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:

REGIONAL TRAIL

Over: I-90 S-E RAMP

JCT SR 900, King, WA

Built 2011 ADT: 12,101

RAILROAD

Over: SR 167

0.6 N JCT I-405, King, WA

Built 2007 ADT: 37,124

INTERURBAN TRAIL

Over: SR 524 SPUR/I-5 ON-RAMP

0.4 E JCT SR 524, King, WA

Built 2011 ADT: 26,181

PEDESTRIANS

Over: SR 513

0.4 N JCT SR 520, King, WA

Built 2013 ADT: 38,276

SOUND TRANSIT RAIL

Over: I-405, RAMPS

2.6 N JCT I-90, King, WA

Built 2023 ADT: 144,832

SOUND TRANSIT RAIL

Over: I-90 WB, RAMPS, STREET

6.4 E JCT I-5, King, WA

Built 2021 ADT: 68,450

PEDESTRIANS

Over: SR 520, RAMPS, RAILROAD

2.5 E JCT I-405, King, WA

Built 2021 ADT: 86,292

PEDESTRIANS

Over: SR 520, RAMPS

3.0 E JCT I-405, King, WA

Built 2021 ADT: 61,404

RAILROAD

Over: SR 520 RAMPS

2.1 E JCT I-405, King, WA

Built 2023 ADT: 46,948

RAILROAD

Over: W LK SAMMAMISH, RAMPS

4.7 E JCT I-405, King, WA

Built 2023 ADT: 36,948

PEDESTRIAN OX

Over: 1ST AVE S

1ST AVE S & SW 126, King, WA

Built 1959 ADT: 16,500

PEDESTRIAN WALKWAY

Over: 148TH AVENUE

148TH AV SE & SE 16TH ST, King, WA

Built 1975 ADT: 35,325

PEDESTRIAN

Over: RAINIER AVE, MLK JR WAY

Rainier Ave & MLK JR Way, King, WA

Built 1976 ADT: 35,000

PEDESTRIAN

Over: NE 45TH PL

NE 45th Pl & NE Blakeley, King, WA

Built 1900 ADT: 14,500

PEDESTRIAN

Over: DELRIDGE WAY

4500 Delridge Way SW, King, WA

Built 1960 ADT: 21,000

PEDESTRIAN

Over: FAUNTLEROY SW EXPRESSWAY

0.25 MI NORTH 35TH AVE SW, King, WA

Built 1961 ADT: 43,000

PEDESTRIAN

Over: NE PACIFIC ST

Pacific St WO Pacific Pl, King, WA

Built 1970 ADT: 50,400

PEDESTRIAN

Over: 15TH AVE NE

15th Ave NO Campus Pkwy, King, WA

Built 1971 ADT: 16,135

PEDESTRIAN

Over: LAKE WASHINGTON BLVD E

Lake WA Blvd E & Lynn St, King, WA

Built 1910 ADT: 16,000

PEDESTRIAN

Over: MERCER ST

Mercer St w/o 4th Ave N, King, WA

Built 1961 ADT: 10,000

PIKE PLACE MARKET

Over: WESTERN AVE

Stewart St Ped /Western, King, WA

Built 1930 ADT: 10,500

PEDESTRIAN

Over: VIRGINIA ST

Westin Hotel Skybridge, King, WA

Built 1982 ADT: 11,500

PEDESTRIAN

Over: POST AVE, WESTERN AVE

Marion St Ped /Western, King, WA

Built 1976 ADT: 9,000

PEDESTRIAN

Over: ALASKAN WAY

Marion St Ped /Alaskan, King, WA

Built 1908 ADT: 14,300

PEDESTRIAN

Over: 4TH & 5TH AVES

Btwn Jail And Admin blg, King, WA

Built 1984 ADT: 10,760

PEDESTRIAN

Over: HOLMAN ROAD NW

9200 Holman Rd NW, King, WA

Built 1964 ADT: 33,000

PEDESTRIAN

Over: MONTLAKE BLVD (SR 513)

0.6 N JCT SR 520, King, WA

Built 1938 ADT: 41,913

PEDESTRIAN

Over: WESTERN AVE

Pine St Ped /Western Ave, King, WA

Built 1989 ADT: 9,500

PEDESTRIAN

Over: AURORA AVE N (SR 99)

11.8 N JCT SR 509, King, WA

Built 1961 ADT: 29,610

PEDESTRIAN

Over: AURORA AVE N (SR 99)

13.2 N JCT SR 509, King, WA

Built 1966 ADT: 30,420

PEDESTRIAN

Over: AURORA AVE N (SR 99)

8.6 N JCT SR 509, King, WA

Built 1935 ADT: 39,438

PEDESTRIAN

Over: SAND POINT WAY NE

9400 Sand Point Way NE, King, WA

Built 1927 ADT: 12,600

PEDESTRIAN

Over: WESTLAKE AVE N

1505 Westlake Ave N, King, WA

Built 1995 ADT: 4,151

TOLT PIPELINE TR

Over: 155TH AVE NE

0.5 MI EAST OF SR-202, King, WA

Built 1999 ADT: 2,024

INTERURBAN TRAIL

Over: S 180TH STREET

0.2 MI E. JCT SR 181, King, WA

Built 2001 ADT: 10,500

PEDESTRIAN

Over: NE PACIFIC ST

Pacific St EO 15th Ave, King, WA

Built 1981 ADT: 28,000

PEDESTRIAN

Over: 6TH AVE

Pacific Place Skybridge, King, WA

Built 1998 ADT: 15,500

PEDESTRIAN

Over: ALASKAN WAY, RR

2209 Alaskan Way, King, WA

Built 1996 ADT: 15,300

PEDESTRIAN

Over: 3RD AVE

Macy's Skybridge, King, WA

Built 1960 ADT: 85,000

Pedestrian

Over: ELLIOTT AVE

Elliott Ave n/o Bay St, King, WA

Built 1996 ADT: 16,000

PEDESTRIAN

Over: FLORIDA ST, 16TH AVE, RR

16th Ave SW & SW Florida, King, WA

Built 2000 ADT: 2,500

RR

Over: SEAVIEW AVE NW

3500 Seaview Ave NW, King, WA

Built 1900 ADT: 4,971

RR TRACK

Over: W COMMODORE WAY

3400 W COMMODORE WAY, King, WA

Built 1900 ADT: 15,000

PEDESTRIAN

Over: SR 519/E MARTINEZ DR S

0.2 W JCT I-90, King, WA

Built 2006 ADT: 28,008

PEDESTRIAN

Over: ELLIOTT AVE

Olympic Sculpture Park, King, WA

Built 2007 ADT: 14,600

PEDESTRIAN

Over: PIKE ST

W/O 8th Ave & Pike St, King, WA

Built 2002 ADT: 13,000

PEDESTRIAN

Over: PIKE ST

E/O 8th Ave & Pike St, King, WA

Built 2002 ADT: 10,000

PEDESTRIAN

Over: 8TH AVE

N/O 8th Ave & Pike St, King, WA

Built 2008 ADT: 10,000

CENTRAL LINK

Over: 6TH AVE SOUTH

NORTHBOUND MILE POST 0.02, King, WA

Built 2004 ADT: 4,250

CENTRAL LINK

Over: AIRPORT WAY S

SOUTHBOUND MILE POST 0.02, King, WA

Built 2004 ADT: 6,800

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

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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.