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)

TIBBETTS CK LN NW

Good

Over: TIBBETS CREEK

0.01 MI S of Shy Bear Way, King, WA

Built 2008 Load: 47.3 t ADT: 525

N 40TH PLACE

Good

Over: MAY CREEK

0.2 MI W OF I-405, King, WA

Built 2007 Load: 47.3 t ADT: 165

SE 424TH ST

Good

Over: WATERCRESS CREEK

0.6 MI W 284TH AVE SE, King, WA

Built 2011 Load: 47.3 t ADT: 140

WESTBOUND I-90

Good

Over: S TRANSIT RR, LAKEVIEW A

1.5 E JCT I-5, King, WA

Built 1989 Load: 47.6 t ADT: 63,053

SR 167 SB OFF-RAMP

Good

Over: SPRINGBROOK CREEK

1.8 N JCT SR 516, King, WA

Built 1986 Load: 48.1 t ADT: 10,099

SR 516

Good

Over: WETLANDS

2.9 E JCT SR 515, King, WA

Built 1994 Load: 48.1 t ADT: 31,532

I-405 RAMP

Good

Over: SOUTHCENTER BLVD

0.9 N JCT I-5, King, WA

Built 1994 Load: 48.1 t ADT: 8,919

SR 18

Good

Over: GREEN RIVER

2.5 E JCT SR 164, King, WA

Built 1995 Load: 48.1 t ADT: 27,460

SR 18

Good

Over: CAREY CREEK

4.0 E JCT SR 169, King, WA

Built 1996 Load: 48.1 t ADT: 15,143

WB I-90

Good

Over: TIBBETTS CREEK

5.4 E JCT I-405, King, WA

Built 2004 Load: 48.1 t ADT: 39,272

EB I-90

Good

Over: TIBBETTS CREEK

5.4 E JCT I-405, King, WA

Built 2004 Load: 48.1 t ADT: 39,272

405 N-E RAMP

Good

Over: 116TH AVE NE

3.8 N JCT I-90, King, WA

Built 2011 Load: 48.3 t ADT: 27,000

E LAKE SAMMAMISH

Good

Over: N FORK ISSAQUAH CREEK

1.3 E JCT SR 900, King, WA

Built 2017 Load: 48.3 t ADT: 35,000

I-405

Good

Over: MAY CREEK

1.8 N JCT SR 900, King, WA

Built 2023 Load: 48.3 t ADT: 72,796

KELLY RD NE

Good

Over: HARRIS CREEK

2.5 MI E OF SR-203, King, WA

Built 2005 Load: 48.3 t ADT: 3,101

Riverview Blvd. S

Good

Over: Veterans Dr.

