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:

I-90

Over: HIGH POINT RD

4.4 E JCT SR 900, King, WA

Built 1975 Load: 17.8 t ADT: 32,655

FOSS RIVER ROAD

Over: FOSS RIVER

0.8 MI SE SR-2 MP 50.6, King, WA

Built 1951 Load: 17.8 t ADT: 40

NE TOLT HILL RD

Over: SNOQUALMIE RIVER

0.5 MI W OF SR-203, King, WA

Built 2008 Load: 17.8 t ADT: 3,200

SR 513

Over: MONTLAKE CUT

0.2 N JCT SR 520, King, WA

Built 1924 Load: 18.1 t ADT: 54,196

I-405

Over: BNRR & 115 AVE NE

0.2 N JCT SR 520, King, WA

Built 1954 Load: 18.1 t ADT: 65,986

I-90

Over: MERCER SLOUGH

6.4 E JCT I-5, King, WA

Built 1970 Load: 18.1 t ADT: 21,966

436TH AVE SE

Over: S FK SNOQUALMIE

0.8 MI S OF I-90, King, WA

Built 1971 Load: 18.1 t ADT: 7,491

SE 68TH ST

Over: RAGING RIVER

1.9 MI NE OF I-90, King, WA

Built 1915 Load: 18.1 t ADT: 15

W EMERSON ST

Over: 15TH AVE W

W Emerson St /15th Ave W, King, WA

Built 1959 Load: 18.1 t ADT: 17,000

SR 99

Over: N 38TH ST

8.3 N JCT SR 509, King, WA

Built 1932 Load: 18.5 t ADT: 53,501

NE CHERRY VLY RD

Over: CHERRY CREEK

2.6 MI E OF SR-203, King, WA

Built 1960 Load: 18.5 t ADT: 2,704

SR 99

Over: N 50TH ST

9.2 N JCT SR 509, King, WA

Built 1933 Load: 18.8 t ADT: 34,369

PRESTON FALL CITY

Over: RAGING RIVER

0.25 MI S OF SR-202, King, WA

Built 1998 Load: 18.8 t ADT: 9,092

I-405

Over: RR & CITY STREETS

0.2 N JCT SR 181, King, WA

Built 1965 Load: 19.0 t ADT: 153,756

W DRAVUS ST

Over: RAILROAD YARDS

1800 W DRAVUS ST, King, WA

Built 1935 Load: 19.0 t ADT: 26,000

S SPOKANE ST

Over: E MARGINAL WY, 1ST, 4TH

S Spokane St & E Marginal, King, WA

Built 1941 Load: 19.0 t ADT: 42,350

SW SPOKANE ST

Over: DELRIDGE WAY SW

1200 SW Spokane St, King, WA

Built 1983 Load: 19.0 t ADT: 98,700

W GARFIELD ST

Over: 15TH AVE W

1600 15th Ave W, King, WA

Built 1957 Load: 19.0 t ADT: 19,500

196TH AVE NE

Over: EVANS CREEK

0.5 MI N OF SR-202, King, WA

Built 1913 Load: 19.1 t ADT: 397

MT. VIEW RD NE

Over: CHERRY CREEK

3.4 MI E OF SR 203, King, WA

Built 1951 Load: 19.1 t ADT: 1,877

MCGILVRA BLVD E

Over: RAVINE

1000 McGILVRA BLVD E, King, WA

Built 1967 Load: 19.1 t ADT: 1,200

148TH AVE NE

Over: HILLSIDE SLOPE

0.1 MI N OF JCT SR-908, King, WA

Built 1991 Load: 19.1 t ADT: 18,000

BRONSON WAY N

Over: CEDAR R

0.2 MI E JCT SR 515, King, WA

Built 1940 Load: 19.4 t ADT: 22,000

US 2

Over: DECEPTION CR

16.0 E SNOHOMISH CO, King, WA

Built 1940 Load: 19.4 t ADT: 4,871

NE MARYMOOR WAY

Over: SAMMAMISH SLOUGH

0.5 MI S OF SR-520, King, WA

Built 1963 Load: 19.4 t ADT: 1,600

