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)

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.

Related

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial