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)

NE 116TH STREET

Good

Over: SAMMAMISH RIVER

0.5 MI W OF SR-202, King, WA

Built 2006 Load: 30.8 t ADT: 2,200

SR 167

Good

Over: THIRD AVE SW

0.5 N PIERCE CO, King, WA

Built 1977 Load: 31.1 t ADT: 99,656

I-90

Good

Over: S FK SNOQUALMIE R

7.3 E JCT SR 202, King, WA

Built 1974 Load: 31.7 t ADT: 18,182

SR 900

Good

Over: TIBBETTS CR

9.0 E JCT I-405, King, WA

Built 1975 Load: 31.7 t ADT: 21,488

SW MICHIGAN ST

Good

Over: WETLAND MIT. CHANNEL

UNDER S APPR 99/530, King, WA

Built 1996 Load: 31.7 t ADT: 515

SR 18

Good

Over: KENT-BLACK DIAMOND RD

6.2 E JCT SR 164, King, WA

Built 1996 Load: 31.7 t ADT: 25,223

SR 99

Good

Over: TERRAIN

3.3 N JCT SR 509, King, WA

Built 2011 Load: 31.8 t ADT: 25,232

NO DATA ENTERED

Good

Over: SLIPPERY CREEK TRIB.

NO DATA ENTERED, King, WA

Built 2010 Load: 32.4 t ADT: 50

NE 124TH ST

Good

Over: SNOQUALMIE RIVER

0.5 MI W OF SR 203, King, WA

Built 2000 Load: 32.4 t ADT: 12,222

NE LK WASH. BLVD

Good

Over: MEYDENBAUER BEACH PARK

NE LAKE WASHINGTON BLVD, King, WA

Built 2002 Load: 32.4 t ADT: 6,267

NW 8TH ST

Good

Over: RIBARY CREEK

0.2 MI W OF SR-202, King, WA

Built 2006 Load: 32.4 t ADT: 700

AIRPORT NB-SB LOOP

Good

Over: AIRPORT EXPRESSWAY

0.25 MI S OF SR518, King, WA

Built 2010 Load: 32.4 t ADT: 40,000

62ND WAY NE

Good

Over: WETLAND STREAM

0.75 MI N OF SR-522, King, WA

Built 2010 Load: 32.4 t ADT: 50

124TH AVE NE

Good

Over: SOUND TRANSIT LIGHT RAIL

0.30 N NE 12TH ST, King, WA

Built 2019 Load: 32.4 t ADT: 6,597

Fairview Ave N

Good

Over: Union Bay

1241 Fairview Ave N, King, WA

Built 2021 Load: 32.4 t ADT: 3,600

SR 203

Good

Over: SLOUGH

16.6 N JCT SR 202, King, WA

Built 1945 Load: 32.7 t ADT: 10,190

S-W RAMP

Good

Over: LUCILE ST & RR

4.1 N JCT SR 900, King, WA

Built 1967 Load: 32.7 t ADT: 12,879

SR 518

Good

Over: W-S RAMP

1.9 E JCT SR 509, King, WA

Built 1971 Load: 32.7 t ADT: 51,803

SR 520

Good

Over: 140TH AVE NE

1.6 E JCT I-405, King, WA

Built 1972 Load: 32.7 t ADT: 43,146

SR 520

Good

Over: LAKE WASHINGTON

2.9 E JCT SR 513, King, WA

Built 2016 Load: 32.7 t ADT: 28,189

SR 520

Good

Over: LAKE WASHINGTON

0.7 E JCT SR 513, King, WA

Built 2017 Load: 32.7 t ADT: 18,960

I-90 WB

Good

Over: TALAPUS CR TRIBUTARY

15.7 E JCT SR 202, King, WA

Built 1972 Load: 32.7 t ADT: 18,193

I-90 WB

Good

Over: TALAPUS CREEK

15.6 E JCT SR 202, King, WA

Built 1972 Load: 32.7 t ADT: 18,193

I-5 SB

Good

Over: FALLOUT SHELTER

2.3 N JCT SR 520, King, WA

Built 1963 Load: 32.7 t ADT: 74,713

PARK ENTRANCE

Good

Over: SMITH CREEK

SALTWATER STATE PARK, King, WA

Built 1992 Load: 32.7 t ADT: 850

CAMP LOOP

Good

