King County, WA

1,364 public highway bridges

King County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, King County, Washington contains 1,364 public highway bridges. Roughly 31% are rated “Good,” 33.4% “Fair,” and 3.3% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

1,364

Total Bridges

31%

Good

33.4%

Fair

3.3%

Poor Condition

Condition Distribution

Good

31% (423)

Fair

33.4% (456)

Poor

3.3% (45)

All Bridges (1,364)

Sort:

SR 99

Over: TUKWILA INT'L BLVD

1.8 N JCT I-5, King, WA

Built 1966 ADT: 21,114

S-S RAMP

Over: S 116TH WAY

1.8 N JCT I-5, King, WA

Built 1966 ADT: 1,756

SR 99

Over: TUKWILA INT'L BLVD

1.8 N JCT I-5, King, WA

Built 1966 ADT: 21,114

ABERDEEN AVE NE

Over: SR 900

0.3 E JCT I-405, King, WA

Built 1967 ADT: 24,027

E MARGINAL WAY

Over: SR 599

1.4 N JCT I-5, King, WA

Built 1967 ADT: 40,145

SR 167

Over: SR 516

0.1 E JCT SR 181, King, WA

Built 1967 ADT: 38,206

SR 167

Over: SR 516

0.1 E JCT SR 181, King, WA

Built 1967 ADT: 38,206

SR 167

Over: JAMES ST

0.6 N JCT SR 516, King, WA

Built 1967 ADT: 17,200

12TH AVE S

Over: I-90

0.2 E JCT I-5, King, WA

Built 1968 ADT: 9,982

I-90 RAMP TO I-405

Over: I-90 MAINLINE

JCT I-405, King, WA

Built 1969 ADT: 63,576

W-N RAMP TO I-405

Over: S-W RAMP TO I-90

0.1 E JCT I-405, King, WA

Built 1968 ADT: 12,098

I-90

Over: W-S RAMP RICHARD RD

0.2 E JCT I-405, King, WA

Built 1969 ADT: 20,968

I-90 W-S RAMP

Over: I-90 MAINLINE

JCT I-405, King, WA

Built 1969 ADT: 63,576

I-405

Over: I-90 FACTORIA

JCT I-405, King, WA

Built 1969 ADT: 63,576

I-405 NB HOV

Over: I-90 FACTORIA

JCT I-405, King, WA

Built 1969 ADT: 63,576

I-405 RAMP

Over: EB I-90 RAMP

JCT I-405, King, WA

Built 1969 ADT: 14,083

I-5

Over: N-W RAMP E-N RAMP

2.2 N JCT I-90, King, WA

Built 1967 ADT: 22,473

S 132ND ST PED

Over: SR 509

1.0 N JCT SR 518, King, WA

Built 1968 ADT: 58,437

SR 509

Over: N-N RAMP

4.0 N JCT SR 518, King, WA

Built 1968 ADT: 43,832

CLOVERDALE ST

Over: SR 509

4.0 N JCT SR 518, King, WA

Built 1968 ADT: 43,832

195TH ST

Over: I-405

0.8 N JCT SR 522, King, WA

Built 1968 ADT: 104,974

NP RY FACTORI

Over: INTERSTATE ROUTE 90

7.0 E JCT I-5, King, WA

Built 1967 ADT: 84,429

I-405

Over: SR 522 SAMMAMISH R

1.3 E JCT SR 527, King, WA

Built 1968 ADT: 24,447

I-405

Over: SR 522 SAMMAMISH R

1.3 E JCT SR 527, King, WA

Built 1968 ADT: 24,447

I-405 N-W RAMP

Over: SAMMAMISH R, I-405, SR 5

8.7 N JCT SR 520, King, WA

Built 1968 ADT: 110,142

SR 522

Over: SAMMAMISH RIVER

JCT SR 522, King, WA

Built 1968 ADT: 110,142

S 277TH ST

Over: SR 167

3.6 N JCT SR 18, King, WA

Built 1968 ADT: 112,926

I-90

Over: SR 906 W-W RAMP

JCT I-90, King, WA

Built 1969 ADT: 1,148

160TH/BRICKYARD RD

Over: I-405

7.8 N JCT SR 520, King, WA

Built 1969 ADT: 146,349

SR 900

Over: I-90

6.0 E JCT I-405, King, WA

Built 1970 ADT: 78,544

S136TH ST

Over: SR 509

0.8 N JCT SR 518, King, WA

Built 1969 ADT: 58,437

I-90

Over: MERCER SL

6.4 E JCT I-5, King, WA

Built 1970 ADT: 9,916

I-90

Over: MERCER SLOUGH

6.4 E JCT I-5, King, WA

Built 1940 ADT: 9,916

I-90 S-E RAMP

Over: I-90 MERCER SLOUGH

6.4 E JCT I-5, King, WA

Built 1970 ADT: 136,899

I-90 W-N RAMP

Over: I-90 WBCD

6.4 E JCT I-5, King, WA

Built 1969 ADT: 21,966

NE 124TH ST

Over: I-405

5.5 N JCT SR 520, King, WA

Built 1969 ADT: 127,595

24TH AVE S

Over: SR 518, RAMPS

1.5 E JCT SR 509, King, WA

Built 1970 ADT: 68,142

NE 72ND PLACE

Over: I-405

2.6 N JCT SR 520, King, WA

Built 1970 ADT: 164,679

NE 80TH ST PED

Over: I-405

3.0 N JCT SR 520, King, WA

Built 1970 ADT: 158,156

I-405 NBCD

Over: NE 85TH ST

JCT I-405, King, WA

Built 1970 ADT: 44,198

I-405

Over: NE 85TH ST

JCT I-405, King, WA

Built 1971 ADT: 44,198

I-405

Over: NE 85TH ST

JCT I-405, King, WA

Built 1971 ADT: 44,198

I-405 SBCD

Over: NE 85TH ST

JCT I-405, King, WA

Built 1971 ADT: 44,198

SO 160TH ST

Over: SR 509

6.3 N JCT SR 516, King, WA

Built 1971 ADT: 22,507

S 156TH ST

Over: SR 509

6.5 N JCT SR 516, King, WA

Built 1970 ADT: 35,130

SO 152ND ST

Over: SR 509

6.8 N JCT SR 516, King, WA

Built 1971 ADT: 35,130

SO 146TH ST

Over: SR 509

0.1 N JCT SR 518, King, WA

Built 1970 ADT: 23,969

SR 518

Over: SR 509

7.0 N JCT SR 516, King, WA

Built 1971 ADT: 23,969

S 154TH ST

Over: SR 518

1.9 E JCT SR 509, King, WA

Built 1971 ADT: 51,803

I-405

Over: SE 8TH ST

1.7 N JCT I-90, King, WA

Built 1971 ADT: 19,658

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

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