Dams in King County, Washington

92Total Dams

62High Hazard

9Significant

Dam Safety in King County, Washington

King County has 92 dams tracked in the National Inventory of Dams. Of these, 62 are classified as high hazard — meaning failure would probably cause loss of human life. Another 9 carry a significant hazard classification. Currently, 1 dams have a condition assessment of poor or unsatisfactory.

The average dam in King County is 45 years old. The most common purpose is flood risk reduction. The tallest dam is Mud Mountain Dam at 425 ft.

Explore more: Oldest dams in Washington · Tallest dams · High risk dams · Largest reservoirs

Dam	Hazard	Condition	Height (ft)	Purpose	Year
Mud Mountain Dam	High	Not Available	425	Flood Risk Reduction	1948
Howard A. Hanson Dam	High	Not Available	235	Flood Risk Reduction	1962
Masonry Dam	High	Satisfactory	230	Hydroelectric	1914
Tolt River - South Fork	High	Fair	200	Water Supply	1962
Icon Materials Pond 4	High	Fair	140	Water Supply	1997
Hiram M. Chittenden Locks And Dam	High	Not Available	63	Navigation	1916
Newcastle Railroad Embankment Dam	High	Poor	55	Flood Risk Reduction	1900
Boeing Creek Park North Pond Dam	High	Satisfactory	54	Flood Risk Reduction	1998
Tuck Lake Dam	High	Fair	47	Recreation	1966
Margaret Lake Dam	High	Fair	41	Recreation	1933
Boeing Creek M1 Detention Dam	High	Satisfactory	40	Flood Risk Reduction	1983
Issaquah Highlands Reid Pond Dam	High	Fair	38	Flood Risk Reduction	2003
Seattle City Volunteer Park Reservoir	High	Satisfactory	35	Water Supply	1901
Regulating Basin South Dam	High	Satisfactory	35	Water Supply	1962
Radar Lake Dam	High	Satisfactory	34	Recreation	1973
Seattle Port Lagoon No 3	High	Satisfactory	32	Flood Risk Reduction	2001
Marcel Lake Dam	High	Fair	31	Recreation	1964
Weyerhaeuser Enumclaw Flood Control Dam	High	Fair	30	Flood Risk Reduction	1993
Garrison Creek 98th Avenue Detention D	High	Fair	30	Flood Risk Reduction	1996
Lake Forest Park Reservoir	High	Satisfactory	30	Water Supply	1962
Issaquah Highlands Np2 Pond Dam	High	Fair	28	Flood Risk Reduction	2002
Bitter Lake Reservoir	High	Satisfactory	27	Water Supply	1958
Southwest Genesee Street Detention Dam	High	Fair	27	Flood Risk Reduction	1974
Issaquah Highlands South Pond Dam	High	Fair	27	Flood Risk Reduction	2003
Redmond Ridge Cedar Dam	High	Fair	26	Flood Risk Reduction	2000
Welcome Lake Dam	High	Fair	24	Recreation	1959
Issaquah Highlands Npe Pond	High	Fair	24	Flood Risk Reduction	2003
Talus P5 Stormwater Detention Dam	High	Satisfactory	24	Flood Risk Reduction	2002
Roosevelt Reservoir	High	Satisfactory	23	Water Supply	1910
Mill Creek Canyon Stormwater Detention D	High	Satisfactory	22	Flood Risk Reduction	1982
Issaquah Highlands Falls Pond Dam	High	Satisfactory	22	Flood Risk Reduction	2008
Upper Mill Creek Stormwater Detention Da	High	Satisfactory	21	Flood Risk Reduction	1990
Trossachs Detention Pond Pc-2	High	Satisfactory	21	Flood Risk Reduction	2002
Youngs Lake New Inlet Dam	High	Satisfactory	20	Water Supply	1926
South 336th Street Stormwater Dam No 2	High	Fair	19	Flood Risk Reduction	1996
Des Moines Ck Reg Det Facility East Berm	High	Satisfactory	18	Flood Risk Reduction	2009
Johnson Pond Dam	High	Fair	18	Flood Risk Reduction	2011
Des Moines Creek Stormwater Detention Da	High	Satisfactory	18	Flood Risk Reduction	1989
Snoqualmie Ridge Osprey Ct Pond D1	High	Satisfactory	16	Flood Risk Reduction	1999
Trossachs Detention Pond Pc-3	High	Satisfactory	15	Flood Risk Reduction	1999
Panther Lake Ballfield Dam	High	Fair	15	Flood Risk Reduction	1994
