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)

15 STREET NW

Fair

Over: MILL CREEK WETLAND

0.2 MI W OF SR 169, King, WA

Built 2014 Load: 46.3 t ADT: 20,648

364th Ave SE

Fair

Over: RAGING RIVER

6.8 MI E OF ISSA-HO, King, WA

Built 1996 Load: 47.0 t ADT: 160

TINKHAM ROAD

Fair

Over: S.FK. SNOQUALMIE RIVER

I90 EAST EXIT 47, King, WA

Built 1972 Load: 47.1 t ADT: 120

DIABLO ST

Fair

Over: STETATTLE CREEK

Diable Bunkhouse Entrance, King, WA

Built 1941 Load: 47.2 t ADT: 300

DIABLO ACCESS RD

Fair

Over: DIABLO GORGE

Diablo Access Road, King, WA

Built 1962 Load: 47.2 t ADT: 220

I-5

Fair

Over: MILITARY RD

4.4 N JCT SR 18, King, WA

Built 1960 Load: 48.1 t ADT: 94,670

SR 522

Fair

Over: 195TH STREET

0.8 E JCT SR 202, King, WA

Built 1986 Load: 48.1 t ADT: 52,080

SB AIRPORT EXPY

Fair

Over: S 170TH ST

1 MI S OF SR 518, King, WA

Built 1972 Load: 48.1 t ADT: 45,000

184TH AVE SE

Fair

Over: UNNAMED CREEK

1.1 MI W OF SR-18, King, WA

Built 2007 Load: 48.6 t ADT: 75

I-5

Fair

Over: SBCD VIADUCT STA 2195

0.8 N JCT I-90, King, WA

Built 1964 Load: 49.0 t ADT: 49,417

DIABLO DAM ACCESS

Fair

Over: SKAGIT RIVER

Diablo Dam, King, WA

Built 1930 Load: 49.0 t ADT: 250

I-5

Fair

Over: LUCILE ST

3.9 N JCT SR 900, King, WA

Built 1966 Load: 49.9 t ADT: 95,134

NE 128TH WAY

Fair

Over: COTTAGE LAKE CREEK

0.1 MI W of AVONDALE RD, King, WA

Built 1975 Load: 49.9 t ADT: 14,586

SR 18

Fair

Over: CEDAR RIVER, SE BAIN RD

5.2 N JCT SR 516, King, WA

Built 2004 Load: 51.7 t ADT: 16,302

ROAD

Fair

Over: SUNDAY CREEK

0.1MI E OF 52/54 JCT, King, WA

Built 1956 Load: 51.8 t ADT: 14

ISSAQUAH F.C. ROAD

Fair

Over: OLD VAUGHN HILL ROAD

0.2 MI NE OF I-90, King, WA

Built 1985 Load: 51.8 t ADT: 23,000

I-5

Fair

Over: MILITARY RD ROSE ST

2.2 N JCT SR 900, King, WA

Built 1966 Load: 52.6 t ADT: 101,485

ROAD

Fair

Over: SNOW CREEK

0.1MI W OF RD 54/50 JCT, King, WA

Built 1979 Load: 53.6 t ADT: 33

I-405

Fair

Over: NE 3RD ST

0.2 N JCT SR 169, King, WA

Built 1993 Load: 54.4 t ADT: 128,245

SYCAMORE DR S.E.

Fair

Over: ISSAQUAH CK.

