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:

E INTERLAKEN BLVD

Over: 26TH AVE E

26TH AVE E & INTERLAKEN, King, WA

Built 1912 Load: 11.8 t ADT: 200

I-5

Over: KING-JACKSON ST

0.3 N JCT I-90, King, WA

Built 1965 Load: 12.3 t ADT: 69,913

SR 520

Over: PORTAGE BAY

0.3 E JCT I-5, King, WA

Built 1963 Load: 12.6 t ADT: 35,304

I-90

Over: FRONT ST N

1.3 E JCT SR 900, King, WA

Built 1971 Load: 12.6 t ADT: 30,913

16TH AVE S

Over: MCSORLEY CREEK

0.1 MI S.OF S 250TH, King, WA

Built 1951 Load: 12.6 t ADT: 10,000

SR 99

Over: LAKE UNION

7.7 N JCT SR 509, King, WA

Built 1931 Load: 12.7 t ADT: 53,501

E BOSTON TERRACE

Over: RAVINE

1660 E BOSTON TERRACE, King, WA

Built 1948 Load: 12.7 t ADT: 160

FRANKLIN ROAD

Over: GREEN RIVER

4.0 MI E OF SR-169, King, WA

Built 1914 Load: 13.0 t ADT: 350

SR 169

Over: NP RY

10.4 N JCT SR 164, King, WA

Built 1939 Load: 13.3 t ADT: 15,203

NE 159TH ST

Over: COTTAGE LAKE CREEK

0.1 MI W OF AVONDALE RD, King, WA

Built 1987 Load: 13.3 t ADT: 1,097

I-90 WB ON RAMP

Over: 224TH AVE NW & TRAIL

1.0 E JCT SR 900, King, WA

Built 1971 Load: 13.6 t ADT: 13,808

I-5

Over: NBCD VIADUCT STA 2195

0.8 N JCT I-90, King, WA

Built 1964 Load: 13.9 t ADT: 30,675

SE 424TH ST

Over: NEWAUKUM CREEK

0.5 MI W OF SR-169, King, WA

Built 1950 Load: 13.9 t ADT: 1,500

SE 416TH ST

Over: NEWAUKUM CREEK

1.1 MI N OF SR-164, King, WA

Built 1950 Load: 14.3 t ADT: 1,592

NE Old Cascade Hwy

Over: TYE RIVER

0.1 MI S OF SR-2, King, WA

Built 1960 Load: 14.3 t ADT: 40

W DRAVUS ST

Over: 15TH AVE W

W Dravus St & 15th Ave W, King, WA

Built 1959 Load: 14.5 t ADT: 21,000

DIABLO ACCESS ROAD

Over: SKAGIT RIVER

Diable Dam, King, WA

Built 1930 Load: 14.5 t ADT: 220

DIABLO DAM ACCESS

Over: SKAGIT RIVER

Diablo Dam, King, WA

Built 1930 Load: 14.5 t ADT: 220

I-90

Over: RICHARDS RD

0.2 E JCT I-405, King, WA

Built 1940 Load: 14.6 t ADT: 63,853

W.B. & REV I-90

Over: LAKE WASHINGTON

2.6 E JCT I-5, King, WA

Built 1989 Load: 14.6 t ADT: 63,053

STATE ROUTE 181

Over: MILL CR

0.1 MI N OF S 277TH ST, King, WA

Built 1954 Load: 14.9 t ADT: 20,000

E-N RAMP

Over: CITY STREET, NPRR

2.4 N JCT SR 509, King, WA

Built 1959 Load: 14.9 t ADT: 10,336

10TH AVENUE NW

Over: SIDE HILL RAVINE

0.1 MI W OF NW INNIS ARD, King, WA

Built 1931 Load: 14.9 t ADT: 730

S FRAGGER ROAD

Over: MULLEN SLOUGH

0.4 MI S JCT SR-516, King, WA

Built 1950 Load: 14.9 t ADT: 1,600

US 2

Over: S FORK SKYKOMISH RIVER

10.3 E SNOHOMISH CO, King, WA

Built 1940 Load: 15.2 t ADT: 4,993

I-5

Over: NORFOLK ST SEWER

1.0 N JCT SR 900, King, WA

