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)

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.

Related

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