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)

N.W.DOGWOOD ST

Good

Over: ISSAQUAH CK

0.2W FRONT ST, King, WA

Built 2015 Load: 34.3 t ADT: 4,500

I-5

Good

Over: TERRAIN

3.0 N JCT I-90, King, WA

Built 1963 Load: 34.5 t ADT: 3,835

SR 167 ON RAMP SB

Good

Over: GARRISON CR TRIBUTARY

1.8 N JCT SR 516, King, WA

Built 1986 Load: 34.5 t ADT: 8,458

SE 208TH ST

Good

Over: ROCK CREEK

4.2 E ISSAQ-HOBART, King, WA

Built 1994 Load: 34.7 t ADT: 200

SKAGIT KEY

Good

Over: COAL CREEK

0.06 WEST JCT CASCADE KEY, King, WA

Built 2017 Load: 34.7 t ADT: 340

NE 116TH ST

Good

Over: RAILROAD

0.1 W I-405, King, WA

Built 2012 Load: 35.0 t ADT: 18,100

Rainier Blvd. N.

Good

Over: East Fork Issaquah Creek

0.3 MI S OF I-90, King, WA

Built 2004 Load: 35.0 t ADT: 7,500

SR 99 OFF RAMP

Good

Over: RAMP AND TERRAIN

4.3 N JCT SR 509, King, WA

Built 2019 Load: 35.3 t ADT: 13,058

W Lk Sam Pkwy SE

Good

Over: Tibbetts Creek

NW Sam at State Park Ent, King, WA

Built 2001 Load: 35.3 t ADT: 12,000

244TH AVE NE

Good

Over: WETLAND

0.3 MI S OF NE 8TH ST, King, WA

Built 2010 Load: 35.3 t ADT: 2,700

I-405

Good

Over: TERRAIN

8.7 N JCT SR 520, King, WA

Built 1968 Load: 35.4 t ADT: 10,673

SR 203

Good

Over: SLOUGH

16.4 N JCT SR 202, King, WA

Built 1984 Load: 35.4 t ADT: 10,190

SR 169

Good

Over: CEDAR RIVER

3.6 N JCT SR 516, King, WA

Built 1991 Load: 35.4 t ADT: 21,491

SR 520 E-N RAMP

Good

Over: NORTHUP WAY

JCT I-405, King, WA

Built 1993 Load: 35.4 t ADT: 8,270

ROAD # 50

Good

Over: EAST CREEK

0.3 MI N 50/54 JCT, King, WA

Built 1995 Load: 35.4 t ADT: 33

WAYNITA DRIVE NE

Good

Over: SAMMAMISH RIVER

0.3 S SR 522, King, WA

Built 1947 Load: 35.4 t ADT: 11,484

I-5

Good

Over: TERRAIN

2.5 N JCT I-90, King, WA

Built 1962 Load: 35.6 t ADT: 13,125

SR 99

Good

Over: SR 519 (ATLANTIC ST)/RR

3.5 N JCT SR 509, King, WA

Built 2011 Load: 35.6 t ADT: 50,463

134TH AVE NE

Good

Over: KELSEY CREEK

0.5 MI S OF SR-520, King, WA

Built 1987 Load: 35.6 t ADT: 2,329

I-405 N-E RAMP

Good

Over: NORTHUP WAY

4.2 N JCT I-90, King, WA

Built 2011 Load: 36.0 t ADT: 5,000

CASCADE KEY

Good

Over: COAL CREEK

0.19 S JCT 118TH AVE SE, King, WA

Built 2018 Load: 36.0 t ADT: 1,217

SR 18

Good

Over: RAGING RIVER

10.6 E JCT SR 169, King, WA

Built 1962 Load: 36.3 t ADT: 24,754

HARRISON ST

Good

Over: SR 99 TUNNEL VOID SPACE

6.1 N JCT SR 509, King, WA

Built 2018 Load: 36.3 t

RAMP

Good

Over: RAILROAD,SHARED USE PATH

JCT SR 520, King, WA

Built 2023 Load: 36.6 t ADT: 7,611

NE SPRING BLVD

Good

Over: SOUND TRANSIT LIGHT RAIL

0.3 MI W OF SR-405, King, WA

Built 2017 Load: 36.9 t ADT: 2,206

N-W RAMP

Good

