cascades and Olympics is critical for water supply, particularly for irrigation during the dry summer months. In recent years, drought conditions have affected much of the state, with record low snowpack levels in 2015 leading to restrictions on water use. Seasonal trends generally see peak water levels in the spring as snowmelt increases streamflow, followed by a gradual decline throughout the summer and fall. Overall, the hydrology of Washington is complex, with a mix of natural and human factors affecting the availability and use of water resources.
Washington at a glance
Storage, hazard, and history
How the Washington dam inventory breaks down -- aggregate stats computed across every documented dam in the state.
Hazard classification
- High417
- Significant95
- Low309
- Unknown3
USACE downstream-consequence rating, not failure likelihood.
Notable dams
- Tallest Grand Coulee 550 ft
- Oldest Clear Lake Dam 1888
- Total storage All Washington dams 30,164,751 ac·ft
Built by decade
Most U.S. dams were built mid-20th century during the federal water-development era.
Full inventory
Washington dams & reservoirs
Every documented dam in Washington. Sortable by any column; quickly filterable by name. Numeric columns heat-mapped from light to deep based on value. Tap any dam for the full report.
| Name | Year built | Normal storage | Dam height | Max discharge | Hazard | Drainage area |
|---|---|---|---|---|---|---|
| Wenas Dam | 1911 | 3,200 | · | 29,000 | High | 114 |
| Chelan | 1927 | 676,100 | 33 | 39,100 | Significant | 952 |
| Sinlahekin Dam No 3 | 1950 | 304 | · | 0 | High | 70 |
| Sinlahekin Dam No 2 | 1949 | 52 | · | 0 | High | 64 |
| Sinlahekin Dam No 1 | 1949 | 175 | · | 0 | High | 64 |
| Boundary | 1967 | 95,000 | 340 | 360,000 | High | 25,200 |
| Power Lake Dam | 1922 | 1,000 | · | 11,300 | High | 56 |
| Mill Pond | 1922 | 1,430 | 55 | 4,000 | High | 125 |
| Mill Pond Dike | 1922 | 1,430 | 8 | 4,000 | High | 125 |
| Sullivan Lake | 1923 | 31,000 | 25 | 4,000 | High | 51 |
| Box Canyon | 1955 | 36 | 105 | 350,000 | High | 24,900 |
| Box Canyon Forebay Dam | 1955 | 36 | 32 | · | Low | 24,900 |
| Calispell Creek Dike And Pump Plant | · | 36 | 28 | · | High | · |
| Stemilt Main Dam | 1962 | 580 | · | 20 | High | 0 |
| Wood Reservoir Dam No 1 | 1991 | 41 | · | 5 | High | 0 |
| Hansen Dam | 1962 | 20 | · | 725 | Low | 12 |
| Mcdonald Dam | 1924 | 200 | · | 0 | Low | 27 |
| Mckay Dam | 1961 | 19 | · | 39 | Low | 1 |
| Locke Dam | 1973 | 1,000 | · | 174 | High | 1 |
| Meyers Falls | 1961 | 32 | 21 | 5,450 | Low | 1,007 |
| Long Lake | 1915 | 105,080 | 213 | 269,200 | High | 5,844 |
| Long Lake Crescent | 1915 | 105,080 | 108 | · | High | 5,844 |
| Con Agra Foods Main Storage Basin Dam | 1970 | 84 | · | 160 | Low | 0 |
| Sims Dam | 1960 | 187 | · | 210 | Low | 2 |
| Jorgensen Dam | 1946 | 30 | · | 41 | Low | 1 |
| Jenkins Webley Dam | 1945 | 586 | · | 254 | Low | 6 |
| Coffin Sheep Dam No 3 | 1938 | 0 | · | 0 | Low | 42 |
| Mountain Meadows Lake Dam | 1959 | 1,000 | · | 0 | High | 1 |
| Scabrock Feeders Dam 3 | 1968 | 64 | · | 33 | Low | 0 |
| Taggares Dam No 2 | 1968 | 95 | · | 33 | Low | 0 |
| Taggares Dam No 1 | 1968 | 60 | · | 33 | Low | 0 |
| Homestead Lake Dam | 1971 | 30 | · | 20 | Low | 0 |
| Lower Rimrock Dam | 1972 | 550 | · | 22,400 | Low | 256 |
| Moran Slough Dike | 1964 | 75 | 11 | · | Low | 1 |
| Upper Falls Control Works | 1922 | 800 | 24 | 38,000 | Low | 4,255 |
| Upper Falls Intake Dam | 1922 | 800 | 18 | 0 | Low | 4,255 |
| Fanchers Dam | 1926 | 500 | · | 330 | High | 34 |
| Ponderosa Lake Dam | 1969 | 357 | · | 500 | High | 8 |
| Mcdowell Lake Dam | 1973 | 480 | · | 197 | Low | 2 |
| Lyon Lake Dam | 1971 | 50 | · | 0 | Low | 3 |
| Duncan Dam No 2 | 1966 | 95 | · | 139 | Low | 1 |
| Duncan Dam No 1 | 1966 | 96 | · | 0 | Low | 1 |
| Cedar Lake Dam | 1967 | 21 | 19 | 355 | High | 0 |
| Miller Reservoir Dam | 1959 | 62 | · | 82 | Low | 0 |
| Dosser Reservoir Dam | 1959 | 42 | · | 597 | Low | 6 |
| Reflection Lake South Dam | 1955 | 490 | · | 11 | High | 1 |
| Bonaparte Lake Dam | 1957 | 535 | · | 0 | Low | 7 |
| Schallow Lake Dam | 1954 | 46 | · | 142 | Low | 13 |
| Moccasin Lake Dam | 1969 | · | · | 35 | High | 1 |
| Beehive Dam | 1953 | 260 | · | 130 | High | 0 |
| Hog Lake Dam | 1957 | 280 | · | 4,050 | High | 48 |
| Byron Ponds Dam | 1950 | 100 | · | 0 | Low | 1 |
| Blair Reservoir Dam | 1937 | 0 | · | 250 | High | 3 |
| Serenity Lake Dam | 1972 | 115 | · | 300 | High | 5 |
| Sherry Lake Dam | 1952 | 26 | · | 1,000 | Low | 15 |
| Beitey Lake Dam | 1934 | 100 | · | 160 | High | 3 |
| Sowers Reservoir Dam | 1958 | 23 | · | 250 | Low | 8 |
| Snook Lake Dam | 1953 | 50 | · | 0 | Low | 0 |
| Nine Mile | 1908 | 4,600 | 58 | 60,000 | High | 4,998 |
| Little Falls Dam | 1910 | 2,220 | · | 72,398 | High | 5,844 |
| Higginbotham Reservoir Dam | 1947 | 145 | · | 227 | Low | 14 |
| Billingsley Dam | 1949 | 0 | · | 273 | Low | 9 |
| Meadow Lake Dam | 1920 | 360 | · | 300 | High | 5 |
| Patterson Lake Dam | 1924 | 2,500 | · | 260 | High | 6 |
| Upriver Dam | 1937 | 3,000 | 38 | 58,000 | High | 4,057 |
| Upriver Dam Forebay | 1987 | 3,000 | 30 | · | Significant | 4,057 |
| Rearing Pond Dike | 1964 | 48 | · | 0 | Low | 1 |
| Yergens & Anselmo Dam No 1 | 1970 | 45 | · | 47 | Low | 0 |
| Upper Wheeler Dam | 1922 | 633 | · | 2,500 | High | 2 |
| Little Green Lake Dam | 1959 | 50 | · | 0 | High | 2 |
| Antilon Lake Dam | 1913 | 1,920 | · | 360 | High | 2 |
| Rock Island | 1932 | 113,700 | 71 | 920,000 | High | 89,400 |
| Wanapum | 1965 | 590,000 | 93 | 1,400,000 | High | 95,000 |
| Rocky Reach | 1962 | 382,000 | 118 | 1,200,000 | High | 87,800 |
| Mill Pond Dam Klickitat Co | 1951 | 100 | · | 500 | Low | 124 |
| Priest Rapids | 1961 | 191,000 | 90 | 1,334,992 | High | 95,500 |
| Timberlakes Dam | 1968 | 828 | · | 404 | High | 2 |
| Little Twin Lakes Dam | 1966 | 77 | · | 21 | Low | 0 |
| Fawn Lake Dam | 1966 | 580 | · | 80 | Low | 1 |
| Tempo Lake Dam | 1960 | 400 | · | 39 | Low | 1 |
| Kaufman Dam | 1967 | 65 | · | 50 | Low | 0 |
| Serene Lake | 1971 | 36 | · | 18 | Low | 0 |
| Frozen Lake Dam | 1930 | 0 | 14 | · | High | · |
| Enloe Dam | 1920 | 2,400 | · | 46,000 | High | 3,590 |
| Wells | 1968 | 331,000 | 160 | 1,180,000 | High | 85,300 |
| Lacamas & Round Lakes Lower Dam | 1936 | 6,100 | · | 20 | Low | 65 |
| Sea Horse Ranch Dike | 1961 | 75 | · | 0 | Low | 0 |
| Erickson Dam | 1968 | 125 | · | 102 | High | 2 |
| Tri Mountain Estates Dam | 1953 | 137 | · | 125 | High | 0 |
| Long Bell Mill Pond Dam | 1943 | 55 | · | 0 | Low | 8 |
| Powell Dam | 1963 | 63 | · | 0 | Low | 3 |
| Koa Dam No 1 | 1965 | 50 | · | 162 | Low | 1 |
| Failor Lake Dam | 1956 | 394 | · | 66 | Low | 5 |
| Aberdeen Lake Dam | 1928 | 700 | · | 1,975 | High | 5 |
| Leprechaun Lake Dam | 1966 | 38 | · | 135 | High | 0 |