1.5 MI E OF I-5, King, WA

Built 2007 Load: 48.3 t ADT: 750

108TH AVE NE

Good

Over: YARROW CREEK

5.27 E JCT SR 513, King, WA

Built 2014 Load: 48.6 t ADT: 12,500

SE 416th ST

Good

Over: NEWAUKUM CREEK

0.6 MI E OF SR-169, King, WA

Built 2009 Load: 48.6 t ADT: 1,874

72ND AVENUE SOUTH

Good

Over: Mill Creek

0.25 MI E OF SR-181, King, WA

Built 2017 Load: 48.9 t ADT: 5,000

I-5 NB HOV

Good

Over: SOUTHCENTER BLVD

JCT I-405 & SR 518, King, WA

Built 1996 Load: 49.0 t ADT: 6,776

I-405

Good

Over: NE 116TH ST

5.0 N JCT SR 520, King, WA

Built 2007 Load: 49.0 t ADT: 80,878

I-405

Good

Over: NE 116TH ST

5.0 N JCT SR 520, King, WA

Built 2006 Load: 49.0 t ADT: 80,878

SB I-405 RAMP

Good

Over: BENSON ROAD

0.4 N JCT SR 515, King, WA

Built 2010 Load: 49.0 t ADT: 11,338

ROAD

Good

Over: UNNAMED CREEK

1.7 MI W OF 5403/5405 JCT, King, WA

Built 1995 Load: 49.0 t ADT: 10

ROAD

Good

Over: BOLT CREEK

SEC.24, T26N, R11E, King, WA

Built 1997 Load: 49.0 t ADT: 75

ROAD

Good

Over: HARLAN CREEK

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

Built 1991 Load: 49.0 t ADT: 114

ROAD

Good

Over: BURNS CREEK

0.24 MI S OF 68/6835 JCT, King, WA

Built 1999 Load: 49.0 t ADT: 60

LAKE WA BLVD

Good

Over: MAY CREEK

0.2 MILES SW I-405 EXIT 7, King, WA

Built 1996 Load: 49.0 t ADT: 5,478

S 228th STREET

Good

Over: UPRR

0.3 MI W OF SR-167, King, WA

Built 2021 Load: 49.2 t ADT: 2,200

NORTH FORK RD SE

Good

Over: N FORK SNOQUALMIE RIVER

14.8 MI N OF I-90, King, WA

Built 2008 Load: 49.6 t ADT: 60

SR 203

Good

Over: SLOUGH

1.8 N JCT SR 202, King, WA

Built 1986 Load: 49.9 t ADT: 7,622

SR 18 RAMP

Good

Over: HOLDER CR & HOBART RD

4.6 E JCT SR 169, King, WA

Built 1996 Load: 49.9 t ADT: 912

ISSAQUAH-HOBART RD

Good

Over: HOLDER CREEK

4.6 E JCT SR 169, King, WA

Built 1996 Load: 49.9 t ADT: 8,691

SR 18

Good

Over: TAYLOR CREEK

1.6 E JCT SR 169, King, WA

Built 2005 Load: 49.9 t ADT: 16,302

S 373RD ST

Good

Over: HYLEBOS CREEK

0.25 MI E OF SR-99, King, WA

Built 2007 Load: 49.9 t ADT: 900

TINKHAM ROAD

Good

Over: S.FK. SNOQUALMIE

I90 EAST EXIT 42, King, WA

Built 1972 Load: 50.2 t ADT: 120

S 218TH STREET

Good

Over: GARRISON CREEK

0.25 MI E of SR 167, King, WA

Built 2019 Load: 50.5 t ADT: 3,000

ROAD

Good

Over: TWIN CAMPS CREEK

6.3 MI W OF TACOMA PASS, King, WA

Built 1966 Load: 50.8 t ADT: 14

OFF RAMP 4th AVE

Good

Over: SOUTH SPOKANE STREET

4th Ave S & Spokane St Vi, King, WA

Built 2010 Load: 51.5 t ADT: 24,000

I-5 SB HOV

Good

Over: KLICKITAT DR

JCT I-405, King, WA

Built 1996 Load: 51.7 t ADT: 6,574

SE MAY VALLEY RD

Good

Over: ISSAQUAH CREEK

0.4 MI W OF ISS-HOBART RD, King, WA

Built 2009 Load: 51.8 t ADT: 4,279

LAKESIDE BLVD E

Good

Over: KENT LAKES

23900 LAKESIDE BLVD E, King, WA

Built 1985 Load: 52.2 t ADT: 570

SR 516

Good

Over: MULLEN SLOUGH & DIRT RD.

1.8 E JCT I-5, King, WA

Built 1983 Load: 52.6 t ADT: 23,306

SR 516

Good

Over: BIG SOOS CREEK

3.7 E JCT SR 515, King, WA

Built 1994 Load: 52.6 t ADT: 28,754

SR 18

Good

Over: JENKINS CREEK

2.1 E JCT SR 516, King, WA

Built 2002 Load: 52.6 t ADT: 19,491

SR 18

Good

Over: SE 240TH ST

3.5 E JCT SR 516, King, WA

Built 2002 Load: 52.6 t ADT: 19,491

I-405

Good

Over: SPRINGBROOK/OAKESDALE

0.6 N JCT SR 181, King, WA

Built 2009 Load: 52.6 t ADT: 166,259

S-W RAMP

Good

Over: CAMPUS WAY NE

0.6 W JCT I-405, King, WA

Built 2008 Load: 52.6 t ADT: 8,549

15TH AVE NE

Good

Over: THORNTON CR, RAVINE

10411 15th Ave NE, King, WA

Built 1949 Load: 52.8 t ADT: 9,189

SR 167 OFF RAMP NB

Good

Over: SPRINGBROOK CREEK

1.8 N JCT SR 516, King, WA

Built 1986 Load: 53.5 t ADT: 8,606

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