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:

HARBOR AVE SW

Over: RR

SW Spokane St & Admiral, King, WA

Built 2001 Load: 31.8 t ADT: 9,546

WOODINVILLE DUVALL

Over: DUVALL SLOUGH

0.6 MI W OF SR-203, King, WA

Built 1948 Load: 32.1 t ADT: 10,564

SNOQUALMIE RVR RD

Over: PATTERSON CREEK

0.8 MI N OF SR-202, King, WA

Built 1969 Load: 32.4 t ADT: 798

252ND AVE SE

Over: BOISE CREEK

0.1 S OF SR-410, King, WA

Built 1963 Load: 32.4 t ADT: 650

NE 18TH ST

Over: DRAINAGE DITCH

1.6 MI W OF SR-203, King, WA

Built 1965 Load: 32.4 t ADT: 798

218TH AVE NE

Over: COLIN CREEK

1 MI EAST OF AVONDALE, King, WA

Built 1984 Load: 32.4 t ADT: 2,300

SR 203

Over: SLOUGH

1.1 N JCT SR 202, King, WA

Built 1945 Load: 32.7 t ADT: 7,622

SR 203

Over: SLOUGH

16.2 N JCT SR 202, King, WA

Built 1945 Load: 32.7 t ADT: 10,190

I-5

Over: TERRAIN

5.5 N JCT SR 900, King, WA

Built 1967 Load: 32.7 t ADT: 5,638

SR 520

Over: 116TH AVE NE

0.1 E JCT I-405, King, WA

Built 1966 Load: 32.7 t ADT: 43,146

SR 599

Over: 133RD ST

0.3 N JCT I-5, King, WA

Built 1966 Load: 32.7 t ADT: 22,020

I-405

Over: NE 132ND ST

6.1 N JCT SR 520, King, WA

Built 1970 Load: 32.7 t ADT: 63,798

187 AVE SE

Over: LEWIS CREEK

0.7 MI N OF I-90, King, WA

Built 1986 Load: 32.7 t ADT: 205

CEDAR GROVE RD

Over: ISSAQUAH CREEK

2 MI E OF SR-169, King, WA

Built 1962 Load: 32.7 t ADT: 4,568

SW SPOKANE ST

Over: DUWAMISH RIVER E WATERWY

800 SW Spokane St, King, WA

Built 1976 Load: 32.7 t ADT: 8,800

SW SPOKANE ST

Over: E MARGINAL WAY S

1200 SW Spokane St, King, WA

Built 1983 Load: 32.7 t ADT: 10,000

LEARY WAY

Over: SAMMAMISH RIVER

0.4 MILES S JCT SR 908, King, WA

Built 1992 Load: 32.7 t ADT: 30,000

SE 216TH WAY

Over: CEDAR RIVER TRAIL

0.05 MI E OF SR-169, King, WA

Built 1994 Load: 32.7 t ADT: 6,082

EB I-90

Over: OLALLIE CREEK

18.2 E JCT SR 202, King, WA

Built 1972 Load: 32.7 t ADT: 18,185

GORGE POWERHOUSE R

Over: SKAGIT RIVER

Gorge Powerhouse, King, WA

Built 1937 Load: 32.7 t ADT: 145

DIABLO ACCESS RD

Over: WINDY CREEK

Diable Access Bridge, King, WA

Built 1955 Load: 32.7 t ADT: 40

ROSS DAM ROAD

Over: SKAGIT RIVER

Ross Dam, King, WA

Built 1940 Load: 32.7 t ADT: 5

ROSS DAM ROAD

Over: SKAGIT RIVER

Ross Dam, King, WA

Built 1940 Load: 32.7 t ADT: 5

KLICKITAT DRIVE

Over: SB SOUTHCENTER PKWY

AT SOUTHCENTER PARKWAY, King, WA

Built 2012 Load: 32.7 t ADT: 14,024

SR 520 RAMP

Over: PORTAGE BAY

0.8 E JCT I-5, King, WA

Built 1963 Load: 33.4 t ADT: 11,169

LIND AVE SW