EB I-90

Over: LAKE WASHINGTON

2.3 E JCT I-5, King, WA

Built 1940 Load: 19.8 t ADT: 63,053

I-90

Over: MERCER SLOUGH

6.8 E JCT I-5, King, WA

Built 1970 Load: 19.8 t ADT: 3,203

AVONDALE PL NE

Over: BEAR CREEK

4.75 MI E OF SR-405, King, WA

Built 1950 Load: 19.8 t ADT: 135

FERRY TRAFFIC

Over: PUGET SOUND @ SEATTLE

W END MARION ST, King, WA

Built 1964 Load: 20.0 t ADT: 12,000

83RD AVE S

Over: GREEN RIVER

0.7 MI E OF SR-167, King, WA

Built 1990 Load: 20.0 t ADT: 18,758

WOODINVILLE-DUVALL

Over: SNOQUALMIE RIVER

0.1 MI W OF SR-203, King, WA

Built 1951 Load: 20.1 t ADT: 10,564

DRIVE UHLMAN RD E

Over: GREENWATER RIVER

0.2 MI NE OF SR-410, King, WA

Built 1973 Load: 20.4 t ADT: 80

15TH AVE W

Over: SHIP CANAL

4300 15th Ave W, King, WA

Built 1917 Load: 20.4 t ADT: 60,000

163RD PL SE

Over: WETLAND

163 PL & COUGAR MT WAY, King, WA

Built 2000 Load: 20.4 t ADT: 424

SR 202

Over: OVERFLOW CHANNEL

7.5 E JCT SR 203, King, WA

Built 1925 Load: 20.7 t ADT: 11,250

SR 99

Over: N 46TH ST

9.0 N JCT SR 509, King, WA

Built 1933 Load: 20.7 t ADT: 39,438

LOGAN AVE N

Over: CEDAR RIVER

0.4 MI E JCT SR-167, King, WA

Built 1973 Load: 20.7 t ADT: 37,000

SR 509

Over: THAMES CREEK/PED TRAIL

11.0 N JCT I-705, King, WA

Built 1929 Load: 20.9 t ADT: 3,778

ROAD # 55

Over: CARTER CREEK

2.5 MI SW I-90/55 JCT, King, WA

Built 1993 Load: 20.9 t ADT: 25

ROAD

Over: EAGLE CREEK

5.1 MI N OF 6510/6514 JCT, King, WA

Built 2000 Load: 21.1 t ADT: 5

244TH AVE SE

Over: NEWAUKUM CREEK

0.2 MI N OF SR-164, King, WA

Built 1928 Load: 21.1 t ADT: 4,723

SE 256TH ST

Over: SOOS CREEK

SE 256TH ST @ 148 AVE SE, King, WA

Built 1927 Load: 21.1 t ADT: 8,000

KENT-BLK DIAM RD

Over: BIG SOOS CREEK

1.2 MI S OF SR-18, King, WA

Built 1931 Load: 21.1 t ADT: 7,293

NE 45TH ST

Over: 25TH AVE NE

NE 45th St & 25th Ave NE, King, WA

Built 1938 Load: 21.1 t ADT: 18,000

I-90

Over: E FK ISSAQUAH CREEK

2.2 E JCT SR 900, King, WA

Built 1976 Load: 21.4 t ADT: 29,843

UPPER PRESTON RD

Over: LAKE CREEK

1.8 MI SE OF I-90, King, WA

Built 1950 Load: 21.4 t ADT: 1,112

CUMBERLND-KANASKAT

Over: BNSF RR

@ KANASKET KANGLEY RD, King, WA

Built 1959 Load: 21.4 t ADT: 5,000

OLD CASCADE HWY

Over: MALONEY CREEK

0.5 MI S OF SR-2, King, WA

Built 1982 Load: 21.4 t ADT: 450

I-90

Over: MERCER SLOUGH

6.4 E JCT I-5, King, WA

Built 1970 Load: 21.7 t ADT: 31,000

NE 12TH ST

Over: PARKING LOT

NE 12TH & 124TH NE, King, WA

Built 1971 Load: 21.7 t ADT: 18,028

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