| Anderson Lake Dam | 1966 | 370 | · | 520 | High | 1 |
| Sylvia Lake Dam Pierce Co | 1963 | 60 | · | 160 | Significant | 1 |
| Rolland Lake Dam | 1967 | 130 | · | 0 | Low | 0 |
| Christine Lake Dam | 1967 | 104 | · | 180 | Low | 1 |
| Lacamas & Round Lakes Upper Dam | 1936 | 6,100 | · | 1,220 | High | 65 |
| Durhack Dam No 5 | 1972 | 198 | · | 63 | Low | 1 |
| Durhack Dam No 4 | 1968 | 125 | · | 0 | Low | 0 |
| Durhack Dam No 3 | 1968 | 125 | · | 0 | Low | 0 |
| Durhack Dam No 2 | 1968 | 125 | · | 58 | Low | 0 |
| Durhack Dam No 1 | 1968 | 125 | · | 0 | Low | 0 |
| Burton & Louthan Dam | 1973 | 77 | · | 24 | Low | 0 |
| Woods Reservoir Dam | 1972 | 210 | · | 255 | Low | 0 |
| Utter Dam | 1971 | 73 | · | 57 | Low | 0 |
| Moses Lake South | 1962 | 50,000 | 12 | · | Low | · |
| Moses Lake North Dam | 1930 | 50,000 | · | 500 | Low | 3,080 |
| Limerick Lake Dam | 1966 | 920 | · | 1,710 | High | 11 |
| Camp Kwoneesum Dam | 1964 | 102 | · | 5,935 | High | 3 |
| Sylvia Lake Dam Grays Harbor Cnty | 1918 | 320 | · | 1,510 | High | 5 |
| Surge Pond Dam | 1971 | 20 | · | 41 | Low | 15 |
| Swofford Pond | · | 1,500 | 20 | 0 | Low | · |
| Chambers Creek Reservoir Dam | 1970 | 89 | · | 1,120 | Low | 108 |
| Kristofferson Lake Dam | 1961 | 100 | · | 0 | Low | 1 |
| Steilacoom Lake Dam | 1989 | 2,640 | · | 1,980 | High | 62 |
| Nookachamps Hills Dam | 1969 | 118 | · | 169 | Significant | 0 |
| Silver Lake Dam | 1971 | 7,500 | · | 1,783 | Low | 39 |
| Deschutes Dam | 1951 | 3,700 | · | 0 | Low | 185 |
| Cushman No 1 | 1926 | 453,350 | 235 | · | High | 95 |
| Cushman No. 1 Spillway | 1990 | 453,350 | 46 | 41,000 | High | 95 |
| Cushman No 2 | 1930 | 8,000 | 175 | 41,050 | High | 103 |
| Swift No. 1 | 1958 | 755,500 | 412 | 184,300 | High | 477 |
| Yale | 1953 | 402,000 | 323 | 170,000 | High | 592 |
| Yale Saddle Dam | 1953 | 402,000 | 40 | · | High | 592 |
| Merwin | 1931 | 422,000 | 313 | 120,000 | High | 726 |
| Packwood Lake | 1964 | 3,500 | 14 | 7,800 | Low | 20 |
| Mossyrock | 1968 | 1,700,000 | 366 | 280,000 | High | 1,042 |
| Mayfield | 1963 | 133,718 | 200 | 313,000 | High | 1,392 |
| Mayfield Forebay Dam | 1963 | 133,718 | 47 | · | Low | 1,392 |
| Skookumchuck | 1970 | 35,000 | 160 | 28,000 | High | 62 |
| Devils Hole Dam | 1959 | 87 | 22 | 441 | Low | 2 |
| Barnaby Slough No 2 Dam | 1968 | 124 | · | 0 | Low | 4 |
| Loers Dam | 1958 | 37 | · | 54 | Low | 3 |
| Whatcom Lake Dam | 1937 | 25,000 | · | 7,000 | High | 56 |
| Unruh Reservoir Dam | 1959 | 18 | · | 325 | Low | 0 |
| Goodrow Dam | 1964 | 38 | · | 300 | Low | 0 |
| Erickson Dam No 2 | 1964 | 47 | · | 0 | Low | 0 |
| Zylstra Dam No 2 | 1963 | 280 | · | 117 | Low | 9 |
| Martins Lake Dam | 1962 | 223 | · | 0 | Low | 0 |
| Ayer Reservoir Dam | 1964 | 125 | · | 21 | Low | 1 |
| Fowler Reservoir Dam | 1960 | 42 | · | 60 | Low | 1 |
| Heidenreich Dam | 1972 | 92 | · | 74 | Low | 0 |
| Gorge | 1961 | 8,485 | 300 | 145,000 | High | 1,193 |
| Ross | 1949 | 1,435,000 | 540 | 85,000 | High | 978 |
| Diablo | 1929 | 50,000 | 389 | 105,300 | High | 1,160 |
| Casad Dam | 1956 | 4,260 | · | 520 | High | 3 |
| Lower Baker | 1927 | 146,279 | 285 | 54,000 | High | 297 |
| Upper Baker | 1959 | 274,221 | 312 | 69,000 | High | 215 |
| West Pass Dike | 1959 | 274,221 | 115 | · | High | 215 |
| Louise Lake Dam | 1972 | 1,070 | · | 50 | High | 0 |
| Erickson Dam No 1 | 1964 | 47 | · | 46 | Low | 0 |
| Tolt River - South Fork | 1962 | 57,500 | 200 | 13,000 | High | 19 |
| Butterworth Dam | 1949 | 2,050 | · | 25 | Significant | 1 |
| Eden Creek Dam | 1937 | 77 | · | 75 | Low | 0 |
| Tuck Lake Dam | 1966 | 170 | · | 70 | High | 1 |
| Judy Reservoir Dam B | 1946 | 4,300 | · | 55 | High | 2 |
| Skagit Lake Dam | 1971 | 258 | · | 166 | Low | 1 |
| Judy Reservoir Dam A | 1946 | 4,420 | · | 58 | High | 2 |
| Lummi Island Estates Dam | 1963 | 49 | · | 35 | High | 0 |
| Lawson Lake Dam | 1948 | 65 | · | 10 | Low | 0 |
| Radar Lake Dam | 1973 | 68 | · | 5 | High | 0 |
| Loutsis Dam | 1970 | 97 | · | 97 | Low | 1 |
| Tahuyeh Lake Dam | 1961 | 1,100 | · | 1,950 | High | 6 |
| Lewis Dam | 1973 | 300 | · | 0 | Low | 14 |
| William Symington Dam | 1965 | 670 | · | 2,400 | High | 7 |
| Weyerhaeuser Dam | 1970 | 57 | · | 105 | Low | 1 |
| Jean Lake Dam | 1963 | 100 | · | 41 | Low | 1 |
| Loreene Lake Dam | 1963 | 70 | · | 40 | Low | 1 |
| Welcome Lake Dam | 1959 | 130 | · | 1,700 | High | 2 |
| Crystal Lake Dam | 1931 | 150 | · | 300 | High | 3 |
| Chaplain Lake North Dam | 1940 | 16,200 | · | 660 | High | 3 |
| Chaplain Lake South Dam | 1930 | 16,200 | · | 660 | High | 3 |
| Dagger Lake Dam | 1912 | 400 | · | 0 | Low | 1 |
| Kayak Lake Dam | 1965 | 130 | · | 44 | High | 0 |
| Marcel Lake Dam | 1964 | 280 | · | 1,300 | High | 2 |
| Lake Kittyprince Dam | 1967 | 62 | · | 0 | High | 0 |
| Trout Lake Storage Dam | 1929 | 1,440 | · | 960 | High | 1 |
| Honeymoon Lake Dam | 1969 | 42 | · | 200 | High | 2 |
| Three Rivers Mill Pond Dam | 1946 | 42 | · | 0 | Low | 0 |
| Rainbow Springs Dam | 1969 | 43 | · | 77 | High | 1 |
| Glenhaven Lakes Dam | 1963 | 125 | · | 134 | Low | 2 |
| Culmback | 1983 | 153,260 | 262 | 57,132 | High | 68 |
| Youngs Lake Cascades Dam | 1950 | 33,760 | · | 0 | Significant | 2 |
| Seattle City Volunteer Park Reservoir | 1901 | 55 | · | 95 | High | 0 |
| Roosevelt Reservoir | 1910 | 153 | · | 45 | High | 0 |
| Bitter Lake Reservoir | 1958 | 65 | · | 4 | High | 0 |
| Lake Forest Park Reservoir | 1962 | 184 | · | 10 | High | 0 |
| Ringold Pond Dam | 1962 | 60 | · | 0 | Low | 0 |
| Berger Dam | 1970 | 55 | · | 106 | High | 1 |
| Duncan Creek Dam | 1963 | 260 | · | 428 | Low | 6 |
| Carlisle Lake Dam | 1920 | 150 | · | 0 | High | 4 |
| Leader Lake Dam | 1910 | 5,900 | · | 470 | High | 3 |
| Square Lake Dam | 1938 | 674 | · | 0 | High | 1 |
| Klonaqua Lake Dam | 1933 | 1,172 | · | 0 | High | 1 |
| Colchuck Lake Saddle Dam | 1930 | 1,240 | · | 0 | Low | 1 |
| Colchuck Lake Dam | 1930 | 1,064 | · | 0 | High | 1 |
| Eightmile Lake Outlet Dam | 1933 | 1,610 | · | 0 | High | 6 |
| Clear Lake Dam | 1888 | 40 | · | 50 | High | 0 |
| Lily Lake Dam | 1892 | 350 | · | 47 | High | 0 |
| Three Lakes Reservoir Dam | 1908 | 600 | · | 0 | Low | 0 |
| Spring Hill Dam | 1918 | 460 | · | 95 | High | 0 |
| Margaret Lake Dam | 1933 | 820 | · | 750 | High | 3 |
| Regulating Basin West Dam | 1962 | · | 32 | 45 | High | 1 |
| Regulating Basin South Dam | 1962 | · | 35 | 0 | High | 250 |
| West Hills Stormwater Pond Dam | 2006 | 1 | · | 0 | High | 1 |
| Lords Lake North Dam | 1957 | 1,480 | · | 250 | High | 1 |
| Melbourne Lake Dam | 1957 | 136 | · | 0 | Low | 2 |
| Ringold Springs Fish Pond | 1961 | 44 | · | 0 | Low | 0 |
| La Grande | 1944 | 2,700 | 192 | 88,000 | High | 292 |
| Youngs Lake Outlet Dam | 1921 | 33,760 | · | 30 | High | 2 |
| Masonry Dam | 1914 | 90,660 | · | 74,400 | High | 81 |
