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)

SE 261ST STREET

Good

Over: LITTLE SOOS CREEK

0.5 MI N OF SR-18, King, WA

Built 2006 Load: 23.6 t ADT: 350

I-5

Good

Over: NORFOLK ST SEWER

1.0 N JCT SR 900, King, WA

Built 1966 Load: 23.7 t ADT: 101,485

NE 45TH ST

Good

Over: 25TH AVE NE

NE 45th St & 25th Ave NE, King, WA

Built 1976 Load: 23.7 t ADT: 25,001

SR 202

Good

Over: BEAR CREEK

7.6 E JCT SR 522, King, WA

Built 1978 Load: 24.5 t ADT: 35,875

SW 16TH STREET

Good

Over: SPRINGBROOK CREEK

0.2 MI S OF I-405, King, WA

Built 1991 Load: 24.5 t ADT: 2,250

SR 203

Good

Over: CLEMONS CREEK

14.6 N JCT SR 202, King, WA

Built 2015 Load: 24.6 t ADT: 12,744

SR 18

Good

Over: CMSTPP RR

0.6 E JCT SR 167, King, WA

Built 1955 Load: 25.3 t ADT: 49,308

SE 244TH ST

Good

Over: TAYLOR CREEK

0.1 S JCT SR 18, King, WA

Built 2005 Load: 25.3 t ADT: 2,212

US 2

Good

Over: TYE RIVER

17.5 E SNOHOMISH CO, King, WA

Built 1947 Load: 25.4 t ADT: 4,871

248 TH AVE SE

Good

Over: NEWAUKUM CREEK

0.2 MI N OF SR-164, King, WA

Built 1939 Load: 25.6 t ADT: 394

PRIVATE DRIVE

Good

Over: LITTLE BEAR CREEK

0.4 N JCT SR 522, King, WA

Built 2006 Load: 25.9 t ADT: 6

140TH AVE NE

Good

Over: KELSEY CREEK

140 NE & BELL-RED RD, King, WA

Built 1972 Load: 25.9 t ADT: 13,668

NORTH FORK RD SE

Good

Over: SUNDAY CREEK

17.4 MI N OF I-90, King, WA

Built 2010 Load: 25.9 t ADT: 70

I-5 RAMP

Good

Over: TERRAIN

5.4 N JCT SR 900, King, WA

Built 1967 Load: 26.6 t ADT: 4,018

ROAD

Good

Over: TUNNEL CREEK

0.5 MI E OF HY 2/6095 JCT, King, WA

Built 1980 Load: 26.6 t ADT: 8

SR 203

Good

Over: DRAINAGE CHANNEL

9.7 N JCT SR 202, King, WA

Built 1946 Load: 26.9 t ADT: 9,247

ROYAL BROUGHAM WAY

Good

Over: RAILROAD

ROYAL BROUGHAM & 4TH AVE, King, WA

Built 2010 Load: 26.9 t ADT: 3,200

I-90 EB ON RAMP

Good

Over: RELIEF

4.4 E JCT I-5, King, WA

Built 1989 Load: 27.2 t ADT: 983

SR 203

Good

Over: DEER CREEK

12.8 N JCT SR 202, King, WA

Built 1946 Load: 27.5 t ADT: 13,128

14/16TH AVE SE

Good

Over: DUWAMISH RIVER

0.8 MI N OF SR-99, King, WA

Built 2014 Load: 27.5 t ADT: 16,000

SR 522

Good

Over: LYON CREEK

1.5 E JCT SR 523, King, WA

Built 2015 Load: 27.9 t ADT: 34,545

150TH PL SE

Good

Over: WETLAND

1.5 MI S OF I-90, King, WA

Built 2002 Load: 27.9 t ADT: 110

15 SW TO SUPERMALL

Good

Over: 15TH ST SW

0.2 MI E OF JCT SR-167, King, WA

Built 1995 Load: 28.1 t ADT: 3,700

I-90

Good

Over: E FK ISSAQUAH CREEK

3.0 E JCT SR 900, King, WA

Built 1976 Load: 28.5 t ADT: 33,574

SE MT. SI RD

Good

Over: MF SNOQUALMIE R

0.9 MI N OF I-90, King, WA

Built 2008 Load: 28.5 t ADT: 3,500

