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)

SR 18

Good

Over: TERRAIN

6.3 E JCT SR 169, King, WA

Built 2001 Load: 70.7 t ADT: 24,754

I-90

Good

Over: GAME CROSSING

3.1 E JCT SR 18, King, WA

Built 1976 Load: 72.6 t ADT: 25,826

I-90

Good

Over: GAME CROSSING

3.1 E JCT SR 18, King, WA

Built 1976 Load: 72.6 t ADT: 25,826

SR 18

Good

Over: 244TH AVE SE

1.2 E JCT SR 169, King, WA

Built 2005 Load: 74.4 t ADT: 16,302

I-405 RAMP

Good

Over: SOUTHCENTER BLVD

0.9 N JCT I-5, King, WA

Built 1994 Load: 75.3 t ADT: 7,007

RAMP

Good

Over: E ISSAQUAH CREEK

2.1 E JCT SR 900, King, WA

Built 2003 Load: 75.3 t ADT: 2,230

SR 202

Good

Over: LITTLE BEAR CREEK

0.1 E JCT SR 522, King, WA

Built 2017 Load: 76.5 t ADT: 39,506

NW WOODBINE WAY

Good

Over: TRAIL - MARY AVE NW

1500 NW WOODBINE WAY, King, WA

Built 1928 Load: 76.8 t ADT: 1,000

SR 99

Good

Over: DETENTION VAULT

0.9 N JCT SR 509, King, WA

Built 2010 Load: 78.9 t ADT: 38,696

N-E RAMP

Good

Over: 4TH AVE S

0.2 W JCT I-90, King, WA

Built 2003 Load: 79.8 t ADT: 7,545

NW SAMMAMISH ROAD

Good

Over: TRIBUTARY 170

0.5 M WEST OF SR-900, King, WA

Built 2008 Load: 80.7 t ADT: 13,500

SW NEVADA ST

Good

Over: LONGFELLOW CREEK

SW Nevada St & 28th Ave, King, WA

Built 1988 Load: 84.4 t ADT: 400

NE 8TH STREET

Good

Over: KELSEY CREEK

0.01 E JCT 132ND AVE NE, King, WA

Built 2018 Load: 85.9 t ADT: 21,950

SR 516

Good

Over: GREEN RIVER

2.3 E JCT I-5, King, WA

Built 1984 Load: 89.8 t ADT: 23,306

SR 202

Good

Over: MEADOWBROOK SLOUGH

5.8 E JCT SR 203, King, WA

Built 1995 Load: 89.8 t ADT: 11,250

W-W RAMP/3RD ST

Good

Over: C ST SW

1.0 E JCT SR 167, King, WA

Built 2002 Load: 89.8 t ADT: 9,187

SMITHERS AVE S

Good

Over: WETLAND

3.0 MI E OF SR 167, King, WA

Built 2017 Load: 96.9 t ADT: 75

Main ST

Good

Over: Stormwater Facility

0.01 W JCT 151 PL, King, WA

Built 2021 Load: 96.9 t ADT: 13,683

SAYBROOK DRIVE

Good

Over: BEAR CREEK

0.1 MI S JCT NE W-DUVALL, King, WA

Built 1992 Load: 96.9 t ADT: 3,000

W Galer Street

Poor

Over: Private Road

Magnolia, Seattle, King, WA

Built 1929

NE INDEX CK RD

Poor

Over: SKYKOMISH RIVER-S FORK

0.1 MI S OF SR-2, King, WA

Built 1930 Load: 5.4 t ADT: 80

284TH AVE NE

Poor

Over: SIKES LAKE

0.6 MI S OF SR-203, King, WA

Built 1978 Load: 8.1 t ADT: 225

42ND AVE SO

Poor

Over: DUWAMISH RIVER

0.04 MI E OF SR-599, King, WA

Built 1949 Load: 10.0 t ADT: 3,185

MEADOWBROOK WAY SE

Poor

Over: SNOQUALMIE RIVER

0.7 MI NE OF SR-202, King, WA

Built 1921 Load: 10.0 t ADT: 2,458

SE MAY VALLEY RD

Poor

Over: FIFTEEN MILE CREEK

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

Built 1932 Load: 10.4 t ADT: 4,279