| Morse Lake Overflow Dike | 1904 | 75,000 | · | 0 | Low | 81 |
| Alder | 1945 | 214,500 | 285 | 80,000 | High | 286 |
| Swift No 2 Hydroelectric Project | 1959 | 2,400 | 106 | 8,000 | Low | · |
| Conconully | 1909 | 13,000 | 72 | 11,580 | High | 5 |
| Kachess | 1912 | 239,000 | 63 | 5,516 | High | 64 |
| Dry Falls | 1949 | 1,275,000 | 63 | · | High | 263 |
| Grand Coulee | 1941 | 9,562,000 | 550 | 265,000 | High | 74,100 |
| Bumping Lake | 1910 | 33,700 | 44 | 3,400 | High | 69 |
| Clear Creek | 1914 | 3,500 | 47 | 2,400 | High | 60 |
| Keechelus | 1917 | 158,000 | 71 | 11,800 | High | 55 |
| North | 1950 | 1,275,000 | 145 | · | High | 263 |
| Osullivan | 1948 | 511,700 | 200 | 30,850 | High | 4,000 |
| Pinto | 1948 | 64,200 | 111 | 15,800 | High | 186 |
| Lower Monumental Lock And Dam | 1969 | 377,000 | 0 | 850,000 | High | 108,500 |
| Soda Lake Dike | 1952 | 10,150 | 59 | · | Low | · |
| Spectacle Lake Dike | 1969 | 13,450 | 25 | · | Low | 5 |
| Tieton | 1925 | 198,000 | 196 | 45,700 | High | 119,000 |
| Cle Elum | 1932 | 437,000 | 124 | 40,000 | High | 206 |
| Cle Elum Main Dike | 1932 | 437,000 | · | · | High | · |
| Cle Elum Dike 1 | 1932 | 437,000 | 13 | · | Low | · |
| Cle Elum Dike 2 | 1932 | 437,000 | 13 | · | Low | · |
| Cle Elum Dike 3 | 1932 | 437,000 | 13 | · | Low | · |
| Roza Diversion | 1939 | 100 | 32 | 50,000 | Low | 1,785 |
| Easton Diversion | 1929 | 4,000 | 66 | 15,000 | High | 185 |
| Twin Lakes | 1940 | 60,000 | · | · | High | · |
| Owhi | 1915 | 3,000 | · | · | High | · |
| Mountain Lake Dam | 1905 | 2,870 | · | 200 | High | 2 |
| Gardner Dam | 1961 | 40 | · | 0 | Low | 0 |
| Cascade Lake Dam | 1915 | 1,700 | · | 130 | High | 3 |
| Cranberry Lake Dam | 1910 | 178 | · | 29 | High | 1 |
| Everett Reservoir No 3 | 1923 | 61 | · | 0 | High | 0 |
| Everett Reservoir No 4 | 1952 | 74 | · | 0 | High | 0 |
| Parker Reservoir Dam | 1955 | 46 | · | 570 | High | 1 |
| Centralia Coal Mine Dam No 5c | 1970 | 52 | · | 90 | Low | 0 |
| Centralia Coal Mine Dam No 3a | 1970 | 60 | · | 98 | Low | 0 |
| Centralia Coal Mine Dam No 6b | 1970 | 62 | · | 69 | Low | 0 |
| Salmon Lake | 1920 | 15,700 | 54 | 400 | High | 6 |
| Centralia Coal Mine Dam No 5 | 1971 | 95 | · | 356 | Low | 0 |
| Centralia Coal Mine Dam No 8a | 1972 | 59 | · | 2,897 | Significant | 2 |
| Centralia Coal Mine Dam No 8 | 1972 | 15 | · | 1,310 | Significant | 2 |
| Snoqualmie Falls | 1898 | 566 | 19 | 10,000 | Low | 400 |
| Tapps Lake Dike No 4 | 1911 | 56,000 | · | 0 | High | 10 |
| Howard A. Hanson Dam | 1962 | 26,000 | 0 | 129,000 | High | 221 |
| Chief Joseph Dam | 1955 | 516,000 | 0 | 1,200,000 | High | 75,400 |
| Mud Mountain Dam | 1948 | 0 | 0 | 156,000 | High | 400 |
| Hiram M. Chittenden Locks And Dam | 1916 | 458,000 | 0 | 16,000 | High | 607 |
| Wynoochee | 1972 | 69,405 | 175 | 52,500 | High | 41 |
| Chapman Lake Dam | 1940 | 7,500 | · | 5,000 | Low | 49 |
| Wandermere Lake Dam | 1930 | 45 | · | 0 | Low | 0 |
| Coweeman Gravel Pit No. 2 Dam | 1962 | 165 | · | 100 | Low | 0 |
| Snoqualmie Mill Pond Dam | 1917 | 330 | · | 45 | Low | 375 |
| Rabel Dam | 1940 | 100 | · | 100 | High | 7 |
| Waterville Sewage Treatment Pond | 1954 | 40 | · | 8 | Low | 0 |
| Black Lake Dam | 1938 | 200 | · | 225 | Low | 0 |
| Alkali Lake | 1950 | 2,000 | · | 110 | Low | 79 |
| Columbia Marsh Unit #1 Dam | 1958 | 325 | 20 | 1,018 | Low | 5 |
| Lower Pine Lake Dam | 1940 | 152 | 14 | 4,197 | Low | 34 |
| Rainbow Lake Dam | 1955 | 50 | · | 0 | Low | 0 |
| Hawkins Dam | 1940 | 35 | · | 200 | High | 8 |
| Wapato Lake Dam | 1912 | 2,000 | · | 40 | High | 15 |
| Fish Lake Dam | 1920 | 2,815 | · | 0 | Low | 11 |
| Sasse Reservoir Dam | 1910 | 60 | · | 150 | Low | 4 |
| Blue Lake Dam Okanogan Co | 1923 | 4,416 | · | 0 | Low | 10 |
| Whitestone Lake Dam | 1930 | 2,144 | · | 825 | Low | 14 |
| Chalfa Dam | 1940 | 50 | · | 100 | High | 7 |
| Beth Lake | · | · | 15 | 0 | Significant | · |
| Texas Pond | 1970 | 0 | · | 424 | Low | 0 |
| Little Goose Lock And Dam | 1970 | 565,200 | 0 | 850,000 | High | 103,900 |
| Davis Lake Dam Okanogan Co | 1974 | 500 | · | 0 | Low | 2 |
| Ione Mill Pond | 1914 | 500 | · | 0 | Low | 29 |
| Conger Lake Dam | 1926 | 50 | · | 0 | Low | 15 |
| D1 Big Meadow Lake Dam | 1975 | 144 | 15 | 0 | Significant | 3 |
| Ravensdale Pit | 1972 | 120 | · | 0 | Low | 1 |
| Teal Duck Slough Dam | 1960 | 10 | · | 0 | Low | 1 |
| Malinowski Dam | 1963 | 120 | · | 10,300 | High | 11 |
| Dragoon Lake Dam | 1913 | 157 | · | 0 | Low | 17 |
| Ice Harbor Lock And Dam | 1962 | 406,500 | 0 | 850,000 | High | 103,200 |
| Mill Creek Storage Dam | 1942 | 3,300 | 0 | 17,000 | High | 80 |
| Mill Creek Storage Dam - Diversion Dam | 1942 | 0 | 0 | 0 | Significant | 0 |
| Lower Granite Lock And Dam | 1975 | 485,000 | 0 | 850,000 | High | 103,200 |
| Lower Granite Lock And Dam - North Levee | 1974 | 0 | 0 | 0 | High | 0 |
| Lower Granite Lock And Dam - West Levee | 1974 | · | · | · | High | · |
| Lower Granite Lock And Dam - East Levee | · | · | · | · | High | · |
| Bennettsen Lake Dam | 1971 | 253 | · | 37 | Low | 0 |
| Marshall Lake Dam | 1912 | 1,292 | · | 133 | High | 5 |
| Berge Reservoir Dam | 1954 | 26 | · | 74 | Low | 1 |
| Chambers Lake | 1967 | 320 | 7 | 400 | Low | · |
| Lords Lake East Dam | 1956 | 1,480 | · | 190 | High | 1 |
| Leader Lake Saddle Dam | 1910 | 1,000 | · | 0 | High | 3 |
| Spring Hill Saddle Dam | 1918 | 280 | · | 0 | High | 0 |
| Beehive Saddle Dam | 1953 | 260 | · | 130 | High | 0 |
| Reflection Lake North Dam | 1955 | 490 | · | 13 | High | 1 |
| Stemilt Saddle Dam | 1962 | 100 | · | 20 | High | 0 |
| Padden Lake Dam | 1933 | 4,300 | · | 465 | High | 3 |
| Ruth Lake Dam | 1977 | 75 | 18 | 0 | Low | 11 |
| Dohman Creek Dam | 1978 | 60 | · | 50 | Low | 0 |
| Jones Dam | 1977 | 42 | · | 610 | Low | 1 |
| Bernsen Dam | 1974 | 40 | 15 | 30 | Low | 1 |
| Sams Dam | 1976 | 112 | · | 118 | Low | 0 |
| Coyote Lake Dam | 1976 | 99 | 16 | 163 | Low | 5 |
| Dad's Lake Dam | 1976 | 310 | · | 800 | High | 3 |
| Merry Dam | 1976 | 66 | · | 219 | Low | 30 |
| Lenice Dam | 1976 | 110 | · | 219 | Low | 21 |
| San Refugio Ranch Dam | 1977 | 107 | · | 35 | Low | 0 |
| Hecla-Day Mine Aspen Tailings Dam | 1940 | 365 | · | 166 | Significant | 0 |
| Southwest Genesee Street Detention Dam | 1974 | 19 | · | 240 | High | 3 |
| Fire Mountain Boy Scout Camp Dam A | 1971 | 250 | · | 60 | High | 0 |
| Fire Mountain Boy Scout Camp Dam B | 1971 | 250 | · | 50 | High | 0 |
| Fire Mountain Boy Scout Camp Dam C | 1971 | 250 | · | 0 | High | 0 |
| Kettwig Wildlife Dam | 1979 | 100 | · | 0 | Low | 2 |
| Boeing Flood Control Dam | 1967 | 0 | · | 1,043 | Significant | 1 |
| Snakebite Reservoir Dam | 1976 | 50 | · | 7 | Low | 2 |
| Anderson Dam | 1987 | 112 | · | 485 | Low | 0 |
| Rock Lake Dam | 1985 | 60 | 10 | · | Low | 1 |
| Newman Lake Flood Control Dam | 1976 | 8,700 | · | 285 | High | 29 |
