Bridge conditions in King County, Washington 1,252 inventoried bridges · 50 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions 2025 National Bridge Inventory, FHWA Compiled August 20, 2026
50 of the 1,252 bridges the federal inventory lists in King County are rated poor; the rest split 595 good and 607 fair.
50 of the 1,252 bridges in King County, Washington, are rated in poor condition (4.0%) in the 2025 National Bridge Inventory, as of August 20, 2026 .595 bridges (47.5%) are rated good and 607 (48.5%) fair.
The median King County bridge was built in 1972 .
The busiest poor-rated bridge is I-5 over Lucile St (built 1966), carrying about 96,847 vehicles a day.
Good 47.5% · Fair 48.5% · Poor 4.0% of 1,252 bridges
Bridges rated poor Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
Bridge Built Vehicles/day Condition I-5 over Lucile St 1966 96,847 Poor I-90 over Mercer Sl 1970 74,410 Poor I-90 over Mercer Slough 1940 74,410 Poor I-90 over Lake Washington 1940 68,544 Poor W.B. & Rev I-90 over Lake Washington 1989 68,544 Poor S Boeing Access Rd over Airport Way Bar Ramp 1952 40,000 Poor Eastlake Ave NE over Portage Bay Pl E 1930 36,000 Poor Eastlake Ave NE over Portage Bay 1915 35,000 Poor I-90 over Game Crossing 1976 33,803 Poor 15TH St Northwest over UPRR 1972 31,879 Poor I-90 over Raging River 1975 31,252 Poor 4TH Ave S over Argo RR Yard 1933 28,000 Poor 4TH Ave S over Parking Garage 1910 27,000 Poor W Meeker Street over Green River 1958 25,000 Poor I-90 EB over Humpback Creek 1972 18,894 Poor I-90 over S Fk Snoqualmie R 1974 18,876 Poor I-90 over Bandera Rd 1972 18,753 Poor I-90 over Bandera Rd 1972 18,753 Poor W Garfield St over Marina Pl RR Ravine 1929 18,000 Poor I-90 over SR 906 W-w Ramp 1969 17,601 Poor I-90 WB over So Fk Snoqulmie R 1971 17,601 Poor Klickitat Dr over I-5 1964 15,000 Poor 2 Ave Exten S over Railroad 1928 13,700 Poor SR 203 over Cherry Creek 1946 10,445 Poor SR 202 over Snoqualmie River 1931 9,740 Poor 102ND Ave over State Route 522 1950 9,464 Poor SR 203 over Slough 1945 7,813 Poor SR 203 over Slough 1945 7,813 Poor NE 128TH St over NB I-405 2006 7,766 Poor Kent-blk Diamond over BNSF RR 1931 7,700 Poor S 129TH St over I-5 1966 6,386 Poor US 2 over Anthracite Creek 1940 5,782 Poor SE May Valley Rd over Fifteen Mile Creek 1932 4,279 Poor 148TH Ave SE over May Creek 1951 3,900 Poor 42ND Ave So over Duwamish River 1949 3,185 Poor Meadowbrook Way SE over Snoqualmie River 1921 2,458 Poor 428TH Ave SE over N Fk Snoqualmie R 1951 1,200 Poor Overlake Dr over Depression 1951 1,050 Poor Stossel Ck Rd over Cherry Creek 1947 1,010 Poor SE Mud Mt Rd over Boise Creek 1956 947 Poor I-90 over S Fk Snoqualmie R 1974 356 Poor 252 Ave SE Issaq over Issaquah Creek 1951 330 Poor NE 175TH St over Swamp Creek 1951 300 Poor 284TH Ave NE over Sikes Lake 1978 225 Poor Homestead Vlly Rd over S Fk Snoqualmie River 1974 200 Poor Fury Lake Rd. over Deep Creek 1965 110 Poor S 102nd St over Duwamish River 1957 100 Poor NE Index Ck Rd over Skykomish River-s Fork 1930 80 Poor Newhalem Ph Road over Newhalem Creek 1968 65 Poor Road over Snow Creek 1979 27 Poor
Busiest bridges in the county Bridge Built Vehicles/day Condition I-90 EB over Sunset Creek 2024 139,482 Good I-90 WB over Sunset Creek 2024 139,482 Good N Queen Anne Dr over Ravine 1935 125,000 Fair I-5 over Terrain 1966 122,487 Fair SW Spokane St over Duwamish River W Waterwy 1983 108,179 Fair I-5 over Terrain 1966 106,282 Fair I-5 over Klickitat Dr 1965 106,282 Fair I-5 over I-405 NB / SR 518 EB 1966 106,282 Good I-5 over I-405 NB / SR 518 EB 1966 106,282 Fair I-5 over E-n Ramp 1965 106,282 Good
Source: FHWA National Bridge Inventory , 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Washington: Washington bridge conditions by county · every download on the data page .
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected .