King County, WA

1,364 public highway bridges

King County Bridge Snapshot

King County, Washington contains 1,364 public highway bridges in the FHWA National Bridge Inventory. Roughly 31% are rated “Good,” 33.4% “Fair,” 3.3% “Poor,” and 3.3% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in WA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

1,364

Total Bridges

31%

Good

3.3%

Poor

3.3%

Structurally Deficient

Condition Distribution

Good

31% (423)

Fair

33.4% (456)

Poor

3.3% (45)

SD

3.3% (45)

All Bridges (1,364)

Sort:

I-90

Over: S FK SNOQUALMIE R

17.3 E JCT SR 202, King, WA

Built 1971 Load: 39.0 t ADT: 17,937

I-90

Over: EAST CHANNEL-LK WASH

5.9 E JCT I-5, King, WA

Built 1988 Load: 39.0 t ADT: 61,610

SR 520

Over: NE 24TH ST

1.9 E JCT I-405, King, WA

Built 1998 Load: 39.0 t ADT: 43,146

N QUEEN ANNE DR

Over: RAVINE

Queen Anne Dr & 3rd Ave N, King, WA

Built 1935 Load: 39.0 t ADT: 125,000

I-5

Over: S 336TH ST

0.8 N JCT SR 18, King, WA

Built 1959 Load: 39.2 t ADT: 89,140

MARINE VIEW DR

Over: SALTWATER STATE PARK

2.6 MI NW OF JCT SR99, King, WA

Built 1934 Load: 39.9 t ADT: 3,507

I-5

Over: DUWAMISH R RR CITY ST

0.4 N JCT SR 599, King, WA

Built 1964 Load: 39.9 t ADT: 94,284

I-5

Over: DUWAMISH R RR CITY ST

0.4 N JCT SR 599, King, WA

Built 1964 Load: 39.9 t ADT: 94,284

I-405

Over: GREEN RIVER

0.9 N JCT I-5, King, WA

Built 1964 Load: 39.9 t ADT: 153,756

I-5

Over: TERRAIN

5.6 N JCT SR 900, King, WA

Built 1967 Load: 39.9 t ADT: 22,370

FERRY TRAFFIC

Over: PUGET SOUND @ SEATTLE

W END YESLER WAY, King, WA

Built 2019 Load: 40.2 t ADT: 10,212

NE MONEY CREEK RD

Over: MONEY CREEK

2.0 MI SOUTH OF SR 2, King, WA

Built 1958 Load: 40.5 t ADT: 30

I-90

Over: COUNTY ROAD(OLD I-90)