| K2h Farms Mcnary No 1 Reservoir | 1980 | 87 | · | 250 | Low | 0 |
| Bernsens 810 Reservoir Dam No 1 | 1979 | 100 | · | 0 | Low | 0 |
| Bernsens 810 Reservoir Dam No 2 | 1979 | 100 | · | 0 | Low | 0 |
| Bernsens 810 Reservoir Dam No 3 | 1979 | 100 | · | 0 | Low | 0 |
| Whiteman Cove Dam | 1950 | 140 | · | 440 | Low | 1 |
| Simplot Feeders Waste Pond No1 | 1973 | 75 | · | 0 | Significant | 55 |
| Carnation Waste Pond No 7 | 1979 | 71 | · | 20 | Low | 3 |
| Solmar Lake Dam | 1968 | 34 | · | 6 | High | 0 |
| Clear Lake Saddle Dam | 1888 | 45 | · | 7 | High | 0 |
| 804 Reservoir Dam | 1979 | 90 | · | 50 | Low | 0 |
| Lawrence Lake Dam | 1918 | 4,379 | · | 0 | Low | 3 |
| Youngs Lake New Inlet Dam | 1926 | 33,760 | · | 0 | High | 2 |
| Tapps Lake Dike No 1 | 1911 | 19,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 2a | 1911 | 18,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 2b | 1911 | 26,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 3 | 1911 | 26,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 5 | 1911 | 38,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 6 | 1911 | 41,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 8 | 1911 | 32,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 9 | 1911 | 24,000 | · | 0 | High | 10 |
| Tapps Lake Dike No10 | 1911 | 30,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 11 | 1911 | 36,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 12 | 1911 | 23,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 13 | 1911 | 8,000 | · | 0 | High | 10 |
| Tapps Lake Dike No 14 | 1911 | 400 | · | 0 | Low | 10 |
| Tapps Lake Dike No 15 | 1911 | 400 | · | 0 | Low | 10 |
| French Canyon | 1985 | 670 | 74 | 23,000 | High | 16 |
| Centralia Coal Mine Dam No 3b | 1980 | 230 | · | 99 | Significant | 1 |
| Sheep Springs Dam | 1906 | 120 | · | 0 | Low | 342 |
| Martin Marietta Sludge Pond | 1981 | 90 | · | 5 | Low | 0 |
| Shoecraft Lake Outlet | 1952 | 630 | · | 0 | Low | 6 |
| Horse Spring Coulee Dam | 1924 | 0 | · | 0 | Low | 3 |
| Roche Harbor Lake Dam | 2013 | 526 | · | 272 | High | 1 |
| Johnson Creek Reservoir Dam | 1982 | 100 | · | 600 | High | 2 |
| Everett Clearwell Pond Dam | 1985 | 17 | · | 250 | Low | 0 |
| Everett Washwater Storage Pond Dam | 1985 | 55 | · | 100 | Low | 0 |
| Sundstrom Dam No 2 | 1984 | 86 | · | 175 | Low | 0 |
| Goldendale Wastewater Pond 1a | 1983 | 89 | · | 20 | Low | 0 |
| Goldendale Wastewater Pond 1b | 1983 | 87 | · | 20 | Low | 0 |
| Goldendale Wastewater Pond 2 | 1983 | 89 | · | 20 | Low | 0 |
| Waterville Effluent Storage Pond | 1981 | 53 | · | 1 | Low | 0 |
| Lindblad Brothers Dam | 1940 | 0 | · | 700 | Low | 9 |
| Othello Primary Treatment Pond 1a | 1982 | 115 | · | 6 | Low | 0 |
| Othello Primary Treatment Pond 1b | 1982 | 115 | · | 16 | Low | 0 |
| Snoqualmie Pass Pud Sewage Lagoon No 1 | 1982 | 22 | · | 6 | Low | 0 |
| Educket Creek Dam | 1983 | 80 | 35 | · | Significant | · |
| Malar Dam | 1955 | 24 | · | 500 | Low | 0 |
| Bellevue Detention Pond 133 | 1983 | 61 | · | 36 | Low | 2 |
| Bellevue Detention Pond 197 | 1983 | 41 | · | 3 | Low | 2 |
| Bellevue Detention Pond 165 | 1983 | 42 | · | 31 | Low | 1 |
| Boeing Creek M1 Detention Dam | 1983 | 0 | · | 1,200 | High | 1 |
| Koreis Dam | 1982 | 52 | · | 2 | Low | 0 |
| Buck Mountain Reservoir Dam No 1 | 1985 | 121 | · | 365 | High | 1 |
| Buck Mountain Reservoir Dam No 2 | 1985 | 121 | · | 365 | High | 1 |
| Buck Mountain Reservoir Dam No 3 | 1985 | 121 | · | 365 | High | 1 |
| Wind River Logging Co Pond | 1930 | 130 | · | 0 | Low | 108 |
| Spencer Lake | 1983 | 3,038 | 42 | 200 | Low | 2 |
| Garvey Dam | 1986 | 49 | · | 110 | Low | 2 |
| Sunheaven Farms Reservoir | 1986 | 66 | · | 60 | Low | 0 |
| Asamera Cannon Mine Tailings Dam | 1986 | 2,500 | · | 3,300 | High | 2 |
| Koppert Pond | 1984 | 66 | · | 4 | High | 0 |
| Hill Lake Dam | 1984 | 80 | · | 90 | Low | 0 |
| Black Rock Orchards Dam | 1985 | 392 | · | 5,500 | High | 4 |
| Longview Sewage Lagoon No 1 | 1986 | 87 | · | 8 | Low | 0 |
| Longview Sewage Lagoon No 2 | 1986 | 36 | · | 8 | Low | 0 |
| Longview Sewage Lagoon No 3 | 1987 | 30 | · | 8 | Low | 0 |
| Longview Sewage Lagoon No 4 | 1987 | 30 | · | 8 | Low | 0 |
| Campbell Lake Dam | 1948 | 50 | · | 50 | Low | 3 |
| Ferndale Aerated Sewage Lagoon No 3 | 1986 | 35 | · | 12 | High | 0 |
| Loon Lake Waste Storage Lagoon | 1986 | 63 | · | 0 | High | 0 |
| Loon Lake Polishing Lagoon | 1986 | 35 | · | 2 | High | 0 |
| Trask Lake Dam | 1969 | 40 | · | 95 | High | 1 |
| Indian Creek Dam | 1989 | 856 | · | 1,500 | High | 856 |
| Fargher Lake Dam | 1986 | 45 | · | 34 | Low | 1 |
| Nielsen Dam A | 1950 | 45 | · | 16 | Low | 0 |
| Centralia Coal Mine Dam No 3c North | 1987 | 1,000 | · | 150 | Significant | 0 |
| Centralia Coal Mine Dam No 3c South | 1987 | 6,000 | · | 150 | Significant | 0 |
| Centralia Coal Mine Dam No 3c East | 1987 | 2,000 | · | 150 | Significant | 0 |
| Martin Dam | 1972 | 30 | · | 88 | Low | 1 |
| Brown Dam Lincoln Co | 1965 | 64 | · | 160 | Low | 8 |
| Centralia Coal Mine Dam No 20c | 1981 | 50 | · | 218 | Low | 0 |
| Kessler Dam | 1967 | 30 | · | 20 | Low | 0 |
| Snohomish Sewage Lagoon | 1958 | 120 | · | 615 | Low | 0 |
| Ely Pump Storage Dam | 1965 | 25 | · | 0 | Low | 0 |
| Blazing Tree Ranch Pond 5 South Dam | 1965 | 75 | · | 100 | Low | 1 |
| Blazing Tree Ranch Pond 5 North Dam | 1965 | 75 | · | 0 | Low | 1 |
| Swano Lake Dam | 1949 | 60 | · | 308 | High | 1 |
| Fairview Reservoir No 1 | 1915 | 28 | · | 5 | High | 0 |
| Firnstahl Dam | 1965 | 50 | · | 35 | Low | 0 |
| Squires Lake Dam | 1960 | 44 | · | 45 | Low | 0 |
| Spoils Pond Dam | 1970 | 260 | · | 2 | Low | 0 |
| Barrier Dam | 1968 | 455 | 12 | 68,350 | Low | 1,402 |
| Zosel Dam | 1986 | 272,400 | · | 18,225 | High | 3,150 |
| Mount St. Helens Sediment Retention Structure | 1988 | 0 | 186 | 228,000 | High | 143 |
| Yellow Lake Outlet Dike | 1986 | 1 | · | 85 | High | 5 |
| Davenport Sewage Lagoon No 4 | 1987 | 93 | · | 50 | High | 0 |
| Dhondt Dam | 1983 | 80 | · | 107 | Low | 0 |
| Diamond Lake Aeration Lagoon No 3 | 1987 | 0 | · | 20 | High | 0 |
| Diamond Lake Aeration Lagoon No 2 | 1987 | 0 | · | 20 | High | 0 |
| Maytown Ski Pond Dam | 1987 | 81 | · | 20 | Low | 0 |
| Centralia Coal Mine Dam No 36 | 1989 | 57 | · | 120 | Low | 0 |
| Centralia Coal Mine Dam No 36a | 1989 | 56 | · | 120 | Low | 0 |
| Garrison Creek Stormwater Detention Dam | 1991 | 2 | · | 307 | High | 1 |
| 60th Street Stormwater Detention Dam | 1988 | 10 | · | 470 | Significant | 2 |
| Thorald Dam | 1988 | 85 | · | 15 | Low | 0 |
| Centralia Coal Mine Dam No 3d | 1988 | 7,500 | · | 0 | Low | 1 |
| Cowlitz Falls | 1994 | 11,000 | 120 | 360,000 | Significant | 1,000 |
| Upper Mill Creek Stormwater Detention Da | 1990 | 133 | · | 820 | High | 1 |
| Roza Wasteway 6 Reregulation Reservoir | 1988 | 65 | · | 75 | Low | 0 |
| Centralia Coal Mine Dam No 44 | 1975 | 180 | · | 115 | Low | 2 |
| South Fork Mccorkle Creek Detention Dam | 1989 | 159 | · | 2,100 | High | 2 |
| Little Sweden Dam | 1986 | 90 | · | 10 | Low | 0 |
| Centralia Coal Mine Dam No 19 | 1977 | 105 | · | 38 | Low | 0 |
| Centralia Coal Mine Dam No 19a | 1977 | 105 | · | 54 | Low | 0 |
| Isaak Dam No 4 | 1987 | 31 | · | · | High | 150 |
| Kinross Gold Kettle River Tailings Dam | 1994 | 5,288 | · | 900 | High | 0 |
| Warman Waterski Lake Dam | 1988 | 54 | · | 20 | Low | 0 |
| Cranberry Lake Stormwater Detention Dam | 1990 | 3,100 | · | 655 | High | 7 |
| Oak Harbor Wastewater Lagoon Nw Cell | 1990 | 50 | · | 1 | Low | 0 |
| Oak Harbor Wastewater Lagoon Sw Cell | 1990 | 50 | · | 1 | Low | 0 |
| Ponderay Newsprint Mill Settling Lagoon | 1989 | 82 | · | 1 | Low | 0 |
| Klahanie Stormwater Detention Dam No 13 | 1989 | 35 | · | 30 | High | 0 |
| Carnation Potato Waste Lagoon System | 1990 | 750 | · | 1 | Low | 0 |
| Seeley Ski Lake | 1992 | 40 | · | 32 | Low | 3 |
| Centralia Coal Mine Dam No 32b | 1991 | 124 | · | 611 | Low | 2 |
| Van Stone Tailings Dam | 1970 | 20 | · | 0 | Significant | 0 |
| Tree Top Prosser Lagoons 2 & 3 | 1991 | 130 | · | 0 | Significant | 2 |
| Hannegan Road Detention Basin | 1996 | 49 | · | 1,370 | High | 2 |
| Leach Creek Stormwater Detention Dam | 1960 | 1 | · | 280 | High | 4 |
| High Woodlands Stormwater Detention Dam | 1991 | 0 | · | 50 | Low | 1 |
| Grandview Wastewater Lagoon Dam | 1991 | 60 | · | 0 | Significant | 0 |
| Sunnyside Indust Wastewater Lag 1 2 & 3 | 1992 | 465 | · | 60 | Low | 0 |
| Hilltop Waterski Pond | 1995 | 100 | · | 16 | High | 0 |
| Zintel Canyon Dam | 1992 | 1 | · | 38,900 | High | 19 |
| Miller Creek Regional Detention Facility | 1992 | 73 | · | 834 | Significant | 3 |
| Carl Malone Wildlife Pond | 1992 | 30 | · | 300 | Low | 13 |
| Pasco Industrial Wastewater System | 1995 | 132 | · | 12 | Significant | 0 |
| Upper Wheeler Saddle Dam | 1992 | 370 | · | 2,094 | High | 2 |
| Hecla-Day Mine Aspen Tailings Saddle Dam | 1987 | 365 | · | 166 | Significant | 0 |
| Tyson Fresh Meats Storage Pond 4 | 1993 | 755 | · | 107 | High | 0 |
| Sprague Wastewater Treatment Lagoons | 1993 | 107 | · | 1 | High | 10 |
| Weyerhaeuser Enumclaw Flood Control Dam | 1993 | 0 | · | 1,800 | High | 8 |
| Scabrock Feeders Dam 6a | 1970 | 156 | · | 1 | Low | 100 |
| Scabrock Feeders Dam 6c | 1970 | 114 | · | 1 | Low | 100 |
| Pend Oreille Mine Nw Tailings Dam | 2002 | 2,700 | · | 0 | Significant | 0 |
| Pend Oreille Mine Ne Tailings Dam | 2001 | 2,700 | · | 0 | Significant | 0 |
| Upper Snow Dam | 1939 | · | 10 | 370 | Low | 5 |
| Pumping Pond | 1960 | 234 | 22 | · | Low | · |
| Nestle Potato Effluent Lagoon | 1994 | 659 | · | 7 | Low | 0 |
| Newcastle Railroad Embankment Dam | 1900 | 15 | · | 1,530 | High | 0 |
| Garrison Creek 98th Avenue Detention D | 1996 | 4 | · | 216 | High | 1 |
| French Slough Agricultural Waste Storage | 1997 | 82 | · | 0 | Low | 0 |
| Little Falls Spillway Dam | 1910 | 4,250 | · | 70,000 | Low | 5,844 |
| George City Wastewater Treatment Lagoon | 1996 | 66 | 9 | 2 | Low | 0 |
| Deer Park Wastewater Storage Lagoon No | 1997 | 67 | · | 0 | High | 0 |
| Snoqualmie Ridge Golf Course Pond M1 | 1997 | 44 | · | 112 | Low | 0 |
| Mccain Foods Process Water Storage Facility | 1996 | 1,412 | 44 | 27 | High | 0 |
| Coulee City Wastewater Lagoon | 1997 | 111 | 6 | · | High | 0 |
| Pasco Process Water Reuse Storage Lagoon | 1997 | 352 | 18 | 18 | High | · |
| College Hill Reservoir | 1899 | 23 | · | 0 | High | 0 |
| Nada Dam | 1939 | · | 9 | 308 | Low | 2 |
| Wsr Dairy Waste Lagoon | 1998 | 61 | · | 0 | Low | 0 |
| Upper Sunlight Lake Dam | 1967 | 30 | · | 3 | High | 8 |
| Loon Lake Sewer Dist No 4 Waste Lagoon | 1998 | 73 | · | 5 | Low | 0 |
| Longeway Dam | 1970 | 60 | · | 100 | Low | 1 |
| Rockford Wastewater Pond No. 3 | 1999 | 41 | · | 0 | Significant | 0 |
| Seattle Port Lagoon No 3 Expansion | 2001 | 221 | · | 140 | High | 0 |
| Echo Falls Golf Course Reservoir No 2 | 2000 | 49 | · | 10 | Low | 0 |
| Cziglenski Beaver Pond Dam | 1995 | 321 | · | 0 | Low | 0 |
| Smith Brothers Dairy Storage Lagoon | 2001 | 91 | · | 12 | Low | 11 |
| Issaquah Highlands Reid Pond Dam | 2003 | 33 | · | 290 | High | 0 |
| Centralia Coal Mine Pond 46 Dam | 2004 | 8 | · | 300 | Significant | 0 |
| Horseshoe Lake Dam | 2003 | 280 | · | 2,680 | High | 4 |
| Icon Materials | 1997 | 50 | · | 125 | High | 0 |
| West Bank Project Reservoir | 2003 | 0 | · | 215 | High | 0 |
| 3 Amigos Reservoir | 2003 | 100 | · | 0 | High | 1 |
| Centralia Coal Mine Pond 46a Dam | 2004 | 48 | · | 621 | Significant | 1 |
| Issaquah Highlands South Pond Dam | 2003 | 22 | · | 110 | High | 0 |
| Camano Island Cattle Co Dam | 2004 | 100 | · | 525 | High | 0 |
| Sunnyside Mp 59.29 Reservoir | 2005 | 170 | · | 40 | High | 0 |
| Minckler Dam B | 1975 | 24 | · | 9 | High | 0 |
| Des Moines Ck Reg Det Pond West Berm | 2009 | 114 | · | 0 | High | 2 |
| Des Moines Ck Reg Det Facility East Berm | 2009 | 31 | · | 0 | High | 2 |
| Con Agra Foods New Storage Basin | 2006 | 130 | · | 15 | Low | 0 |
| Simplot Lrar Lagoon | 2006 | 61 | · | 0 | Low | 0 |
| Tapps Lake Backflow Prevention Structure | 2007 | 55,500 | · | 1,000 | High | 0 |
| Ludvick Lake Dam | 1950 | 60 | · | 17 | Low | 0 |
| Whistle Lake Dam | 1925 | 140 | · | · | High | 492 |
| Issaquah Highlands Detention Pond | 2008 | 44 | · | 0 | High | 0 |
| Walla Walla Effluent Storage Lagoon | 2008 | 78 | · | 0 | Significant | 0 |
| Sunnyside Mp 23.7 Reservoir | 2008 | 504 | · | 2,000 | High | 0 |
| Connell Wastewater Lagoon 4 | 2009 | 66 | · | 0 | Significant | 0 |
| Connell Wastewater Lagoon 5 | 2009 | 141 | · | 0 | Significant | 0 |
| Shillapoo Lake Dikes | 2007 | 1,115 | · | 150 | Low | 0 |
| Evans Flavorland Reservoir No 1 | 1985 | 102 | · | 250 | High | 1 |
| Evans Flavorland Reservoir No 2 | 1998 | 115 | · | 530 | High | 1 |
| Evans Tieton Pond Dam | 2004 | 27 | · | 70 | High | 0 |
| Ochoa Ob-3 Process Water Storage Lagoon | 2009 | 306 | · | 436 | High | 0 |
| Farmland Ranch 19 Dam | 1992 | 46 | · | 58 | High | 1 |
| Spokane Hutterian Brethren Dam | 2006 | 59 | · | 100 | High | 1 |
| Mallard Marsh Dam | 1960 | 168 | · | 22 | Low | 0 |
| Rec Silicon Wastewater Pond | 2009 | 177 | · | 25 | High | 0 |
| Helsell Dam | 1999 | 55 | · | 5 | Low | 0 |
| Sunnyside Mp 37.1 Reservoir | 2011 | 328 | · | 0 | High | 0 |
| Port Townsend Paper Asb Pond | 1978 | 550 | · | 0 | Significant | 0 |
| Tukwila South Project South Pond | 2011 | 100 | · | 119 | Low | 0 |
| Belfair Wwtp Treated Water Storage Pond | 2014 | 160 | · | 139 | High | 13 |
| Potters Pond Dam | 1959 | 42 | 11 | 153 | Low | 0 |
| Dawn Mines Evaporation Pond 6 | 2013 | 90 | · | 0 | High | 30 |
| North Aeration Stabilization Basin Lady Island | 1977 | 767 | · | · | Significant | 0 |
