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:

YESLER WAY

Over: I-5

1.2 N JCT I-90, King, WA

Built 1965 ADT: 139,825

N-W RAMP

Over: I-5

6.9 N JCT SR 900, King, WA

Built 1966 ADT: 139,825

I-90 W-S RAMP

Over: I-5

6.9 N JCT SR 900, King, WA

Built 1965 ADT: 139,825

I-90

Over: I-5

6.9 N JCT SR 900, King, WA

Built 1966 ADT: 139,825

E-N RAMP

Over: I-5

6.9 N JCT SR 900, King, WA

Built 1965 ADT: 139,825

I-5 S-E RAMP

Over: I-5, RAMPS, RAILROAD

7.1 N JCT SR 900, King, WA

Built 1965 ADT: 139,825

I-5

Over: DEARBORN ST

JCT I-90, King, WA

Built 1965 ADT: 21,770

I-5

Over: DEARBORN ST

JCT I-90, King, WA

Built 1965 ADT: 21,770

I-5 NBCD

Over: DEARBORN ST

JCT I-90, King, WA

Built 1965 ADT: 21,770

I-5 SBCD

Over: DEARBORN ST

JCT I-90, King, WA

Built 1965 ADT: 21,770

S-W RAMP

Over: AIRPORT WAY S

JCT I-90, King, WA

Built 1966 ADT: 5,480

I-90 WCD RAMP

Over: DEARBORN STREET

JCT I-90, King, WA

Built 1965 ADT: 20,500

DEARBORN-N RAMP

Over: I-5 NBCD

JCT I-90, King, WA

Built 1965 ADT: 15,180

I-90

Over: I-5

JCT I-5, King, WA

Built 1966 ADT: 9,982

I-405

Over: N-W RAMP

3.6 N JCT I-90, King, WA

Built 1965 ADT: 8,168

I-405

Over: N-W RAMP

3.6 N JCT I-90, King, WA

Built 1966 ADT: 8,168

I-405

Over: SR 520

JCT I-405, King, WA

Built 1966 ADT: 86,292

I-405

Over: SR 520

JCT I-405, King, WA

Built 1966 ADT: 86,292

N-W RAMP

Over: SR 520

JCT I-405, King, WA

Built 1966 ADT: 64,231

S 144TH ST

Over: I-5, SOUND TRANSIT RR

0.9 N JCT I-405, King, WA

Built 1965 ADT: 230,246

I-5 P1 15559 RAMP

Over: I-5, HOV LANE

1.5 N JCT I-405, King, WA

Built 1966 ADT: 169,761

I-5

Over: INTERURBAN AVE

0.1 N JCT SR 599, King, WA

Built 1966 ADT: 17,498

I-5

Over: INTERURBAN AVE

0.1 N JCT SR 599, King, WA

Built 1966 ADT: 20,516

S BOEING ACCESS RD

Over: I-5

0.5 N JCT SR 900, King, WA

Built 1966 ADT: 185,464

SR 599

Over: I-5 (SB LANES ONLY)

1.5 N JCT I-405, King, WA

Built 1966 ADT: 84,881

SR 900

Over: I-5

1.6 N JCT SR 599, King, WA

Built 1966 ADT: 190,540

SR 900

Over: I-5

1.3 N JCT SR 599, King, WA

Built 1966 ADT: 188,568

NE 44TH ST

Over: I-405

2.0 N JCT SR 900, King, WA

Built 1965 ADT: 137,350

LAKE WASHINGTON BV

Over: I-405

3.8 N JCT SR 900, King, WA

Built 1965 ADT: 143,139

I-405

Over: COAL CREEK PARKWAY SE

4.8 N JCT SR 900, King, WA

Built 1965 ADT: 29,232

I-405

Over: COAL CREEK PARKWAY SE

4.8 N JCT SR 900, King, WA

Built 1965 ADT: 29,232

ALBRO ST

Over: I-5

3.9 N JCT SR 900, King, WA

Built 1966 ADT: 190,268

BEACON-HOLGATE

Over: I-5

6.5 N JCT SR 900, King, WA

Built 1966 ADT: 247,063

I-5

Over: N-W RAMP

3.9 N JCT SR 900, King, WA

Built 1966 ADT: 3,978

E-N RAMP

Over: I-5

3.9 N JCT SR 900, King, WA

Built 1966 ADT: 190,268

NB I5 OFF RAMP

Over: W-S, I5, EB W SEA FRWY

5.6 N JCT SR 900, King, WA

Built 1967 ADT: 189,801

I-5 N - 6TH RAMP

Over: E-6TH RAMP EB LANES

5.6 N JCT SR 900, King, WA

Built 1967 ADT: 28,260

E-N RAMP

Over: I-5

5.6 N JCT SR 900, King, WA

Built 1966 ADT: 189,801

W-S RAMP

Over: I-5 MAINLINE AND RAMPS

5.6 N JCT SR 900, King, WA

Built 1967 ADT: 189,801

I-5

Over: E-S RAMP BR

5.5 N JCT SR 900, King, WA

Built 1967 ADT: 2,500

I-5

Over: 6TH-S RAMP BR

5.5 N JCT SR 900, King, WA

Built 1967 ADT: 2,500

I-5 SB OFF RAMP

Over: S-E RAMP TO COLUMBIA WAY

5.6 N JCT SR 900, King, WA

Built 1967 ADT: 189,801

SPOKANE ST WB LANE

Over: I-5

5.6 N JCT SR 900, King, WA

Built 1967 ADT: 189,801

SPOKANE ST EB LANE

Over: I-5

5.5 N JCT SR 900, King, WA

Built 1966 ADT: 189,801

I-405

Over: SR 900 / N PARK DR

JCT I-405, King, WA

Built 1966 ADT: 25,253

I-405

Over: SR 900 / N PARK DR

JCT I-405, King, WA

Built 1966 ADT: 25,253

SR 520

Over: 108TH AVE NE

5.2 E JCT SR 513, King, WA

Built 1966 ADT: 15,083

S 129TH ST

Over: I-5

0.5 N JCT SR 599, King, WA

Built 1966 ADT: 188,568

RAMP TO I-5 NB/SB

Over: CITY STS, RAMP & RR

3.8 N JCT SR 900, King, WA

Built 1966 ADT: 13,467

N-N RAMP

Over: SR 599 SB / SR 99 SB

1.7 N JCT I-5, King, WA

Built 1966 ADT: 20,073

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

Related

Browse all → | Rankings →

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 5, 2026