I-90

Good

Over: E FK ISSAQUAH CREEK

2.4 E JCT SR 900, King, WA

Built 1976 Load: 28.8 t ADT: 29,843

SR 18 EASTBOUND

Good

Over: SOOSETTE CREEK

4.7 E JCT SR 164, King, WA

Built 1997 Load: 28.8 t ADT: 27,460

I-5 NBCD

Good

Over: KING JACKSON ST

0.3 N JCT I-90, King, WA

Built 1965 Load: 29.0 t ADT: 55,400

SR 515

Good

Over: GARRISON CREEK

2.1 N JCT SR 516, King, WA

Built 1993 Load: 29.0 t ADT: 26,149

108TH AVE SE

Good

Over: SE 274TH ST

27400 108TH AVE SE, King, WA

Built 1998 Load: 29.2 t ADT: 8,300

NW 195TH CT

Good

Over: BNSF RR

JCT RICH BEACH DR NW, King, WA

Built 2011 Load: 29.2 t ADT: 650

I-90

Good

Over: E FK ISSAQUAH CR

5.6 E JCT SR 900, King, WA

Built 1975 Load: 29.5 t ADT: 32,820

SR 18

Good

Over: SOOS CR

6.7 E JCT SR 164, King, WA

Built 1959 Load: 29.9 t ADT: 25,223

I-5 S-W, N-W RAMPS

Good

Over: AIRPORT WAY

4.1 N JCT SR 900, King, WA

Built 1967 Load: 29.9 t ADT: 12,879

SR 167

Good

Over: 4TH AVE N

1.1 N JCT SR 516, King, WA

Built 1967 Load: 29.9 t ADT: 59,986

SR 167

Good

Over: 4TH AVE N

1.1 N JCT SR 516, King, WA

Built 1967 Load: 29.9 t ADT: 59,986

I-90

Good

Over: S FK SNOQUALMIE RIVER

6.4 E JCT SR 202, King, WA

Built 1971 Load: 29.9 t ADT: 18,493

OAKESDALE AVE SW

Good

Over: SPRINGBROOK CREEK

0.5 M. WEST OF LIND AVE., King, WA

Built 1998 Load: 29.9 t ADT: 7,866

S 277TH ST

Good

Over: UNION PACIFIC RR

0.5 MI EAST OF SR-167, King, WA

Built 2003 Load: 29.9 t ADT: 26,000

ROAD

Good

Over: W FK MILLER RIVER

3.8 MI S OF 6410/OLD HWY, King, WA

Built 1961 Load: 30.0 t ADT: 44

ROAD

Good

Over: GOBLIN CREEK

17 MI NE OF HWY 2/63 JCT, King, WA

Built 1966 Load: 30.0 t ADT: 10

I-405 N-E RAMP

Good

Over: 116TH AVE NE

JCT SR 520, King, WA

Built 1993 Load: 30.5 t ADT: 32,129

W. SUNSET WY

Good

Over: ISSAQUAH CK

0.1 W OF FRONT ST, King, WA

Built 1996 Load: 30.5 t ADT: 9,100

SR 203

Good

Over: SLOUGH

17.2 N JCT SR 202, King, WA

Built 1945 Load: 30.8 t ADT: 10,190

I-5

Good

Over: S 259TH PL

5.6 N JCT SR 18, King, WA

Built 1960 Load: 30.8 t ADT: 100,551

SR 522

Good

Over: NORTH CR & GILLMAN TRAIL

5.9 E JCT SR 104, King, WA

Built 1960 Load: 30.8 t ADT: 12,224

SR 522

Good

Over: NORTH CR & GILLMAN TRAIL

5.9 E JCT SR 104, King, WA

Built 1968 Load: 30.8 t ADT: 11,871

SR 520

Good

Over: 130TH AVE NE

1.0 E JCT I-405, King, WA

Built 1970 Load: 30.8 t ADT: 43,146

SR 520

Good

Over: NE 24TH ST

1.9 E JCT I-405, King, WA

Built 1972 Load: 30.8 t ADT: 43,146

SR 202

Good

Over: SAMMAMISH R

0.4 E JCT SR 522, King, WA

Built 2019 Load: 30.8 t ADT: 8,987

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