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:

WEYERHAEUSER WAY S

Over: SR 18

0.7 E JCT I-5, King, WA

Built 1970 ADT: 55,921

W MAIN ST

Over: SR 167

0.1 N JCT SR 18, King, WA

Built 1972 ADT: 43,163

15TH ST NW

Over: SR 167

1.5 N JCT SR 18, King, WA

Built 1972 ADT: 114,151

37TH ST NW

Over: SR 167

2.7 N JCT SR 18, King, WA

Built 1971 ADT: 129,748

SR 518

Over: N-W RAMP, SR 518

1.9 E JCT SR 509, King, WA

Built 1971 ADT: 51,803

I-90

Over: 468TH AVE SE

4.4 E JCT SR 202, King, WA

Built 1971 ADT: 5,568

I-90

Over: 468TH AVE SE

4.4 E JCT SR 202, King, WA

Built 1971 ADT: 5,568

SR 520

Over: 124 AVE NE - NW RAMP

0.6 E JCT I-405, King, WA

Built 1971 ADT: 13,000

SR 520

Over: 124 AVE NE - NW RAMP

0.6 E JCT I-405, King, WA

Built 1971 ADT: 13,000

HANSEN CR RD

Over: I-90

17.1 E JCT SR 202, King, WA

Built 1971 ADT: 35,874

I-90

Over: W LAKE SAMMAMISH PKWY

3.7 E JCT I-405, King, WA

Built 1972 ADT: 15,961

I-90

Over: W LAKE SAMMAMISH PKWY

3.7 E JCT I-405, King, WA

Built 1972 ADT: 15,961

I-90 RAMP

Over: W LAKE SAMMAMISH PKWY

3.7 E JCT I-405, King, WA

Built 1972 ADT: 15,759

150TH AVE SE

Over: I-90

1.7 E JCT I-405, King, WA

Built 1973 ADT: 127,706

150TH AVE SE

Over: I-90

1.7 E JCT I-405, King, WA

Built 1973 ADT: 127,706

TINKHAM RD

Over: I-90

11.7 E JCT SR 202, King, WA

Built 1973 ADT: 36,310

15TH ST SW

Over: SR 167

2.3 N PIERCE CO, King, WA

Built 1975 ADT: 90,546

SR 167 NB

Over: SR 18

2.3 E JCT I-5, King, WA

Built 1973 ADT: 57,729

SR 167

Over: SR 18

2.3 E JCT I-5, King, WA

Built 1973 ADT: 57,729

NB RAMP

Over: N-E RAMP

2.7 N PIERCE CO, King, WA

Built 1975 ADT: 10,288

SR 167 RAMP

Over: SR 18

2.3 E JCT I-5, King, WA

Built 1974 ADT: 57,729

RAMP

Over: I-90, RAMPS, CITY STREET

1.7 E JCT I-405, King, WA

Built 1973 ADT: 127,706

148TH ST-W RAMP

Over: I-90 WBCD RAMP

1.7 E JCT I-405, King, WA

Built 1973 ADT: 2,858

I-405

Over: SE 8TH ST OC

1.7 N JCT I-90, King, WA

Built 1972 ADT: 19,658

SE 231ST ST

Over: SR 18

4.3 E JCT SR 516, King, WA

Built 1972 ADT: 26,396

S EASTGATE PEDESTR

Over: I-90 RAMPS

1.7 N JCT I-405, King, WA

Built 1973 ADT: 7,357

N EASTGATE PEDESTR

Over: EASTGATE WAY & W-S RAMP

1.7 E JCT I-405, King, WA

Built 1973 ADT: 2,858

PEDESTRIAN

Over: I-90

3.3 E JCT I-405, King, WA

Built 1973 ADT: 113,791

I-90

Over: HOMESTEAD VALLEY RD

7.5 E JCT SR 202, King, WA

Built 1974 ADT: 213

I-90

Over: HOMESTEAD VALLEY RD

7.5 E JCT SR 202, King, WA

Built 1974 ADT: 213

I-90

Over: SR 18

12.1 E JCT SR 169, King, WA

Built 1975 ADT: 21,327

I-90

Over: HIGH POINT RD

4.4 E JCT SR 900, King, WA

Built 1975 ADT: 931

436TH AVE SE

Over: I-90

2.3 E JCT SR 202, King, WA

Built 1976 ADT: 37,344

SE 82ND ST

Over: I-90

6.7 E JCT SR 900, King, WA

Built 1975 ADT: 55,271

W-S RAMP I-90

Over: I-90

2.2 E JCT SR 900, King, WA

Built 1976 ADT: 59,685

142ND PL SE

Over: I-90, RAMPS, CITY STREET

1.2 E JCT I-405, King, WA

Built 1976 ADT: 127,706

I-90

Over: SR 202

8.8 E JCT SR 203, King, WA

Built 1976 ADT: 10,067

I-90

Over: SR 202

8.8 E JCT SR 203, King, WA

Built 1975 ADT: 10,067

SR 520

Over: WLS PKWY & SAMMAMISH R

4.9 E JCT I-405, King, WA

Built 1976 ADT: 38,940

PEDESTRIAN TRAFFIC

Over: I-405

2.0 N JCT SR 520, King, WA

Built 1978 ADT: 175,928

CLOSED S 176TH ST

Over: SR 509

5.2 N JCT SR 516, King, WA

Built 1979 ADT: 28,216

SR 509

Over: DES MOINES MEMORIAL

5.8 N JCT SR 516, King, WA

Built 1979 ADT: 5,467

NE 40TH ST

Over: SR 520

3.2 E JCT I-405, King, WA

Built 1980 ADT: 61,404

EQUESTRIAN TRAFFIC

Over: SR 520

4.3 E JCT I-405, King, WA

Built 1980 ADT: 61,404

SR 509

Over: SR 509/DES MOINES MEM

4.7 N JCT SR 516, King, WA

Built 1979 ADT: 9,478

SR 18

Over: SR 516

4.1 E JCT SR 515, King, WA

Built 1979 ADT: 26,572

FLYER STOP PED TRF

Over: SB 405 OFF RAMP TO 72ND

2.6 N JCT SR 520, King, WA

Built 1980 ADT: 5,919

148TH AVE

Over: SR 520

2.3 E JCT I-405, King, WA

Built 1981 ADT: 86,292

NE 30TH ST

Over: SR 405

1.1 N JCT SR 900, King, WA

Built 1981 ADT: 136,172

TALBOT HILL PED.

Over: SR 515

6.2 N JCT SR 516, King, WA

Built 1983 ADT: 23,820

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