| N Marysville Regional Stormwater Pond No. 2 | 2015 | 14 | · | · | High | 0 |
| Hecla Groundwater Management Impoundment | 2015 | 129 | · | · | Significant | 0 |
| Ice Harbor Ranch Block 211 Reservoir | 2013 | 81 | · | · | Low | · |
| Sacheen Lake Wwtp Lagoons | 2016 | 38 | · | · | High | 0 |
| Roza Ww5 Reregulation Reservoir | 2017 | 1,600 | · | 125 | High | 15 |
| Upper Loop Reservoir | 2015 | 100 | · | 17 | High | · |
| Blackhorse East Dam | 1960 | 85 | 12 | 46 | Low | 0 |
| Long Lake East Dam | 1960 | 1,238 | 25 | 272 | Low | 4 |
| Lower Turnbull Dam | 1960 | 460 | 8 | 187 | Low | 4 |
| Upper Turnbull Dam | 1960 | 1,118 | 12 | 149 | Low | 1 |
| Columbia Marsh Unit #1 Pond No. 3 Dam | 1958 | 35 | 13 | 72 | Low | 3 |
| Upper Blackhorse Dam | 1960 | 20 | 10 | 728 | Low | 7 |
| Mayfield Plunge Pool Barrier | 1963 | 49 | 14 | 313,000 | Low | 1,392 |
| P.E.C. Headworks | 1990 | · | 90 | · | Significant | 3,600 |
| Yelm Canal Dike | 1930 | 350 | 35 | 750 | High | · |
| Grandview Wastewater Lagoon F Dam | 1997 | 112 | · | · | Significant | 1 |
| Grandview Wastewater Lagoon 1 Dam | 1999 | 55 | · | · | Significant | 0 |
| Ob-3 Warden Digester Lagoon | 2018 | 78 | · | · | High | 6 |
| Lamb Weston Richland Lrad Lagoon | 2017 | 89 | · | 6 | Significant | 0 |
| Cow Palace Lagoon 2 | 2017 | 75 | · | · | High | · |
| Quincy Brine Evaporation Ponds | 1989 | 199 | · | · | Significant | · |
| Two Rivers Sand And Gravel Extraction Pond | 1994 | · | · | · | Significant | 0 |
| Fish Barrier Dam | 1959 | 84 | 19 | 35,000 | Low | 215 |
| Spirit Lake Outlet Tunnel | 1985 | 13,000 | 184 | 570 | Undetermined | · |
| Coldwater Debris Dam | 1981 | 64,500 | 200 | · | Undetermined | · |
| Castle Lake Debris Dam | 1980 | 19,000 | 190 | · | Undetermined | 1 |
| Cadman Lewisville S&G Pit | 2007 | 266 | · | 11 | High | 14 |
| Stevenson Dam | 1969 | 19 | · | 98 | High | 1 |
| H & H Reservoir Dam No 1 | 1926 | 50 | · | 100 | High | 0 |
| Shiflett Reservoir No. 1 | 1945 | 15 | · | 0 | High | 0 |
| Shiflett Reservoir No. 2 | 1945 | 10 | · | 0 | High | 0 |
| Steffen Brothers Reservoir Dam | 1947 | 20 | · | 0 | High | 0 |
| Crisman Reservoir Dam | 1952 | 0 | 16 | 23 | Significant | 0 |
| Haight Reservoir Dam | 1951 | 12 | · | 21 | High | 0 |
| Binford Reservoir Dam | 1953 | 25 | · | 0 | Low | 0 |
| Elmer Dam | 1958 | 0 | · | 36 | High | 0 |
| Kyte Dam | 1966 | 17 | · | 154 | High | 0 |
| Elwick Dam | 1962 | 22 | · | 1,869 | High | 3 |
| Dawn Lake Dam | 1950 | 42 | · | 17 | High | 0 |
| Bullard Dam | 1969 | 19 | · | 390 | High | 1 |
| Smrekar Reservoir Dam | 1954 | 23 | · | 260 | Low | 1 |
| Sundstrom Dam No 1 | 1970 | 40 | · | 13 | Low | 0 |
| Sportsman Lake Dam | 1960 | 272 | · | 0 | Low | 0 |
| Summit Lake Dam | 1955 | 1,570 | · | 0 | Low | 0 |
| Lang Dam No 1 | 1956 | 14 | · | 0 | High | 0 |
| Sawyer Lake Outlet Structure | 1952 | 1,116 | · | 0 | Low | 0 |
| Wenatchee Heights Reservoir No 2 Dam | 1998 | 80 | · | 50 | High | 0 |
| Holiday Lake Dam | 1967 | 9 | · | 30 | High | 0 |
| Bremerton Reservoir No 4 | 1917 | 34 | · | 0 | High | 0 |
| Loon Lake Control Structure | 1951 | 5,590 | · | 0 | Low | 0 |
| Peabody Heights Reservoir | 1925 | 22 | · | 0 | High | 0 |
| Marysville Sewage Lagoon | 1959 | 144 | · | 0 | Low | 0 |
| Everett Reservoir No 2 | 1913 | 31 | · | 0 | Significant | 0 |
| Middle Pine Lake Dam | 1938 | 75 | 11 | 276 | Low | 34 |
| Cow Lake Dam | 1935 | 500 | · | 95 | Low | 315 |
| Kohne Dam No 2 | 1950 | 0 | · | 720 | Low | 0 |
| Stout Reservoir Dam | 1958 | 72 | · | 400 | High | 3 |
| Uddenberg Dam | 1968 | 80 | · | 0 | Low | 0 |
| Baker Lake Dam | 1966 | 20 | · | 0 | Low | 0 |
| Beryl Baker Dam | 1977 | 22 | · | 80 | High | 3 |
| Rio Mount Dam | 1979 | 25 | · | 80 | Low | 1 |
| Sisco Heights Dam | 1984 | 21 | · | 66 | High | 0 |
| Koura Dam | 1949 | 9 | · | 0 | High | 0 |
| Peterson Stormwater Detention Dam | 1988 | 60 | · | 140 | High | 1 |
| Happy Valley Stormwater Detention Basin | 1981 | 0 | · | 1,500 | High | 1 |
| Prosser Diversion | 1916 | 350 | 9 | · | Low | · |
| Boyd Lower Reservoir Dam | 1960 | 9 | · | 0 | High | 0 |
| Bellevue Detention Pond 179 North | 1977 | 14 | · | 480 | Low | 0 |
| Cedar Way Stormwater Detention Dam | 1985 | 25 | · | 860 | High | 2 |
| Mill Creek Canyon Stormwater Detention D | 1982 | 17 | · | 760 | High | 2 |
| Deer Park Sewage Treatment Lagoon | 1984 | 25 | · | 5 | High | 0 |
| Deer Park Waste Water Storage Lagoon | 1985 | 176 | · | 100 | High | 0 |
| Stemilt Equalizing Reservoir | 1985 | 35 | · | 19 | High | 0 |
| Selah Aerated Lagoon | 1985 | 18 | · | 0 | High | 0 |
| Klahanie Stormwater Detention Dam No 1 | 1984 | 8 | · | 50 | Significant | 1 |
| Badger Mountain Irr Dist Reservoir Expan | 1977 | 10 | · | 0 | High | 10 |
| Loon Lake Aeration Lagoon | 1986 | 15 | · | 18 | High | 0 |
| Haller Dam | 1945 | 12 | · | 4 | Low | 0 |
| Islewood Dam | 1971 | 24 | · | 0 | High | 0 |
| Williams Dam | 1982 | 30 | · | 0 | Low | 0 |
| Nielsen Dam B | 1973 | 10 | · | 27 | High | 0 |
| Nielsen Dam C | 1973 | 12 | · | 4 | High | 0 |
| Fairfield Sewage Equalization Basin - Lagoon 2 | 1966 | 13 | · | 0 | Significant | 0 |
| May Lake Dam | 1950 | 11 | · | 10 | High | 1 |
| St Clair Stormwater Detention Dam | 1986 | 21 | · | 1,335 | High | 1 |
| Jays Pond Dam | 1973 | 13 | · | 8 | High | 0 |
| Quincy Aerated Lagoon No 1 | 1987 | 6 | · | 0 | Significant | 0 |
| Quincy Aerated Lagoon No 2 | 1987 | 6 | · | 0 | Significant | 0 |
| Davenport Sewage Lagoon No 2 | 1987 | 37 | · | 0 | High | 0 |
| Davenport Sewage Lagoon No 3 | 1987 | 33 | · | 0 | High | 0 |
| Diamond Lake Sewage Lagoon No 1 | 1988 | 0 | · | 20 | High | 0 |
| Queens Bog Dam | 1987 | 34 | · | 80 | Low | 5 |
| Blazing Tree Ranch Pond 6 Dam | 1977 | 23 | · | 100 | Low | 0 |
| Green Mountain Pond | 1987 | 40 | · | 80 | Low | 0 |
| Jefferts Dam | 1988 | 32 | · | 100 | Low | 0 |
| I405 Coal Creek Stormwater Detention Da | 1987 | 1 | · | 1,000 | Low | 0 |
| Des Moines Creek Stormwater Detention Da | 1989 | 16 | · | 100 | High | 1 |
| Lakemont Stormwater Pond | 1992 | 10 | · | 581 | High | 0 |
| Roslyn Wastewater Lagoon No 3 | 1973 | 50 | · | 1 | Low | 10 |
| Telegraph Road Stormwater Detention Dam | 1988 | 0 | · | 800 | High | 1 |
| Seaway Center Stormwater Detention Dam | 1989 | 16 | · | 90 | Significant | 0 |
| Springwood Stormwater Detention Dam | 1992 | 35 | · | 211 | High | 1 |
| Boeing Auburn Drainage Ditch Detention D | 1994 | 30 | · | 119 | Low | 1 |
| Pigeon Creek No 1 Stormwater Detention D | 1990 | 18 | · | 322 | Significant | 0 |
| Roy Farms Irrigation Pond | 1989 | 7 | · | 0 | High | 0 |
| Wood Reservoir Dam No 2 | 1989 | 27 | · | 100 | High | 0 |
| Horton Road Detention Dam | 1994 | 0 | · | 486 | High | 1 |
| Vaagen Mitigation Control Structure | 1990 | 50 | · | 65 | Low | 0 |