Over: P9 CHANNEL/PANTHER CREEK

0.6 MI S OF I-405, King, WA

Built 1981 Load: 33.4 t ADT: 8,345

SR 18

Over: KENT-BLACK DIAMOND RD SE

6.2 E JCT SR 164, King, WA

Built 1959 Load: 33.6 t ADT: 25,223

I-5 REV EXP LANES

Over: RAVENNA BLVD

5.8 N JCT I-90, King, WA

Built 1961 Load: 33.6 t ADT: 34,322

I-5

Over: S 288TH ST

3.8 N JCT SR 18, King, WA

Built 1961 Load: 33.6 t ADT: 94,670

I-5 SBCD

Over: KING JACKSON ST

0.3 N JCT I-90, King, WA

Built 1965 Load: 33.6 t ADT: 66,222

SR 520

Over: 116TH AVE NE

0.1 E JCT I-405, King, WA

Built 1966 Load: 33.6 t ADT: 43,146

I-405

Over: BN RR (ABANDONED)

1.3 N JCT I-90, King, WA

Built 1972 Load: 33.6 t ADT: 95,581

I-90

Over: E FK ISSAQUAH CR

2.7 E JCT SR 900, King, WA

Built 1976 Load: 33.6 t ADT: 33,574

SR 203

Over: TOLT RIVER

5.3 N JCT SR 202, King, WA

Built 1977 Load: 33.6 t ADT: 10,640

KELLY RD NE

Over: CHERRY CREEK

5.2 MI E OF SR-203, King, WA

Built 1947 Load: 33.6 t ADT: 1,561

W GARFIELD ST RAMP

Over: 16TH AVE W

W Garfield St & 23rd Ave, King, WA

Built 1992 Load: 33.6 t ADT: 3,800

W GALER ST

Over: ELLIOTT AVE W, RR

W Galer St & Elliott Ave, King, WA

Built 2000 Load: 34.0 t ADT: 10,000

I-90

Over: 424TH AVE SE

1.5 E JCT SR 202, King, WA

Built 1976 Load: 34.3 t ADT: 23,108

I-90

Over: 424TH AVE SE

1.5 E JCT SR 202, King, WA

Built 1976 Load: 34.3 t ADT: 23,108

SE GREEN VALLEY RD

Over: BURNS CREEK

4.1 MI E OF SR-18, King, WA

Built 1926 Load: 34.3 t ADT: 1,847

SW SPOKANE ST

Over: DUWAMISH RIVER W WATERWY

1200 SW Spokane St, King, WA

Built 1983 Load: 34.3 t ADT: 108,179

I-5 RAMP

Over: PEDESTRIAN PATH

3.1 N JCT I-90, King, WA

Built 1963 Load: 34.5 t ADT: 5,002

I-5

Over: SB VIADUCT STA 2195

1.2 N JCT I-90, King, WA

Built 1964 Load: 34.5 t ADT: 69,913

SR 599

Over: 42ND AVE S

0.7 N JCT I-5, King, WA

Built 1968 Load: 34.5 t ADT: 22,020

SR 167

Over: FIRST AVE N

1.5 N PIERCE CO, King, WA

Built 1977 Load: 34.5 t ADT: 92,898

W GARFIELD ST RAMP

Over: 16TH AVE W

W Garfield St & 23rd Ave, King, WA

Built 1991 Load: 34.5 t ADT: 4,000

NE 90TH ST

Over: SAMMAMISH RIVER

0.5 MI W OF SR-202, King, WA

Built 2001 Load: 34.5 t ADT: 17,500

WEST VALLEY HWY

Over: GREEN RIVER

0.3 MI S OF JCT SR-516, King, WA

Built 1968 Load: 34.7 t ADT: 19,000

SW SPOKANE ST

Over: W WATERWAY OF DUWAMISH

1200 SW Spokane St, King, WA

Built 1991 Load: 34.7 t ADT: 11,000

LANDSBURG ROAD

Over: CEDAR RIVER

1.5 MI N KENT KANGL RD, King, WA

Built 1982 Load: 35.0 t ADT: 5,335

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