17.3 E JCT SR 202, King, WA

Built 1971 Load: 40.8 t ADT: 17,937

I-90

Over: RAGING RIVER

7.5 E JCT SR 900, King, WA

Built 1975 Load: 40.8 t ADT: 29,903

I-90

Over: E FK ISSAQUAH CR

2.6 E JCT SR 900, King, WA

Built 1976 Load: 40.8 t ADT: 33,574

EAST MARGINAL WAY

Over: DUWAMISH RIVER

0.14 N JCT INTERURBAN AVE, King, WA

Built 1989 Load: 40.8 t ADT: 13,500

COAL CREEK PKWY

Over: MAY CREEK

0.25 MI N OF SE 95TH WAY, King, WA

Built 2009 Load: 40.8 t ADT: 32,000

I-90

Over: DENNY CREEK

19.8 E JCT SR 202, King, WA

Built 1981 Load: 41.1 t ADT: 18,185

AVONDALE ROAD

Over: BEAR CREEK

4.7 MI E OF SR-405, King, WA

Built 1995 Load: 41.1 t ADT: 23,710

I-90 EB

Over: BUS DEPOT,PED PATH,BLDNS

0.2 W JCT I-5, King, WA

Built 2003 Load: 41.7 t ADT: 19,194

S LUCILE ST

Over: RR TRACKS

S Lucile St & Airport Way, King, WA

Built 1981 Load: 41.7 t ADT: 10,511

STARFIRE WAY

Over: GREEN RIVER

0.1 MI NW FORT DENT WAY, King, WA

Built 1975 Load: 42.4 t ADT: 1,150

I-5

Over: MILITARY RD

2.6 N JCT SR 18, King, WA

Built 1959 Load: 42.6 t ADT: 94,670

I-5

Over: MILITARY RD

4.4 N JCT SR 18, King, WA

Built 1960 Load: 42.6 t ADT: 94,670

I-90

Over: S FK SNOQUALMIE R

6.3 E JCT SR 202, King, WA

Built 1974 Load: 42.6 t ADT: 18,182

UNION HILL ROAD

Over: BEAR CREEK

0.1 W AVONDALE RD, King, WA

Built 1994 Load: 42.6 t ADT: 23,866

LAKE TAPPS PARKWAY

Over: E VALLEY HIGHWAY

LAKE TAPPS PKY @ E VALLEY, King, WA

Built 2003 Load: 42.6 t ADT: 17,243

SOUTHCENTER BLVD

Over: GREEN RIVER

0.12 MI E INTRURBAN AVE S, King, WA

Built 1994 Load: 43.1 t ADT: 10,616

I-5

Over: TERRAIN

4.5 N JCT SR 900, King, WA

Built 1966 Load: 43.5 t ADT: 120,321

SR 520 W-N RAMP

Over: NORTHUP WAY

JCT I-405, King, WA

Built 1993 Load: 43.5 t ADT: 12,263

51ST AVE SOUTH

Over: SOUTHCENTER BLVD

0.06 MI N SR-518 UC BR, King, WA

Built 1996 Load: 43.5 t ADT: 4,180

83RD AVE S

Over: CATTLE CROSSING

0.7 MI E OF SR-167, King, WA

Built 1990 Load: 43.7 t ADT: 18,758

SW 34TH STREET

Over: SPRINGBROOK CREEK

0.2 MI WEST LIND AVE, King, WA

Built 2007 Load: 43.7 t ADT: 1,900

DIABLO CAMP ROAD

Over: DIABLO TAILRACE

Diablo Powerhouse, King, WA

Built 1962 Load: 44.1 t ADT: 205

I-5

Over: TERRAIN

2.1 N JCT I-90, King, WA

Built 1962 Load: 44.4 t ADT: 10,636

I-5

Over: TERRAIN

2.1 N JCT I-90, King, WA

Built 1964 Load: 44.4 t ADT: 3,999

I-90

Over: BNRR (REMOVED)

3.0 E JCT SR 202, King, WA

Built 1976 Load: 44.4 t ADT: 20,098

I-90

Over: BNRR (REMOVED)

3.0 E JCT SR 202, King, WA

Built 1976 Load: 44.4 t ADT: 20,098

I-90

Over: EAST CHANNEL-LK WASH

5.9 E JCT I-5, King, WA

Built 1981 Load: 44.4 t ADT: 61,610

YESLER WAY

Over: 5TH AVE S

5th Ave S & Yesler Way, King, WA

Built 1912 Load: 44.4 t ADT: 7,215

CELL PHONE RAMP

Over: S 170TH

1 MI S OF SR 518, King, WA

Built 1972 Load: 44.4 t ADT: 4,300

WOODINVILLE DUVALL

Over: TUCK CREEK

0.9 MI W OF SR-203, King, WA

Built 1948 Load: 44.7 t ADT: 10,564

PACIFIC HIGHWAY

Over: DUWAMISH RIVER

0.1 MI N JCT SR599 & SR99, King, WA

Built 2000 Load: 44.7 t ADT: 22,406

LAKEMONT BLVD

Over: HILL SIDE

0.1 MI S OF JCT I-90, King, WA

Built 1998 Load: 44.7 t ADT: 16,261

SR 99

Over: CLOVERDALE ST

2.5 N JCT SR 599, King, WA

Built 1959 Load: 45.4 t ADT: 27,446

SR 520

Over: PEAT BOG

0.2 E JCT I-405, King, WA

Built 1993 Load: 45.4 t ADT: 32,129

INTERURBAN AVE S

Over: GREEN RIVER

0.1 N JCT I-405, King, WA

Built 1963 Load: 46.3 t ADT: 32,860

I-5 RAMP

Over: AIRPORT WAY S

5.9 N JCT SR 900, King, WA

Built 1967 Load: 46.3 t ADT: 3,824

W EMERSON ST

Over: RR TRACKS, ALLEY

1500 W Emerson St, King, WA

Built 1949 Load: 46.3 t ADT: 19,800

SHYBEAR WY NW

Over: WETLAND 1 TRIBUTARY

0.15 M S OF NW TALUS DR, King, WA

Built 2000 Load: 46.3 t ADT: 280

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026