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)

SR 509

Good

Over: SO 168TH ST

5.7 N JCT SR 516, King, WA

Built 1979 Load: 42.6 t ADT: 28,216

ROAD

Good

Over: BOULDER CREEK

9.3 MI N OF HW 2/68 JCT, King, WA

Built 1999 Load: 42.7 t ADT: 44

SR 99

Good

Over: SR 509

1.6 N JCT SR 516, King, WA

Built 2022 Load: 42.8 t ADT: 23,887

I-405 N-E RAMP

Good

Over: SR 520 RAMPS

4.6 N JCT I-90, King, WA

Built 2011 Load: 43.1 t ADT: 5,000

28TH TO 24TH AVE S

Good

Over: TERRAIN (FUTURE SR 509)

0.3 MI W OF SR-99, King, WA

Built 2017 Load: 43.4 t ADT: 4,000

NE SPRING BLVD

Good

Over: SOUND TRANSIT LIGHT RAIL

0.2 MI W OF SR-405, King, WA

Built 2017 Load: 43.4 t ADT: 2,206

SR 520

Good

Over: NORTHUP WAY

0.3 E JCT I-405, King, WA

Built 1971 Load: 43.5 t ADT: 43,146

HOV ON/OFF RAMP

Good

Over: I-90

1.2 E JCT I-405, King, WA

Built 2006 Load: 43.5 t ADT: 583

ROAD

Good

Over: HANSEN CREEK

2.8 MI E OF I-90/55 JCT, King, WA

Built 1994 Load: 43.6 t ADT: 25

ROAD

Good

Over: JOHNSON CREEK

5.8 MI N OF HWY 2/65 JCT, King, WA

Built 1991 Load: 43.6 t ADT: 46

ROAD

Good

Over: GREENWATER RIVER

0.1 MI N OF 70/7010 JCT, King, WA

Built 1979 Load: 43.6 t ADT: 48

STONEY CREEK DRIVE

Good

Over: STONEY CREEK

0.1M S. SHANGRI-LA WAY, King, WA

Built 2007 Load: 43.7 t ADT: 350

WITTE ROAD

Good

Over: JENKINS CREEK

0.18 M S OF SE 248TH ST, King, WA

Built 2022 Load: 43.7 t ADT: 8,100

I-90

Good

Over: W SNOQUALMIE IC

1.7 E JCT SR 18, King, WA

Built 1976 Load: 44.1 t ADT: 25,826

SR 520

Good

Over: LAKE WASHINGTON

2.9 E JCT SR 513, King, WA

Built 2016 Load: 44.1 t ADT: 28,189

I-90 EB

Good

Over: TALAPUS CR TRIBUTARY

15.7 E JCT SR 202, King, WA

Built 1972 Load: 44.1 t ADT: 18,193

35TH AVE NE

Good

Over: THORTON CREEK

0.5 MILE EAST OF SR 522, King, WA

Built 2014 Load: 44.1 t ADT: 13,900

I-90

Good

Over: S FK SNOQUALMIE RIVER

1.3 E JCT SR 202, King, WA

Built 1975 Load: 44.4 t ADT: 23,108

I-90

Good

Over: S FK SNOQUALMIE RIVER

1.3 E JCT SR 202, King, WA

Built 1975 Load: 44.4 t ADT: 23,108

I-90 WESTBOUND

Good

Over: Sound Transit Railroad

0.3 E JCT I-5, King, WA

Built 1988 Load: 44.4 t ADT: 52,043

SE 256TH ST

Good

Over: JENKINS CREEK

0.2 N SR 18, King, WA

Built 2002 Load: 44.4 t ADT: 10,000

CW NEAL ROAD

Good

Over: DRAINAGE DITCH

0.3 MI W OF SR-203, King, WA

Built 2007 Load: 44.4 t ADT: 150

WB I-90 RAMP

Good

Over: RELIEF

4.4 E JCT I-5, King, WA

Built 2007 Load: 45.4 t ADT: 434

SR99 OFF RAMP

Good

Over: DETENTION VAULT

5.4 N JCT SR 509, King, WA

Built 2017 Load: 45.4 t ADT: 1,000

SR 164

Good

Over: PUSSYFOOT CREEK

7.9 E JCT SR 18, King, WA

Built 2021 Load: 45.4 t ADT: 10,456

S 116TH ST