Over: McSorley Creek

SALTWATER STATE PARK, King, WA

Built 1992 Load: 32.7 t ADT: 50

CAMP LOOP

Good

Over: McSorley Creek

SALTWATER STATE PARK, King, WA

Built 1992 Load: 32.7 t ADT: 50

CAMP LOOP

Good

Over: MCSORLEY CREEK

SALTWATER STATE PARK, King, WA

Built 1992 Load: 32.7 t ADT: 50

SR 900

Good

Over: WETLANDS

8.4 E JCT I-405, King, WA

Built 2002 Load: 32.7 t ADT: 10,744

SE LK DOROTHY RD

Good

Over: UNNAMED TRIBUTARY

5.7 MI N OF I-90, King, WA

Built 2015 Load: 32.7 t ADT: 125

NE W-D RD

Good

Over: TUCK CREEK

1.4 Mi W of SR 203, King, WA

Built 2017 Load: 32.7 t ADT: 10,500

PARKING LOT ROAD

Good

Over: SOUND TRANSIT LIGHT RAIL

W. OF WINTERS HOUSE, King, WA

Built 2023 Load: 32.7 t ADT: 100

112TH AVE SE

Good

Over: SOUND TRANSIT LIGHT RAIL

0.4 Mi N of Bellevue Way, King, WA

Built 2023 Load: 32.7 t ADT: 500

REC PARKING AREA

Good

Over: CHANGE CREEK

0.8 SE JCT I-90, King, WA

Built 1953 Load: 33.0 t ADT: 33

NORVYDAN RD

Good

Over: TAYLOR CREEK

0.01 MI N OF SR-18, King, WA

Built 2005 Load: 33.0 t ADT: 1,600

SR 99

Good

Over: CITY STREETS & RAILROAD

3.3 N JCT SR 509, King, WA

Built 2011 Load: 33.0 t ADT: 25,232

YESLER WAY

Good

Over: 4TH AVE S

4th Ave S & Yesler Way, King, WA

Built 1909 Load: 33.0 t ADT: 8,000

4TH AVE NW

Good

Over: NORTH FORK ISSAQUAH CR

0.3 MI N OF GILMAN, King, WA

Built 2011 Load: 33.0 t ADT: 5,500

ALASKAN WAY SOUTH

Good

Over: BNSF RR

3.6 N JCT SR 509, King, WA

Built 2013 Load: 33.4 t ADT: 8,000

S 228TH STREET

Good

Over: BNSF RR

0.2 MI W OF SR-167, King, WA

Built 2009 Load: 33.4 t ADT: 2,200

I-90

Good

Over: S FK SNOQUALMIE R

7.3 E JCT SR 202, King, WA

Built 1974 Load: 33.6 t ADT: 18,182

N-E RAMP

Good

Over: OCCIDENTAL AVE S

0.4 N JCT SR 509, King, WA

Built 1998 Load: 33.6 t ADT: 16,470

SR 18

Good

Over: CEDAR RIVER, SE BAIN RD

5.2 N JCT SR 516, King, WA

Built 2005 Load: 33.6 t ADT: 16,302

405 NE RAMP

Good

Over: NE RAMP OVER PED PATH

5.7 N JCT SR 900, King, WA

Built 2021 Load: 33.7 t ADT: 35,432

SE LAKE DOROTHY RD

Good

Over: SLIDE DEPRESSION

3.0 MI N OF I-90, King, WA

Built 2011 Load: 33.7 t ADT: 99

Spokane Street

Good

Over: Spokane Street

E Marginal and Spokane St, King, WA

Built 2012 Load: 33.7 t ADT: 10,000

SE 62ND STREET

Good

Over: ISSAQUAH CREEK

0.3 MI N OF I-90, King, WA

Built 2019 Load: 33.7 t ADT: 5,500

ROAD

Good

Over: MONEY CREEK

0.9 MILE FROM COUNTY ROAD, King, WA

Built 2011 Load: 34.0 t ADT: 5

SE JONES ROAD

Good

Over: CEDAR RIVER & TRAIL

0.01 MI E OF SR-169, King, WA

Built 2003 Load: 34.0 t ADT: 4,560

SW SPOKANE ST

Good

Over: RR

SW SPOKANE ST/HARBOR AVE, King, WA

Built 2001 Load: 34.3 t ADT: 8,297

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