| Edaleen Dairy Waste Storage Pond No. 2 | 1989 | 19 | · | · | High | 0 |
| Geneva Lake Dam | 1988 | 10 | · | · | High | 0 |
| Winlock Waterski Pond Dam | 1990 | 50 | · | 0 | Low | 2 |
| Wade Dann Waterski Pond Dam | 1990 | 50 | · | 0 | Low | 0 |
| Macs Pond Dam | 1895 | 12 | · | 65 | Low | 0 |
| Chinook Water District Dam | 1991 | 27 | · | 150 | Low | 1 |
| Tree Top Selah Wastewater Lagoon | 1991 | 168 | · | 9 | Low | 0 |
| Windsor Waterski Pond | 1992 | 100 | · | 78 | High | 0 |
| Lunds Gulch Creek Regional Stormwater Detention Pond | 1992 | 12 | · | 383 | High | 1 |
| Mill Pond Stormwater Detention Dam | 1994 | 0 | · | 383 | High | 1 |
| Havvaski Waterski Pond | 1992 | 83 | · | 15 | Low | 0 |
| Bagley | 1927 | 0 | · | 40 | High | 1 |
| Woodcrest Lakes Dam | 1980 | 25 | · | 6 | Low | 0 |
| Davenport Sewage Lagoon No 1 | 1993 | 39 | · | 3 | High | 0 |
| Fairview Reservoir No 2 | 1921 | 46 | · | 8 | High | 0 |
| Mill Creek Dam Cosmopolis | 2019 | 10 | · | 0 | High | 2 |
| Bremerton National Airport Detention Dam | 1995 | 0 | · | 277 | Low | 1 |
| Panther Lake Detention Dam | 1994 | 0 | · | 650 | High | 2 |
| West Richland Sewage Lagoon North | 1961 | 35 | · | 0 | Significant | 2 |
| Flying Goose Ranch Wetland Dam No 1 | 1995 | 60 | · | 140 | Low | 4 |
| Panther Lake Ballfield Dam | 1994 | 0 | · | 637 | High | 2 |
| Quadrant Lake No 1 | 1994 | 57 | · | 480 | Low | 1 |
| Slavic Lake Dam | 1990 | 8 | · | 30 | High | 2 |
| Snohomish Wastewater Treatment Lagoon Sy | 1995 | 46 | · | 29 | Low | 0 |
| Panther Lk First Avenue Bas Detent Pond | 2000 | 1 | · | 52 | High | 0 |
| Springdale Wastewater Pond System | 1995 | 62 | 11 | 2 | Low | 9 |
| South 336th Street Stormwater Dam No 1 | 1996 | 35 | 12 | 430 | High | 1 |
| Flat Top Ranch Frost Control Pond | 1996 | 43 | · | 22 | High | 0 |
| Horn School Rest Area Sewage Lagoon | 1996 | 19 | · | 10 | High | 0 |
| South 336th Street Stormwater Dam No 2 | 1996 | 4 | · | 430 | High | 1 |
| Kennewick Sewage Lagoon System | 1997 | 246 | 24 | 50 | High | 0 |
| Iman Lake Dam | 1996 | 22 | · | 177 | High | 1 |
| North Fork Clover Creek E1 Det Basin | 2000 | 40 | · | 749 | High | 2 |
| Olympic View Landfill Leachate Lagoon No | 1997 | 10 | · | 3 | High | 0 |
| Great Depression Dam | 1998 | 30 | · | 202 | High | 0 |
| Boeing Creek Park North Pond Dam | 1998 | 1 | · | 227 | High | 1 |
| Waitt Lk Valley Sewage Treatment Lagoon | 1998 | 78 | · | 0 | Low | 0 |
| Pacific Nw Sugar Co Sedimentation Pond | 1998 | 99 | · | 0 | Low | 0 |
| Pacific Nw Sugar Co Condensation Pond | 1998 | 100 | · | 0 | Low | 0 |
| Trossachs Detention Pond Pc-3 | 1999 | 18 | · | 57 | High | 0 |
| Milles Lake Dam | 1950 | 20 | · | 172 | High | 1 |
| Beacon Hill Reservoir | 1935 | 11 | · | 0 | High | 0 |
| West Fork Dam | 1956 | 7 | · | 0 | Significant | 8 |
| Silver Firs Detention Pond No 3 | 1999 | 1 | · | 324 | High | 1 |
| Kennewick No 1 Aerated Wastewater Lagoon | 1975 | 114 | · | 0 | High | 0 |
| Kennewick No 2 Aerated Wastewater Lagoon | 1975 | 132 | · | 0 | High | 0 |
| Redmond Ridge Cedar Dam | 1999 | 32 | · | 53 | High | 0 |
| Snoqualmie Ridge Osprey Ct Pond D1 | 1999 | 1 | · | 44 | High | 7 |
| Hovander Dairy Waste Storage Pond | 1998 | 5 | · | 0 | Significant | 0 |
| Port Of Moses Lake Lagoon | 1999 | 25 | · | 0 | Low | 0 |
| Bueler Dairy Waste Storage Pond | 2000 | 23 | · | 0 | Significant | 0 |
| Ritzville Wastewater Lagoons | 2000 | 303 | · | 4 | Significant | 0 |
| Quadrant East Campus Parcel 1 Dam | 2000 | 1 | 10 | · | Significant | 38 |
| Aldarra Pond Dfr1 | 2001 | 1 | · | 0 | Low | 0 |
| 204th Street Stormwater Detention Basin | 2001 | 12 | · | 450 | Significant | 1 |
| South Ridge Stormwater Detention Dam | 2002 | 22 | · | 63 | High | 0 |
| Connell Wastewater Lagoons | 2000 | 60 | · | 0 | Significant | 0 |
| Metaline Falls Wastewater Lagoon No 3 | 1963 | 10 | · | 1 | Significant | 0 |
| North Ranch Storage Lagoon | 2018 | 20 | · | 0 | Significant | 0 |
| Ingredion Process Water Lagoon | 2000 | 43 | · | 3 | Significant | 0 |
| North Bay Water Reclamation Pond 1 | 2000 | 45 | · | 51 | Significant | 0 |
| North Fork Clover Creek W1 Det Facil | 2001 | 85 | · | 1,260 | High | 3 |
| Trossachs Detention Pond Pc-2 | 2002 | 43 | · | 85 | High | 0 |
| Csr Associated Avenue Retention Dam | 2003 | 15 | · | 0 | Low | 0 |
| Redmond Ridge Drive Ec 4n Roadway Dam | 2003 | 1 | · | 62 | High | 0 |
| Orchards Block 96 Reservoir Dam | 2001 | 50 | · | 360 | High | 0 |
| Talus P5 Stormwater Detention Dam | 2002 | 1 | · | 0 | High | 0 |
| Lakeland South Pond No 1 | 2003 | 18 | · | 70 | High | 0 |
| Fairfield Sewage Aerated Lagoon - Lagoon 1 | 2003 | 10 | · | 0 | Significant | 0 |
| West Lynden Regional Detention Facility | 2003 | 26 | · | 46 | Low | 0 |
| Issaquah Highlands Np2 Pond Dam | 2002 | 19 | · | 9 | High | 0 |
| Mountain Pond Dam | 1992 | 22 | · | 50 | High | 0 |
| Orchards Block 92 Dam | 1992 | 45 | · | 24 | Low | 0 |
| Madsen Creek West Basin Dam | 2008 | 16 | · | 50 | High | 0 |
| Coleman Dam | 1982 | 25 | 22 | · | High | · |
| Issaquah Highlands Npe Pond | 2003 | 11 | · | 50 | High | 0 |
| High Point Redevelopment Stormwater Dam | 2006 | 3 | · | 182 | High | 0 |
| Sunny Dene Dairy Waste Pond | 2004 | 23 | · | 82 | Significant | 35 |
| Valley View Dairy Waste Pond | 2003 | · | · | · | Significant | · |
| Gap Road Reservoir | 2004 | 37 | · | 10 | High | 0 |
| N Marysville Regional Stormwater Pond | 2004 | 10 | · | 94 | High | 0 |
| Colville Wastewater Lagoons | 1967 | 175 | · | 0 | Low | 0 |
| Reardan Sewage Lagoon | 2006 | 16 | · | 0 | High | 0 |
| Williams Lake Sewer Dist 2 Lagoons | 2007 | 39 | · | 0 | Low | 0 |
| Muth Stormwater Pond | 2007 | 30 | · | 68 | High | 0 |
| Minckler Dam A | 1975 | 11 | · | 5 | High | 0 |
| Spscc Stormwater Pond F | 2005 | 10 | · | 20 | High | 0 |
| Mccormick North Phase I East Pond | 2009 | 8 | · | 123 | High | 0 |
| Redmond Ridge East Pond Srn 2 No 1 | 2008 | 22 | · | 400 | High | 0 |
| Section 34 Re Regulating Reservoir | 2005 | 40 | · | 30 | Low | 0 |
| Chehalis Regional Water Reclamation Pond | 2005 | 8 | · | 0 | Significant | 0 |
| Cedar Heights Dam | 2007 | 13 | · | 74 | High | 0 |
| Seatac Airport Se Pond | 2007 | 11 | · | 0 | Significant | 0 |
| Watts Bros Organic Dairy Lagoon 1 | 2007 | 33 | · | 0 | Significant | 0 |
| Watts Bros Organic Dairy Lagoon 2 | 2007 | 26 | · | 0 | Significant | 0 |
| Watts Bros Organic Dairy Lagoon 3 | 2007 | 28 | · | 0 | Significant | 0 |
| Kinross Gold Kettle River Reclaim Pond | 2008 | 13 | · | 0 | Significant | 0 |
| Newcastle Vista Pond 3 | 2012 | 3 | · | 870 | High | 0 |
| Connell Wastewater Lagoon 1a | 2009 | 13 | · | 0 | Significant | 0 |
| Edaleen Dairy Waste Storage Pond No 3 | 2007 | 31 | · | 0 | High | 0 |
| Roche Pomona Dam | 1995 | 30 | · | 0 | High | 0 |
| Evans Far West Pond Dam | 1997 | 22 | · | 750 | High | 1 |
| Mccormick Woods Pond Rc-8 | 2017 | 4 | · | 0 | High | 0 |