Good

Over: DRAINAGE DITCH-RELIEF

0.3 MI W OF SR-99, King, WA

Built 2020 Load: 45.7 t ADT: 6,500

I-5 NBCD RAMP

Good

Over: TERRAIN

JCT I-90, King, WA

Built 1965 Load: 46.3 t ADT: 40,483

SR 518

Good

Over: 42ND AVE S

0.4 E JCT SR 99, King, WA

Built 1966 Load: 46.3 t ADT: 60,822

I-90

Good

Over: ISSAQUAH CREEK

0.9 E JCT SR 900, King, WA

Built 1970 Load: 46.3 t ADT: 44,695

I-90

Good

Over: ISSAQUAH CREEK

0.9 E JCT SR 900, King, WA

Built 1970 Load: 46.3 t ADT: 44,695

US 2

Good

Over: SLOUGH

SNOHOMISH CO LINE, King, WA

Built 1986 Load: 46.3 t ADT: 5,659

US 2

Good

Over: STREAM

0.3 E SNOHOMISH CO, King, WA

Built 1986 Load: 46.3 t ADT: 5,659

SR 18 WESTBOUND

Good

Over: SOOSETTE CREEK

4.7 E JCT SR 164, King, WA

Built 1997 Load: 46.3 t ADT: 27,460

E-N RAMP

Good

Over: 4TH AVE, BUILDINGS

0.2 W JCT I-90, King, WA

Built 2003 Load: 46.3 t ADT: 606

SR 18

Good

Over: TAYLOR CREEK

1.6 E JCT SR 169, King, WA

Built 2004 Load: 46.3 t ADT: 16,302

SR 518 EB OFF RAMP

Good

Over: 8TH AVE

0.2 E JCT SR 509, King, WA

Built 2018 Load: 46.3 t ADT: 5,000

SR 522

Good

Over: SWAMP CREEK

2.1 E JCT SR 104, King, WA

Built 2008 Load: 46.3 t ADT: 34,238

ROAD

Good

Over: GREEN RIVER

7.0 MI W OF TACOMA PASS, King, WA

Built 1963 Load: 46.3 t ADT: 14

S 277TH ST

Good

Over: BNSF RR

0.5 MI EAST OF SR-167, King, WA

Built 2003 Load: 46.3 t ADT: 26,000

S 156TH WAY

Good

Over: MILLER CREEK

0.5 MI S OF SR-518, King, WA

Built 2005 Load: 46.3 t ADT: 10,150

310TH AVE SE

Good

Over: PATTERSON CREEK

0.8 MI N OF SR-202, King, WA

Built 2008 Load: 46.7 t ADT: 338

308TH AVE SE

Good

Over: PATTERSON CREEK

0.2 MI NO OF SR-202, King, WA

Built 2008 Load: 46.7 t ADT: 300

195TH AVE. NE

Good

Over: TRIBUTARY

1.5 MI N OF SR 202, King, WA

Built 2012 Load: 46.7 t ADT: 7,945

135TH AVE NE

Good

Over: Woodin Creek

135TH AVE NE&NE 171ST ST., King, WA

Built 2018 Load: 46.7 t ADT: 2,570

NE 31ST STREET

Good

Over: MAY CREEK

0.3 MI E OF I-405, King, WA

Built 2014 Load: 47.0 t ADT: 50

I-405 S-W RAMP

Good

Over: NORTHUP WAY

0.1 N JCT SR 520, King, WA

Built 1966 Load: 47.2 t ADT: 9,741

SR 522

Good

Over: NORTH CR & GILLMAN TRAIL

5.9 E JCT SR 104, King, WA

Built 1967 Load: 47.2 t ADT: 12,224

SE 248TH ST

Good

Over: ROCK CREEK

1 MI E SR-169 ON SE 248TH, King, WA

Built 2003 Load: 47.2 t ADT: 465

73RD AVE NE

Good

Over: SWAMP CREEK

INTERS. NE 192ND ST, King, WA

Built 2005 Load: 47.2 t ADT: 6,800

LAKEMONT BLVD

Good

Over: LEWIS CREEK

1.0 MI S OF I-90, King, WA

Built 1990 Load: 47.3 t ADT: 12,334

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

Related

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