Over: RAILROAD

4.1 N JCT SR 900, King, WA

Built 1967 Load: 37.2 t ADT: 3,978

US 2

Good

Over: SLOUGH

6.6 E SNOHOMISH CO, King, WA

Built 1989 Load: 37.2 t ADT: 5,562

SR 18

Good

Over: JENKINS CREEK

1.1 E JCT SR 516, King, WA

Built 2002 Load: 37.2 t ADT: 36,767

212TH WAY SE

Good

Over: NEWAUKUM CREEK

0.8 MI S GREEN VALLEY RD, King, WA

Built 2000 Load: 37.3 t ADT: 2,024

SYLVESTER ROAD SW

Good

Over: FOX CREEK

0.7 S SW 160TH, King, WA

Built 2012 Load: 37.3 t ADT: 2,700

NE 31ST STREE

Good

Over: MAY CREEK

0.5 MI E OF I-405, King, WA

Built 2018 Load: 37.3 t ADT: 30

I-5

Good

Over: SDOT MAINTENANCE YARD

JCT I-90, King, WA

Built 1966 Load: 37.6 t ADT: 2,510

M FORK RD NF-5600

Good

Over: UNNAMED TRIBUTARY

9.81 MI N OF I-90, King, WA

Built 2014 Load: 37.6 t ADT: 125

I-405 NBCD

Good

Over: NORTH CREEK

0.6 N JCT SR 522, King, WA

Built 1998 Load: 37.9 t ADT: 9,736

SE 39TH PL

Good

Over: RUTHERFORD SLOUGH

0.4 MI NE OF SR-203, King, WA

Built 2007 Load: 37.9 t ADT: 95

ROAD

Good

Over: BOLT CREEK

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

Built 1988 Load: 38.0 t ADT: 114

SR 164

Good

Over: R ST

1.2 E JCT SR 18, King, WA

Built 1970 Load: 38.1 t ADT: 33,769

SR 599

Good

Over: 133RD ST

0.3 N JCT I-5, King, WA

Built 1966 Load: 38.1 t ADT: 22,020

I-405

Good

Over: CEDAR RIVER

0.9 N JCT SR 515, King, WA

Built 1994 Load: 38.1 t ADT: 84,707

SR 18

Good

Over: CAREY CREEK TRIBUTARY

3.9 E JCT SR 169, King, WA

Built 1995 Load: 38.1 t ADT: 15,143

SW ADMIRAL WAY

Good

Over: RAVINE, FAIRMOUNT AVE

Fairmount Ave SW, King, WA

Built 1949 Load: 38.1 t ADT: 32,000

Spokane St Viaduct

Good

Over: E MARGINAL WY, 1ST, 4TH

S Spokane St & E Marginal, King, WA

Built 2012 Load: 38.1 t ADT: 42,350

SR 520

Good

Over: LAKE WASHINGTON

0.3 E JCT SR 513, King, WA

Built 2023 Load: 38.2 t ADT: 18,960

LK DOROTHY RD SE

Good

Over: BIG BLOWOUT CREEK

9.1 MI N OF I-90, King, WA

Built 2015 Load: 38.2 t ADT: 125

SE 424TH ST

Good

Over: NEWAUKUM CREEK

1.2 MI W OF SR-169, King, WA

Built 1928 Load: 38.6 t ADT: 1,750

NEWPORT KEY

Good

Over: COAL CREEK

0.31 W JCT 118 AVE SE, King, WA

Built 2018 Load: 38.6 t ADT: 287

GLACIER KEY

Good

Over: COAL CREEK

0.2 W JCT CASCADE KEY, King, WA

Built 2019 Load: 38.6 t ADT: 238

NE 165TH STREET

Good

Over: COTTAGE LAKE CREEK

0.5 MI W OF AVONDALE, King, WA

Built 2010 Load: 38.9 t ADT: 2,854

TERMINAL DRIVE NB

Good

Over: S 170TH ST

1 MI S OF SR 518, King, WA

Built 2010 Load: 38.9 t ADT: 35,000

68TH AVE NE

Good

Over: SAMMAMISH RIVER

0.2 MI S OF SR-522, King, WA

Built 2022 Load: 38.9 t ADT: 1

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.