Built 1966 Load: 15.2 t ADT: 101,485

WB I-90

Over: LAKE WASHINGTON

2.3 E JCT I-5, King, WA

Built 1989 Load: 15.2 t ADT: 63,053

15th Ave NE

Over: COWEN PARK, RAVINE

15th Ave NE & NE 62nd St, King, WA

Built 1936 Load: 15.2 t ADT: 12,100

212TH WAY SE

Over: GREEN RIVER

0.1 MI S OF GREEN VAL RD, King, WA

Built 1991 Load: 15.2 t ADT: 3,862

OVERLAKE DR

Over: DEPRESSION

0.6 E JCT 84TH AVE, King, WA

Built 1951 Load: 15.4 t ADT: 1,050

MONSTER ROAD SW

Over: BLACK RIVER CHANNEL

0.6 MI S JCT SR-900, King, WA

Built 1998 Load: 15.6 t ADT: 10,670

ISSQ-HOBART RD SE

Over: FIFTEEN MILE CREEK

0.3 MI S OF SE MAY VLY RD, King, WA

Built 1949 Load: 15.9 t ADT: 21,368

HARBOR AVE SW

Over: SW Avalon Way & Railroad

SW Spokane St & Harbor Av, King, WA

Built 2001 Load: 15.9 t ADT: 1,100

S-ALBRO RAMP

Over: TERRAIN

3.9 N JCT SR 900, King, WA

Built 1966 Load: 16.2 t ADT: 8,293

FERRY TRAFFIC

Over: PUGET SOUND @ TAHLEQUAH

SO. END VASHON IS, King, WA

Built 1994 Load: 16.3 t ADT: 1,106

WILLIAMS AVE

Over: CEDAR RIVER

0.2 M N OF SR 900, King, WA

Built 1954 Load: 16.3 t ADT: 1,825

I-5

Over: TERRAIN

4.5 N JCT SR 516, King, WA

Built 1966 Load: 16.5 t ADT: 112,452

VASHON HWY SW

Over: JUDD CREEK

M.P. 5.6 VASHON HWY SW, King, WA

Built 1953 Load: 16.5 t ADT: 4,818

16TH AVE S

Over: MCSORELY CREEK

1.5 MI N OF HW-99, King, WA

Built 1951 Load: 16.5 t ADT: 10,000

I-5

Over: KLICKITAT DR

5.0 N JCT SR 516, King, WA

Built 1965 Load: 16.8 t ADT: 112,452

N.W.GILMAN BLVD.

Over: ISSAQUAH CK.

0.5 MI S OF I-90, King, WA

Built 1940 Load: 16.8 t ADT: 23,500

DAM ACCESS ROAD

Over: WEYERHAEUSER CO HAUL RD

MUD MOUNTAIN DAM, WA, King, WA

Built 1960 Load: 16.8 t ADT: 75

SR 160

Over: PUGET SOUND @ PT VASHON

N END VASHON ISLAND, King, WA

Built 1957 Load: 17.2 t ADT: 7,310

I-90

Over: GARCIA INTERCHANGE

6.5 E JCT SR 202, King, WA

Built 1976 Load: 17.2 t ADT: 18,182

68th Ave NE

Over: SAMMAMISH RIVER

0.5 MI S OF SR 522, King, WA

Built 1970 Load: 17.2 t ADT: 24,000

FISH HATCHERY RD

Over: TOKUL CREEK

0.8 MI S OF SR-202, King, WA

Built 1950 Load: 17.2 t ADT: 120

FAUNTLEROY WAY

Over: ADMIRAL WAY, AVALON WAY

FAUNTLEROY WAY & 35TH AVE, King, WA

Built 1963 Load: 17.2 t ADT: 55,000

W EMERSON PL

Over: RAILROAD

W EMERSON PL & GILMAN AVE, King, WA

Built 1986 Load: 17.2 t ADT: 21,000

BLACK NUGGET RD

Over: N FORK ISSAQUAH CREEK

0.2 MI E OF HIGHLAND DR, King, WA

Built 1992 Load: 17.2 t ADT: 400

BALLFIELD ROAD

Over: TIBBETS CREEK

0.1 MI E OF SR-900, King, WA

Built 1975 Load: 17.2 t ADT: 20

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