Peterson Stormwater Detention Dam	High	Satisfactory	15	Flood Risk Reduction	1988
Redmond Ridge East Pond Srn 2 No 1	High	Fair	14	Flood Risk Reduction	2008
Mill Pond Stormwater Detention Dam	High	Satisfactory	13	Flood Risk Reduction	1994
Madsen Creek West Basin Dam	High	Satisfactory	13	Flood Risk Reduction	2008
Lakemont Stormwater Pond	High	Satisfactory	13	Flood Risk Reduction	1992
Muth Stormwater Pond	High	Satisfactory	12	Flood Risk Reduction	2007
Panther Lake Detention Dam	High	Fair	12	Flood Risk Reduction	1994
South 336th Street Stormwater Dam No 1	High	Fair	12	Flood Risk Reduction	1996
Newcastle Vista Pond 3	High	Fair	11	Flood Risk Reduction	2012
Seatac Airport Pond G	High	Satisfactory	11	Flood Risk Reduction	2009
Redmond Ridge East Srs 1 Pond No 1	High	Satisfactory	11	Flood Risk Reduction	2013
Seatac Airport Pond M	High	Satisfactory	10	Flood Risk Reduction	2011
Youngs Lake Outlet Dam	High	Satisfactory	10	Water Supply	1921
Klahanie Stormwater Detention Dam No 13	High	Fair	10	Flood Risk Reduction	1989
Lake Kittyprince Dam	High	Fair	10	Irrigation	1967
Springwood Stormwater Detention Dam	High	Fair	10	Flood Risk Reduction	1992
South Ridge Stormwater Detention Dam	High	Fair	10	Flood Risk Reduction	2002
Yellow Lake Outlet Dike	High	Satisfactory	10	Flood Risk Reduction	1986
Panther Lk First Avenue Bas Detent Pond	High	Satisfactory	9	Flood Risk Reduction	2000
Des Moines Ck Reg Det Pond West Berm	High	Satisfactory	8	Flood Risk Reduction	2009
Redmond Ridge Drive Ec 4n Roadway Dam	High	Satisfactory	8	Flood Risk Reduction	2003
Garrison Creek Stormwater Detention Dam	Significant	Satisfactory	55	Flood Risk Reduction	1991
Youngs Lake Cascades Dam	Significant	Satisfactory	16	Water Supply	1950
Miller Creek Regional Detention Facility	Significant	Satisfactory	16	Flood Risk Reduction	1992
Cedar Hills Landfill Csw Pond	Significant	Fair	14	Other	2016
Conner Jarvis East Pond	Significant	Satisfactory	11	Flood Risk Reduction	2018
Quadrant East Campus Parcel 1	Significant	Satisfactory	11	Flood Risk Reduction	2000
204th Street Stormwater Detention Basin	Significant	Fair	9	Flood Risk Reduction	2001
Seatac Airport Se Pond	Significant	Satisfactory	9	Flood Risk Reduction	2007
Klahanie Stormwater Detention Dam No 1	Significant	Fair	9	Flood Risk Reduction	1984
I405 Coal Creek Stormwater Detention Da	Low		31	Flood Risk Reduction	1987
Morse Lake Overflow Dike	Low		30	Water Supply	1904
High Woodlands Stormwater Detention Dam	Low		27	Flood Risk Reduction	1991
Bellevue Detention Pond 179 North	Low		26	Flood Risk Reduction	1977
Loutsis Dam	Low	Satisfactory	22	Irrigation	1970
Tukwila South Project South Pond	Low	Satisfactory	21	Flood Risk Reduction	2011
Snoqualmie Falls	Low	Satisfactory	19	Hydroelectric	1898
Loreene Lake Dam	Low		19	Recreation	1963
Ravensdale Pit	Low		18	Other	1972
Snoqualmie Ridge Golf Course Pond M1	Low		18	Irrigation	1997
Bellevue Detention Pond 165	Low		16	Flood Risk Reduction	1983
Weyerhaeuser Dam	Low		15	Recreation	1970
Aldarra Pond Dfr1	Low		15	Flood Risk Reduction	2001
Jean Lake Dam	Low		15	Recreation	1963
Queens Bog Dam	Low		12	Flood Risk Reduction	1987
Bellevue Detention Pond 133	Low		12	Flood Risk Reduction	1983
Bellevue Detention Pond 197	Low		12	Flood Risk Reduction	1983
Snoqualmie Mill Pond Dam	Low		10	Fish and Wildlife Pond	1917
Sawyer Lake Outlet Structure	Low		10	Recreation	1952
Quadrant Lake No 1	Low		8	Flood Risk Reduction	1994
Boeing Auburn Drainage Ditch Detention D	Low		7	Flood Risk Reduction	1994

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