| Redmond Ridge East Srs 1 Pond No 1 | 2013 | 26 | · | 284 | High | 0 |
| Tyson Fresh Meats Lagoons 1 2 3 | 1980 | 37 | · | 0 | Significant | 0 |
| Bear Mountain Dam | 2003 | 12 | 12 | · | High | 0 |
| Columbia River Orchard Reservoir 2 | 2008 | 38 | · | 11 | High | 0 |
| Evans Konnowac Dam | 1990 | 21 | · | 50 | High | 0 |
| Avalon Fruit Dam 1 | 1985 | 25 | · | 5 | High | 0 |
| Avalon Fruit Dam 2 | 1985 | 17 | · | 5 | High | 0 |
| Avalon Fruit Dam 3 | 1985 | 15 | · | 0 | High | 0 |
| Avalon Fruit Dam 4 | 1985 | 16 | · | 0 | High | 0 |
| Avalon Fruit Dam 5 | 1985 | 10 | · | 0 | High | 0 |
| Lawrence Orchards Dam | 1995 | 27 | · | 6 | High | 0 |
| Cardinal Crest Reservoir Dam | 1990 | 14 | · | 0 | High | 0 |
| Gamache Dam | 1987 | 23 | · | 15 | High | 3 |
| Den Hoed Dam No 1 | 1999 | 19 | · | 58 | High | 18 |
| Del Monte Foods Inc | 1968 | 18 | · | · | High | 0 |
| Stanwood Wastewater Pond | 1980 | 60 | · | 0 | Low | 0 |
| Holmes Harbor Reclaimed Water Ponds | 1994 | 38 | · | 0 | High | 0 |
| Selah Home Ranch Reservoir | 2009 | 27 | · | 684 | High | 0 |
| Thode Dam | 1987 | 14 | · | 4 | High | 0 |
| Albion Sewage Treatment Lagoons | 1972 | 30 | · | 0 | Low | 0 |
| Selah Naches Ranch Reservoir | 2004 | 23 | · | 780 | High | 0 |
| Tesoro Water Storage Reservoir | 1958 | 37 | · | 163 | High | 0 |
| Shell Refinery Water Storage Reservoir | 1958 | 25 | · | 0 | Low | 0 |
| Koehn Ranch Reservoir | 2009 | 17 | · | 0 | High | 0 |
| Seatac Airport Pond G | 2009 | 0 | · | 298 | High | 0 |
| Chiawana Richland Ranch Dam | 1998 | 31 | · | 17 | High | 0 |
| Chiawana Frenchman Hills Dam | 1995 | 29 | · | 0 | High | 0 |
| Chiawana Gleed Ranch Dam | 2003 | 13 | · | 10 | High | 0 |
| Curtis Dam | 1978 | 20 | · | 32 | High | 1 |
| Engelsma Dairy Lagoon Dam | 1994 | 15 | · | 0 | Significant | 0 |
| D&A Dairy Consolidated Lagoon No. 1 | 2021 | · | · | · | Significant | · |
| Dionysus Dam | 1973 | 28 | · | 0 | High | 0 |
| Bacchus Dam | 1973 | 63 | · | 0 | Low | 0 |
| Samish Wd Sewage Lagoon No. 1 | 1974 | 5 | · | 0 | Significant | 0 |
| Samish Wd Sewage Lagoons | 1974 | 9 | · | 0 | Significant | 0 |
| Paterson Ranch Reservoir | 2010 | 41 | · | 5 | High | 0 |
| Evans Desert Aire Pond | 1990 | 21 | · | 10 | High | 0 |
| Johnson Pond Dam | 2011 | 20 | · | 10 | High | 0 |
| Van Wingerden Pond 1 | 1980 | · | · | · | Low | · |
| Interfor Pacific Stormwater Pond | 2001 | 27 | · | 440 | High | 0 |
| Partridge Ranch Dam | 2010 | 19 | · | 12 | High | 0 |
| Bonney Lake Wsu Infiltration Pond | 2018 | 30 | · | 0 | High | 0 |
| Svid Mabton Canal 12.48 Reservoir | 2010 | 15 | · | 0 | High | 0 |
| Camping Dairy Lagoon Dam | 1980 | 11 | · | 0 | High | 0 |
| Lohrer Dam | 1974 | 19 | · | 26 | High | 325 |
| Bosma Dam No. 1 | 2000 | 16 | · | 0 | Significant | 0 |
| H&S Bosma Consolidated Lagoon No 4 | 2000 | 12 | · | 0 | Significant | 0 |
| Liberty Acres Lagoon 14 | 1990 | 10 | · | 0 | Significant | 0 |
| Boman Reservoir Dam | 1977 | 52 | · | · | High | 0 |
| Cow Palace Lagoon 1 | 2000 | 30 | · | 7 | Significant | 0 |
| Schweitzer Dam And Reservoir | 1914 | 69 | · | · | High | 5 |
| Tyson Fresh Meats Pasco Brine Pond 8 | 2010 | 27 | · | 1 | Significant | 0 |
| Van Stone Pit Lake Dam | 1999 | 439 | · | 86 | High | 0 |
| Cusick Polishing Lagoon | 1978 | 0 | · | 0 | Significant | 0 |
| Seatac Airport Pond M | 2011 | 1 | · | 435 | High | 0 |
| Bellingham Airport Sw Detention Pond 3 | 2011 | · | · | · | High | · |
| Ste Michelle Canoe Ridge Evaporation Pond | 2012 | 18 | · | · | Significant | 0 |
| Rosalia Sewage Lagoon | 1989 | 28 | · | · | High | 0 |
| Prosser Warehouse Treatment Lagoon | 2012 | 14 | · | · | Significant | · |
| Finley Ranch Reservoir | 2013 | 34 | · | · | High | 0 |
| Fresh Water Pond | · | · | 30 | · | Significant | · |
| Friesland Dairy Lagoons | 2013 | · | · | · | High | 0 |
| Headquarters Landfill Leachate Pond | 1993 | 22 | · | 2 | Significant | 0 |
| Port Of Sunnyside Anaerobic Pretreatment System | 2015 | 31 | · | · | High | 0 |
| Eaglemont Storm Pond | 2014 | 10 | · | 290 | High | 0 |
| Burnt Ridge Surface Impoundment | 1998 | 9 | · | · | Significant | 0 |
| Baby Gap Ranch Reservoir | 2015 | 13 | · | · | High | · |
| Lincoln Rock S.P. Evaporative Lagoons | 1981 | 13 | · | 15 | Significant | 3 |
| Cedar Hills Landfill Csw Pond | 2016 | 46 | · | 214 | Significant | 0 |
| Conner Jarvis East Pond | 2018 | 8 | · | · | Significant | 0 |
| Quincy Sludge Storage Lagoon System Lagoons 1 2 And 3 | 1986 | · | · | · | Significant | 0 |
| Tyson Fresh Meats Brine Pond 7 | 1995 | 20 | · | · | Significant | · |
| Latitude 47 Commerce Center Stormwater Pond | 2020 | 10 | · | · | High | · |
| Columbia Marsh Unit #2 Dam | 1957 | 117 | 15 | 2,884 | Low | 7 |
Reservoir FAQ
About Washington dams & reservoirs
Where does the Washington dam data come from?
The U.S. Army Corps of Engineers National Inventory of Dams (NID) plus state water-resource agencies. Snoflo joins these public records with live USGS streamgauge readings downstream where available. The NID is the canonical federal dam registry.
What does Hazard Potential mean?
USACE classifies every dam by what would happen if it failed: Low (no loss of life expected, minimal economic damage), Significant (no loss of life but economic, environmental, or lifeline damage), High (loss of life expected). It's a downstream-consequence rating, not a likelihood of failure.
What is Normal Storage in acre-feet?
The volume of water the reservoir holds at its normal operating level, measured in acre-feet. One acre-foot is about 325,851 gallons or 1,233 cubic meters — the amount needed to cover one acre to a depth of one foot.
Why are some Washington dams missing storage or height data?
USACE NID records can have gaps for small or older dams that pre-date federal reporting requirements. Snoflo surfaces whatever the canonical record contains. If a dam you care about has incomplete data, contact the operating agency or USACE for updates.
Can I see live water levels?
Yes — tap any dam name to open its detail page, which pulls live storage data from USGS streamgauges or operating-agency feeds where available. Historical levels and seasonal averages are also shown.
Why does Washington have so many dams?
The U.S. has over 90,000 dams — most built between 1930 and 1980 during the federal water-development era. Washington's count reflects a combination of agricultural irrigation needs, flood control, hydropower, and recreation. The "Built by decade" chart above shows the timeline.
Browse other states
Reservoirs & dams in every state
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
District Of Columbia
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Puerto Rico
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virgin Islands
Virginia
Washington
West Virginia
Wisconsin
Wyoming