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)

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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026