0.2 MI E OF ISS-HOBART RD, King, WA

Built 1968 Load: 54.4 t ADT: 550

3RD ST SW

Fair

Over: BNSF RR

0.3 MILES WEST OF SR 18, King, WA

Built 2002 Load: 54.4 t ADT: 22,000

S-W RAMP

Fair

Over: W VALLEY HWY S, MILL CR

2.8 N PIERCE CO, King, WA

Built 1973 Load: 56.2 t ADT: 19,030

SR 99 W-S RAMP

Fair

Over: BNRR, CITY STREET

0.4 N JCT SR 509, King, WA

Built 1996 Load: 56.2 t ADT: 16,753

US 2

Fair

Over: CREEK

13.3 E SNOHOMISH CO, King, WA

Built 1998 Load: 56.2 t ADT: 4,915

I-90

Fair

Over: W SNOQUALMIE IC

1.7 E JCT SR 18, King, WA

Built 1976 Load: 57.7 t ADT: 25,826

SR 18

Fair

Over: BNSF RR SPUR

0.8 E JCT SR 164, King, WA

Built 1986 Load: 57.7 t ADT: 30,974

LAKEMONT BLVD

Fair

Over: RAVINE

0.7 MI S OF JCT I-90, King, WA

Built 1998 Load: 59.3 t ADT: 16,261

NE 106TH ST

Fair

Over: BEAR CREEK

0.1 MI E OF AVONDALE RD, King, WA

Built 1953 Load: 60.8 t ADT: 180

SOUTH 43RD STREET

Fair

Over: HOSPITAL ACCESS ROAD

0.2 MI E JCT SR-167, King, WA

Built 1992 Load: 61.6 t ADT: 34,442

3RD ST SW

Fair

Over: A ST SW

0.3 MILES WEST OF SR-18, King, WA

Built 2002 Load: 61.7 t ADT: 22,000

96th Ave NE

Fair

Over: KC Trail

0.1 S JCT SR 527, King, WA

Built 1989 Load: 61.7 t ADT: 13,151

MACADAM ROAD S.

Fair

Over: S 133RD

0.3 S JCT SR599, King, WA

Built 1997 Load: 62.6 t ADT: 3,600

DIABLO DAM RD

Fair

Over: DIABLO GORGE

Diablo Access Road, King, WA

Built 1962 Load: 64.4 t ADT: 580

ROAD

Fair

Over: TAYLOR RIVER

0.4 MI W OF 56/54 JCT, King, WA

Built 1988 Load: 66.3 t ADT: 2

I-90 EB

Fair

Over: HUMPBACK CREEK

17.5 E JCT SR 202, King, WA

Built 1972 Load: 70.7 t ADT: 18,185

ROAD

Fair

Over: TAYLOR RIVER

12.6 MI W OF I-90/56 JCT, King, WA

Built 1988 Load: 70.8 t ADT: 128

SE 416TH ST

Fair

Over: NEWAUKUM CREEK

0.8 MI E OF SR-169, King, WA

Built 2011 Load: 72.6 t ADT: 1,874

SE 296TH PL

Fair

Over: OLSEN CREEK

.02 MI E OF 118TH AVE SE, King, WA

Built 2018 Load: 80.4 t ADT: 200

AVONDALE ROAD NE

Fair

Over: COTTAGE LAKE CREEK

1.8 MI E OF SR-202, King, WA

Built 1994 Load: 82.0 t ADT: 25,321

SR 520

Fair

Over: 120TH AVE NE

0.3 E JCT I-405, King, WA

Built 1971 Load: 82.5 t ADT: 43,146

NOVELTY HILL RD

Fair

Over: BEAR CREEK

1.0 MI NE OF SR-520, King, WA

Built 1974 Load: 87.1 t ADT: 23,000

S 160TH ST

Fair

Over: AIRPORT EXPRESSWAY

0.25 MI S OF SR 518, King, WA

Built 1970 Load: 89.8 t ADT: 14,500

3RD ST SW

Fair

Over: C ST SW

0.3 W OF SR- 18, King, WA

Built 2002 Load: 89.8 t ADT: 9,500

SE 400TH ST

Fair

Over: NEWAUKUM CREEK

1 MI E 212TH AVE SE, King, WA

Built 1927 Load: 96.9 t ADT: 3,694

384TH AVE SE

Fair

Over: KIMBALL CREEK

1.0 MI N OF I-90, King, WA

Built 1971 Load: 96.9 t ADT: 2,930

OAKESDALE AVE SW

Fair

Over: SPRINGBROOK CREEK

0.25 MI N OF SW 43 ST, King, WA

Built 1979 Load: 96.9 t ADT: 9,325

N.W. JUNIPER ST.

Good

Over: ISSAQUAH CREEK

0.3 W OF FRONT ST. N., King, WA

Built 2005 Load: 8.7 t ADT: 2,800

NEWPORT WAY S.W.

Good

Over: ISSAQUAH CREEK

0.1 MI W OF FRONT ST S, King, WA

Built 2000 Load: 10.4 t ADT: 18,300

I-5

Good

Over: S 288TH ST

3.8 N JCT SR 18, King, WA

Built 1961 Load: 11.0 t ADT: 94,670

S-W & S-E RAMPS

Good

Over: 115TH AVE NE & TRAIL

0.2 N JCT SR 520, King, WA

Built 1966 Load: 11.3 t ADT: 9,741

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

Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.