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:

CENTRAL LINK

Over: MLK WAY SOUTH

SOUTHBOUND MP 1.68, King, WA

Built 2008 ADT: 3,800

None

Over: 9th Ave

9th Ave, Jefferson/Alder, King, WA

Built 2007 ADT: 1,300

CENTRAL LINK

Over: MLK (S)

.1 MI E OF I-5, King, WA

Built 2008 ADT: 31,700

PEDESTRIAN

Over: PIKE ST

S/O 8th Ave & Pike St, King, WA

Built 2002 ADT: 10,000

CENTRAL LINK

Over: SOUTH CENTER BLVD

0.2 M SOUTH OF S144TH ST, King, WA

Built 2008 ADT: 10,000

Central Conn Trail

Over: 154TH AVE NE

0.5 MI N OF SR-520, King, WA

Built 1960 ADT: 27,900

CENTRAL LINK

Over: BOEING ACCESS RD s

0.1 MI E OF I-5, King, WA

Built 2008 ADT: 33,000

CENTRAL LINK

Over: AIRPRT WAY RAMP

.2 MI W OF I-5, King, WA

Built 2008 ADT: 116,000

CENTRAL LINK

Over: E MARGINAL WAY

.3 MI W OF I-5, King, WA

Built 2008 ADT: 10,000

CENTRAL LINK

Over: E MARGINAL WAY

.1 MI W OF SR 181, King, WA

Built 2008 ADT: 10,000

CENTRAL LINK

Over: S. 112TH STREET

.4 MI W OF I-5, King, WA

Built 2008 ADT: 10,000

CENTRAL LINK

Over: GATEWAY DRIVE

.1 MI W of SR 599, King, WA

Built 2008 ADT: 10,000

CENTRAL LINK

Over: 51ST STREET BRIDGE

.15 N of SR518, King, WA

Built 2008 ADT: 5,000

CENTRAL LINK

Over: S 42ND AVE

.1 MI N of SR518, King, WA

Built 2008 ADT: 5,000

CENTRAL LINK

Over: 42nd AVE/MACADAM

.1 MI S of SR 599, King, WA

Built 2008 ADT: 10,000

CENTRAL LINK

Over: AIRPORT WAY RAMP

.25 MI W OF I-5, King, WA

Built 2008 ADT: 116,000

King county ped br

Over: 4th Ave

King Cty Admn- Courthouse, King, WA

Built 1984 ADT: 16,590

PEDESTRIAN

Over: MONTLAKE BLVD (SR513)

0.9 N JCT SR 520, King, WA

Built 1958 ADT: 41,913

PEDESTRIAN

Over: MONTLAKE BLVD (SR513)

0.8 N JCT SR 520, King, WA

Built 1958 ADT: 41,913

CENTRAL LINK

Over: S 170 ST

0.13 MILES WEST OF HWY 99, King, WA

Built 2008 ADT: 15,000

PEDESTRIANS

Over: SR 99

3.6 N JCT SR 516, King, WA

Built 2008 ADT: 24,576

CENTRAL LINK

Over: SR 99/TUKWILA INTL BLVD

4.9 N JCT SR 516, King, WA

Built 2008 ADT: 30,110

CENTRAL LINK

Over: W-S RAMP TO SR 99

JCT SR 99 AND SR 518, King, WA

Built 2008 ADT: 10,789

CENTRAL LINK

Over: W-S RAMP TO AIRPORT

2.3 E JCT SR 509, King, WA

Built 2008 ADT: 20,213

CENTRAL LINK

Over: N-W RAMP TO SR 518

JCT SR 99 AND SR 518, King, WA

Built 2008 ADT: 4,108

PEDESTRIAN PATH

Over: HIGHLANDS DR NE

YWCA FAMILY VILLAGE, King, WA

PEDESTRIAN PATH

Over: HIGHLANDS DR NE

C DR NE, King, WA

Built 2012 ADT: 32,000

WILDLIFE CORRIDOR

Over: NOVELTY HILL RD

2.5 MI N OF SR 202, King, WA

Built 2013 ADT: 21,200

CENTRAL LINK

Over: AIR CARGO RD

0.2 MI W OF SR-99, King, WA

Built 2015 ADT: 25,000

CENTRAL LINK

Over: S 188TH STREET

1.1 MI W OF SR-99, King, WA

Built 2015 ADT: 50,000

Ped

Over: Western Ave W

W Thomas St / Western Ave, King, WA

Built 2012 ADT: 45,001

ERC TRAIL

Over: LAKE WASHINGTON BLVD

0.1M W COAL CR PKWY/I-405, King, WA

Built 1916 ADT: 7,840

PEDESTRIANS

Over: EASTLAKE

1100 Eastlake Ave E, King, WA

Built 2014 ADT: 6,558

Cross Kirkland Cor

Over: Kirkland Way

.42 W I405 & 85th, King, WA

Built 1900 ADT: 1

Coss Kirkland Cor

Over: NE 68th Street

.16 W 108th Ave N.E., King, WA

Built 1900 ADT: 1

MONORAIL

Over: SEATTLE CITY STREETS

WESTLAKE MALL, King, WA

Built 1961 ADT: 17,700

S 224TH STREET

Over: SR 167, 88TH AVE S

1.7 N JCT SR 516, King, WA

Built 2019 ADT: 11,462

BNSF MAIN LINE

Over: M Street

0.1 MI N OF SR 18, King, WA

Built 2014 ADT: 6,000

BNSF SIDING LINE

Over: M STREET

0.1 MI N OF SR 18, King, WA

Built 2018 ADT: 6,000

Pedestrian

Over: I-5

NE 100th St at I-5 Inters, King, WA

Built 2022 ADT: 94,239

ROAD

Over: S FK SNOQUALMIE RIVER

.2 MI S OF I-90/9035 JCT, King, WA

Built 1927 ADT: 50

ROSS DAM INTAKE

Over: SKAGIT RIVER

Ross Dam, King, WA

POWERLINE RD

Over: OLSON CREEK

Powerline Rd, King, WA

Built 1900 Load: 5.8 t ADT: 25

S MAIN ST

Over: RR

S Main St, 3rd - 4th Ave, King, WA

Built 1982 Load: 6.3 t ADT: 2,300

SE GREEN VALLEY RD

Over: GREEN RIVER

1.5 MI E OF SR-18, King, WA

Built 1950 Load: 8.1 t ADT: 2,500

NE CARNATION FARM

Over: SNOQUALMIE RIVER

0.8 MI W OF SR-203, King, WA

Built 1951 Load: 9.1 t ADT: 1,259

I-90

Over: 4TH AVE NW & TRAIL

1.0 E JCT SR 900, King, WA

Built 1971 Load: 10.7 t ADT: 30,913

PRESTON FALL CITY

Over: RAGING RIVER

2.0 MI NE OF 1-90, King, WA

Built 1962 Load: 11.0 t ADT: 9,212

W NORTH BEND WAY

Over: S FORK SNOQUALMIE RIVER

3.2 MI E OF I-90, King, WA

Built 1941 Load: 11.3 t ADT: 6,500

MCGRAW ST

Over: RAVINE

McGRAW ST & 3RD AVE N, King, WA

Built 1935 Load: 11.8 t ADT: 3,000

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 6, 2026