428TH AVE SE

Poor

Over: N FK SNOQUALMIE R

2.4 MI E OF SR 202, King, WA

Built 1951 Load: 10.7 t ADT: 1,200

SE MUD MT RD

Poor

Over: BOISE CREEK

0.1 MI SE OF SR-410, King, WA

Built 1956 Load: 12.3 t ADT: 947

SE 156TH ST

Poor

Over: ISSAQUAH CREEK

2 MI E OF SR-169, King, WA

Built 1952 Load: 14.3 t ADT: 230

148TH AVE SE

Poor

Over: MAY CREEK

0.8 MI N OF SR-900, King, WA

Built 1951 Load: 14.5 t ADT: 3,900

FURY LAKE RD.

Poor

Over: DEEP CREEK

13.7 MI N OF 1-90, King, WA

Built 1965 Load: 15.6 t ADT: 110

I-90

Poor

Over: LAKE WASHINGTON

1.9 E JCT I-5, King, WA

Built 1940 Load: 17.2 t ADT: 63,053

15TH ST NORTHWEST

Poor

Over: UPRR

0.3 MI E JCT SR 167, King, WA

Built 1972 Load: 17.2 t ADT: 31,879

AMES LK-CARNATION

Poor

Over: AMES CREEK

.2 S OF W SNOQ. RD, King, WA

Built 1924 Load: 19.0 t ADT: 1,988

BARCLAY CREEK ROAD

Poor

Over: BARCLAY CREEK TRIB

ROAD 6024, MP 0.2, King, WA

Built 2006 Load: 20.9 t ADT: 50

4TH AVE S

Poor

Over: ARGO RR YARD

4700 4th Ave S, King, WA

Built 1933 Load: 21.8 t ADT: 28,000

W GARFIELD ST

Poor

Over: MARINA PL, RR, RAVINE

1700 W Garfield St, King, WA

Built 1929 Load: 22.7 t ADT: 18,000

NE 175TH ST

Poor

Over: SWAMP CREEK

0.1 MI S OF SR-522, King, WA

Built 1951 Load: 24.5 t ADT: 300

NEWHALEM PH ROAD

Poor

Over: NEWHALEM CREEK

Newhalem Powerhouse, King, WA

Built 1968 Load: 24.5 t ADT: 65

W MEEKER STREET

Poor

Over: GREEN RIVER

0.1 MI E OF JCT SR-516, King, WA

Built 1958 Load: 25.3 t ADT: 25,000

SR 203

Poor

Over: CHERRY CREEK

17.3 N JCT SR 202, King, WA

Built 1946 Load: 25.6 t ADT: 10,190

S BOEING ACCESS RD

Poor

Over: AIRPORT WAY BAR RAMP

0.2 W E MARGINAL WY, King, WA

Built 1952 Load: 26.2 t ADT: 40,000

252 AVE SE ISSAQ

Poor

Over: ISSAQUAH CREEK

0.1 MI S HOBART-ISS ROAD, King, WA

Built 1951 Load: 27.2 t ADT: 330

EASTLAKE AVE NE

Poor

Over: PORTAGE BAY

3200 EASTLAKE AVE, King, WA

Built 1915 Load: 27.2 t ADT: 35,000

US 2

Poor

Over: STREAM

7.2 E SNOHOMISH CO, King, WA

Built 1937 Load: 29.0 t ADT: 5,562

SR 203

Poor

Over: SLOUGH

0.5 N JCT SR 202, King, WA

Built 1945 Load: 30.8 t ADT: 7,622

SR 203

Poor

Over: SLOUGH

1.4 N JCT SR 202, King, WA

Built 1945 Load: 30.8 t ADT: 7,622

I-90

Poor

Over: BANDERA RD

14.9 E JCT SR 202, King, WA

Built 1972 Load: 33.6 t ADT: 18,144

EASTLAKE AVE NE

Poor

Over: PORTAGE BAY PL E

3200 Eastlake Ave, King, WA

Built 1930 Load: 36.3 t ADT: 36,000

SR 167

Poor

Over: CMSTPP RR

0.8 N JCT SR 516, King, WA

Built 1967 Load: 39.9 t ADT: 59,986

STOSSEL CK RD

Poor

Over: CHERRY CREEK

6.2 MI NE OF KELLY RD, King, WA

Built 1947 Load: 39.9 t ADT: 1,010

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