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)

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

OVERLAKE DR

Poor

Over: DEPRESSION

0.5 E JCT 84TH AVE, King, WA

Built 1951 Load: 15.4 t ADT: 1,050

FURY LAKE RD.

Poor

Over: DEEP CREEK

13.7 MI N OF 1-90, King, WA

Built 1965 Load: 15.6 t ADT: 110

US 2

Poor

Over: ANTHRACITE CREEK

9.8 E SNOHOMISH CO, King, WA

Built 1940 Load: 16.8 t ADT: 4,993

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

4TH AVE S

Poor

Over: PARKING GARAGE

4th Ave S & Jackson St, King, WA

Built 1910 Load: 25.4 t ADT: 27,000

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

KENT-BLK DIAMOND

Poor

Over: BNSF RR

AT SE 291ST, King, WA

Built 1931 Load: 30.8 t ADT: 7,700

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.