King County, WA

1,364 public highway bridges

King County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, King County, Washington contains 1,364 public highway bridges. Roughly 31% are rated “Good,” 33.4% “Fair,” and 3.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

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

1,364
Total Bridges
31%
Good
33.4%
Fair
3.3%
Poor Condition

Condition Distribution

Good
31% (423)
Fair
33.4% (456)
Poor
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.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.