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)

Sort:

SR 18

Over: SR 516

4.1 E JCT SR 515, King, WA

Built 1997 ADT: 26,572

SR 519

Over: STADIUM,BNSFRR,4TH AVE

0.2 W JCT I-90, King, WA

Built 2002 ADT: 12,840

S-E RAMP

Over: 4TH AVENUE

0.2 W JCT I-90, King, WA

Built 2003 ADT: 6,420

256TH ST

Over: SR 18

1.5 E JCT SR 516, King, WA

Built 2002 ADT: 33,566

E-E RAMP

Over: N-E RAMP FROM FRONT ST

2.1 E JCT SR 900, King, WA

Built 2003 ADT: 5,668

HIGHLANDS DR

Over: I-90, E FK ISSAQUAH CR

2.1 E JCT SR 900, King, WA

Built 2003 ADT: 59,685

E-N RAMP

Over: I-90, HIGHLANDS DR

2.1 E JCT SR 900, King, WA

Built 2003 ADT: 59,685

S-S RAMP

Over: SR 167, RAMP

JCT I-405, King, WA

Built 2002 ADT: 91,692

PED/EMRGNCY ACCESS

Over: I-405

4.0 N JCT SR 520, King, WA

Built 2002 ADT: 186,135

N-E RAMP

Over: SE 8TH ST

1.7 N JCT I-90, King, WA

Built 2003 ADT: 19,658

NE 8TH ST

Over: I-405

2.7 N JCT I-90, King, WA

Built 2003 ADT: 162,591

NE 4TH ST

Over: I-405

2.4 N JCT I-90, King, WA

Built 2003 ADT: 144,832

RAMP

Over: COLLECTOR DISTRIBUTOR

2.4 N JCT I-90, King, WA

Built 2004 ADT: 16,919

SBCD RAMP

Over: COLLECTOR DISTRIBUTOR

2.4 N JCT I-90, King, WA

Built 2004 ADT: 16,919

NE 6TH ST

Over: 114TH AVE NE, I-405

2.6 N JCT I-90, King, WA

Built 2004 ADT: 72,416

GALER ST PED

Over: SR 99/AURORA AVE N

6.9 N JCT SR 509, King, WA

Built 2004 ADT: 50,006

SR 18

Over: SR 169,MAXWELL,TAYLOR CR

3.8 N JCT SR 516, King, WA

Built 2005 ADT: 21,491

SR 18

Over: SR 169,MAXWELL,TAYLOR CR

3.8 N JCT SR 516, King, WA

Built 2004 ADT: 21,491

SE 200TH

Over: SR 18

2.1 E JCT SR 169, King, WA

Built 2004 ADT: 30,286

S 317TH ST

Over: SB I-5, RAMP

2.0 N JCT SR 18, King, WA

Built 2006 ADT: 79,345

NE 128TH ST

Over: SB I-405

5.7 N JCT SR 520, King, WA

Built 2006 ADT: 63,798

NE 128TH ST

Over: NB I-405

5.7 N JCT SR 520, King, WA

Built 2006 ADT: 63,798

W-W RAMP

Over: SR 202 BNRR

7.7 E JCT SR 522, King, WA

Built 2007 ADT: 35,875

I-405

Over: I-90

JCT I-405, King, WA

Built 2008 ADT: 63,576

NE 10TH STREET

Over: I-405

2.9 N JCT I-90, King, WA

Built 2009 ADT: 162,591

I-90 W-N RAMP

Over: 4TH AVE AND SOUND TRANS

0.4 W JCT I-5, King, WA

Built 2010 ADT: 12,840

BENSON ROAD

Over: I-405

0.1 N JCT SR 515, King, WA

Built 2010 ADT: 91,263

SR 520 W-N RAMP

Over: SAMMAMISH PKWY/RIVER

4.9 E JCT I-405, King, WA

Built 2010 ADT: 38,940

SR 520 N-E RAMP

Over: W L SAMMAMISH PKWY/RIVER

4.9 E JCT I-405, King, WA

Built 2010 ADT: 38,940

NE 12 ST

Over: I-405

3.0 N JCT I-90, King, WA

Built 2011 ADT: 162,591

N-E RAMP

Over: CD RAMP AND TERRAIN

2.8 N JCT I-90, King, WA

Built 2011 ADT: 9,639

I-405-SR 520 NBCD

Over: I-405 N-E & N-W RAMPS

3.1 N JCT I-90, King, WA

Built 2011 ADT: 32,129

PEDESTRIAN XING

Over: US 2

23.8 E SNOHOMISH CO, King, WA

Built 2010 ADT: 4,584

SR 18 E-N RAMP

Over: I-5, SR 18, RAMPS

JCT I-5, King, WA

Built 2012 ADT: 66,885

SR 18 W-S RAMP

Over: I-5 & SR 18

JCT I-5, King, WA

Built 2012 ADT: 66,885

SR 520

Over: 108TH AVE NE

5.2 E JCT SR 513, King, WA

Built 2013 ADT: 15,083

BELLEVUE WAY NE

Over: SR 520

4.9 E JCT SR 513, King, WA

Built 2014 ADT: 52,112

PEDESTRIAN TRAIL

Over: N-E RAMP

4.1 E JCT SR 513, King, WA

Built 2014 ADT: 4,258

N-W RAMP

Over: I-405 N-E RAMP

7.9 N JCT SR 520, King, WA

Built 2015 ADT: 23,472

COLORADO AVE

Over: SR 99

3.9 N JCT SR 509, King, WA

Built 2013 ADT: 19,818

SR 99

Over: SR 99 NB, SR 99 NB/RAMP

5.5 N JCT SR 509, King, WA

Built 2015 ADT: 19,818

SR 99

Over: MERCER ST

5.7 N JCT SR 509, King, WA

Built 2015 ADT: 27,602

SR 167 SB HOV

Over: SR 18

2.3 E JCT I-5, King, WA

Built 2016 ADT: 57,729

N-N RAMP

Over: SR 515

6.9 N JCT SR 516, King, WA

Built 2017 ADT: 46,318

S-S RAMP

Over: SR 515

6.9 N JCT SR 516, King, WA

Built 2017 ADT: 46,318

SR 167 FLYOVER

Over: I-405 NB, SR 167 NB

6.5 N JCT SR 516, King, WA

Built 2018 ADT: 63,355

PEDESTRAIN TRAIL

Over: SR 520

0.3 E JCT SR 513, King, WA

Built 2023 ADT: 37,919

PEDESTRIAN TRAIL

Over: I-405 SOUTHBOUND

1.1 N JCT I-90, King, WA

Built 2023 ADT: 94,000

MAIN ST

Over: I-405

2.2 N JCT I-90, King, WA

Built 2023 ADT: 190,241

INTERURBAN TRAIL

Over: AURORA AVE/SR 99

0.6 N JCT SR 523, King, WA

Built 2009 ADT: 29,570

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

Related

Browse all → | Rankings →

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

P

Compiled by PlainBridges, Independent data publisher

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.