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:

SR 99

Over: DEXTER WAY N

7.4 N JCT SR 509, King, WA

Built 1930 ADT: 2,167

102ND AVE

Over: STATE ROUTE 522

4.1 E KCT SR 104, King, WA

Built 1950 ADT: 26,944

I-90 E-S RAMP

Over: I-5/AIRPORT WAY RAMP

JCT I-90, King, WA

Built 1965 ADT: 5,379

Central Conn Trail

Over: Redmond Way

0.5 MI N OF SR-520, King, WA

Built 1972 ADT: 27,000

PEDESTRIANS

Over: STATE ROUTE 202

3.9 E JCT SR 203, King, WA

Built 1987 ADT: 9,502

S 212TH ST

Over: SR 167 & SPRINGBROOK CK

2.8 N JCT SR 516, King, WA

Built 1973 ADT: 109,316

PED WALKWAY UC

Over: WEST LAKE SAMMAMISH PKWY

0.5 MI N OF JCT I-90, King, WA

Built 1950 ADT: 8,777

WOODLAND PARK PED

Over: SR 99

9.3 N JCT SR 509, King, WA

Built 1933 ADT: 34,369

WOODLAND PARK PED

Over: SR 99

9.4 N JCT SR 509, King, WA

Built 1933 ADT: 34,369

WOODLAND PARK PED

Over: SR 99

9.5 N JCT SR 509, King, WA

Built 1933 ADT: 34,369

SR 99

Over: DUWAMISH RIVER

0.1 N JCT SR 509, King, WA

Built 1956 ADT: 22,940

SR 18

Over: NPRY & CITY STREETS

1.0 E JCT SR 167, King, WA

Built 1956 ADT: 17,392

SR 18

Over: W VALLEY HWY(OLD SR 181)

2.3 E JCT I-5, King, WA

Built 1957 ADT: 19,821

MILITARY RD

Over: SR 18

1.7 E JCT I-5, King, WA

Built 1958 ADT: 101,558

SR 99

Over: SPOKANE ST

2.1 N JCT SR 509, King, WA

Built 1959 ADT: 14,020

DES MOINES MEM DR

Over: SR 99

1.9 N JCT SR 599, King, WA

Built 1959 ADT: 24,828

SR 18

Over: SR 164

JCT SR 18, King, WA

Built 1959 ADT: 26,034

SR 18

Over: BNRR, AUBURN-BLK DIAMOND

2.3 E JCT SR 164, King, WA

Built 1959 ADT: 9,224

I-5

Over: SR 18

0.3 E JCT SR 161, King, WA

Built 1959 ADT: 66,885

I-5

Over: SR 18

0.3 E JCT SR 161, King, WA

Built 1959 ADT: 66,885

I-5

Over: LAKE WASH SHIP CANAL

2.6 N JCT I-90, King, WA

Built 1962 ADT: 37,212

S 375TH ST

Over: I-5

0.7 N PIERCE CO, King, WA

Built 1959 ADT: 189,657

SR 161

Over: I-5

1.7 N PIERCE CO, King, WA

Built 1959 ADT: 189,657

NE 45TH ST

Over: I-5

1.7 N JCT SR 520, King, WA

Built 1960 ADT: 162,385

NE 50TH ST

Over: I-5

1.7 N JCT SR 520, King, WA

Built 1962 ADT: 162,385

S 320TH ST

Over: I-5

1.8 N JCT SR 18, King, WA

Built 1960 ADT: 158,689

RAMP 45TH TO I-5 N

Over: RAMP NB I-5 TO 50TH

1.7 N JCT SR 520, King, WA

Built 1961 ADT: 8,135

I-5 S RAMP TO 45TH

Over: 50TH RAMP TO I-5 S

1.7 N JCT SR 520, King, WA

Built 1961 ADT: 6,953

I-5

Over: S 272ND ST

4.8 N JCT SR 18, King, WA

Built 1961 ADT: 24,332

I-5

Over: S 272ND ST

4.8 N JCT SR 18, King, WA

Built 1961 ADT: 24,332

ROANOKE ST

Over: I-5

0.1 N JCT SR 520, King, WA

Built 1962 ADT: 147,676

SR 520 W-S RAMP

Over: I-5

0.1 N JCT SR 520, King, WA

Built 1962 ADT: 73,838

SR 18

Over: HOLDER CR HOBART RD

4.6 E JCT SR 169, King, WA

Built 1961 ADT: 8,691

OLIVE WAY

Over: I-5

1.6 N JCT I-90, King, WA

Built 1962 ADT: 181,753

DENNY WAY

Over: I-5

1.6 N JCT I-90, King, WA

Built 1962 ADT: 181,753

YALE ST RAMP

Over: I-5 REV RAMP

1.8 N JCT I-90, King, WA

Built 1962 ADT: 2,424

UITILITY

Over: REV LANES RAMP

1.8 N JCT I-90, King, WA

Built 1963 ADT: 2,424

I-5

Over: DENNY WAY-LAKEVIEW V

1.8 N JCT I-90, King, WA

Built 1962 ADT: 29,296

LAKEVIEW BLVD

Over: I-5

2.2 N JCT I-90, King, WA

Built 1963 ADT: 180,023

EASTLAKE AVE

Over: I-5 RAMPS

2.4 N JCT I-90, King, WA

Built 1963 ADT: 17,125

I-5

Over: SR 516

0.2 E JCT SR 99, King, WA

Built 1962 ADT: 35,066

I-5

Over: SR 516

0.2 E JCT SR 99, King, WA

Built 1962 ADT: 35,066

DELMAR DRIVE

Over: SR 520

0.1 E JCT I-5, King, WA

Built 1963 ADT: 35,304

10TH AVE

Over: SR 520

0.1 E JCT I-5, King, WA

Built 1962 ADT: 35,304

PEDESTRIAN

Over: SR 99

2.2 N JCT SR 599, King, WA

Built 1962 ADT: 24,828

NE 70TH-NE 71ST ST

Over: I-5

2.2 N JCT SR 520, King, WA

Built 1962 ADT: 149,425

8TH AVE N TO I-5 N

Over: I-5 N RAMP TO SR 522 E

JCT I-5, King, WA

Built 1963 ADT: 13,723

I-5 EXP RAMP

Over: I-5 NB,I-5 EXPRESS,RAMP

2.2 N JCT SR 520, King, WA

Built 1962 ADT: 74,713

SR 522

Over: W-S RAMP I-5

2.2 N JCT SR 520, King, WA

Built 1962 ADT: 149,425

I-405

Over: SUNSET BLVD (OLD SR 900)

1.1 E JCT SR 515, King, WA

Built 1963 ADT: 15,456

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 5, 2026