Snohomish County, WA

516 public highway bridges

Snohomish County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Snohomish County, Washington contains 516 public highway bridges. Roughly 37.8% are rated “Good,” 37.8% “Fair,” and 3.7% “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.

516
Total Bridges
37.8%
Good
37.8%
Fair
3.7%
Poor Condition

Condition Distribution

Good
37.8% (195)
Fair
37.8% (195)
Poor
3.7% (19)

All Bridges (516)

PIONEER HIGHWAY

Fair

Over: THOMSEN SLOUGH

8.0 E JCT SR 532, Snohomish, WA

Built 1919 Load: 59.9 t ADT: 4,110

25TH AVE WEST

Fair

Over: POWDER MILL GULCH

South of 56th, Snohomish, WA

Built 1993 Load: 99.9 t ADT: 300

I-5

Good

Over: LOWELL ROAD

2.3 N JCT SR 527, Snohomish, WA

Built 1950 Load: 13.3 t ADT: 93,260

I-5

Good

Over: 52ND AVE W

2.3 N JCT SR 104, Snohomish, WA

Built 1963 Load: 13.3 t ADT: 96,309

153rd Street SE

Good

Over: North Creek

0.25 miles west of SR 527, Snohomish, WA

Built 2001 Load: 13.6 t ADT: 900

SR 529

Good

Over: BNRR

1.5 N JCT SR 529 SPUR, Snohomish, WA

Built 1991 Load: 14.3 t ADT: 13,663

I-5

Good

Over: I-405 & RAMPS

1.1 N JCT SR 524, Snohomish, WA

Built 1964 Load: 16.2 t ADT: 75,171

I-5

Good

Over: BNSF RR

5.0 N JCT SR 528, Snohomish, WA

Built 1970 Load: 17.8 t ADT: 54,758

I-5

Good

Over: BNSF RR

5.0 N JCT SR 528, Snohomish, WA

Built 1970 Load: 17.8 t ADT: 54,758

SR 527

Good

Over: NORTH CREEK

0.5 N JCT I-405, Snohomish, WA

Built 1988 Load: 17.8 t ADT: 41,017

MANN RD

Good

Over: HAYSTACK CREEK

2.3 SE JCT SR2, Snohomish, WA

Built 1991 Load: 19.0 t ADT: 1,166

I-5

Good

Over: PILCHUCK CREEK

2.0 N JCT SR 530, Snohomish, WA

Built 1954 Load: 19.1 t ADT: 39,983

I-5

Good

Over: SMITH AVE

3.7 N JCT SR 527, Snohomish, WA

Built 1967 Load: 19.1 t ADT: 88,747

SR 530

Good

Over: FRENCH CREEK

20.2 E JCT SR 9, Snohomish, WA

Built 1982 Load: 19.4 t ADT: 3,499

311 TH AVE SE

Good

Over: SO SLOUGH SKYKOMISH RIVE

0.8 S JCT SR 2, Snohomish, WA

Built 1984 Load: 20.0 t ADT: 2,323

Smith Avenue

Good

Over: Pacific Avenue

Inter Smith Ave & Pacific, Snohomish, WA

Built 2002 Load: 20.1 t ADT: 3,748

ROAD

Good

Over: EVERGREEN CREEK

1.7 MI E OF 6554/110 JCT, Snohomish, WA

Built 1994 Load: 20.9 t ADT: 2

ROAD

Good

Over: RAPID RIVER

0.4 MI E OF 65/6530 JCT, Snohomish, WA

Built 1966 Load: 21.8 t ADT: 8

BEN HOWARD ROAD

Good

Over: ELWELL CREEK

3.1 SW JCT SR 2, Snohomish, WA

Built 1973 Load: 21.8 t ADT: 953

180th St. SE

Good

Over: Thompson Creek

0.3 E SR527, Snohomish, WA

Built 2021 Load: 22.7 t ADT: 11,759

SR 522

Good

Over: 179TH SE & 154TH SE

10.1 E JCT SR 9, Snohomish, WA

Built 1970 Load: 24.5 t ADT: 10,512

OSO LOOP RD

Good

Over: FRY CREEK

0.8 SW JCT SR 530, Snohomish, WA

Built 2003 Load: 24.5 t ADT: 135

I-5

Good

Over: QUILCEDA CREEK

0.9 N JCT SR 528, Snohomish, WA

Built 1953 Load: 24.9 t ADT: 65,521

ROAD

Good

Over: N FK RAPID RIVER

5.0 MI E OF 65/6530 JCT, Snohomish, WA

Built 1969 Load: 25.4 t ADT: 6

SWEDE HEAVEN RD

Good

Over: SEGELSON CREEK

1.7 NW JCT SR 530, Snohomish, WA

Built 1981 Load: 25.4 t ADT: 629

GIBSON RD.

Good

Over: SWAMP CREEK

1.0 W JCT I-5, Snohomish, WA

Built 1995 Load: 25.4 t ADT: 9,000

342nd DR NE

Good

Over: S.F. Stillaguamish River

12.0 E JCT SR 92, Snohomish, WA

Built 2009 Load: 25.9 t ADT: 44

I-5

Good

Over: LOWELL ROAD

2.3 N JCT SR 527, Snohomish, WA

Built 1967 Load: 26.3 t ADT: 93,260

GRANT CREEK RD

Good

Over: GRANT CREEK

0.7 NW JCT SR 530, Snohomish, WA

Built 1984 Load: 26.3 t ADT: 31

Mill Creek Road

Good

Over: Penny Creek

500' E of SR 527, Snohomish, WA

Built 2007 Load: 26.6 t ADT: 17,100

ROAD

Good

Over: BRIDAL VEIL CREEK

1.4 MI E OF HIWAY 2 JCT, Snohomish, WA

Built 1990 Load: 26.8 t ADT: 308

BUCK ISLAND ROAD

Good

Over: WOODS CREEK

0.32 E MAIN ST, Snohomish, WA

Built 1991 Load: 26.9 t ADT: 200

THREE LAKES RD

Good

Over: PILCHUCK RIVER

1.9 N JCT SR 2, Snohomish, WA

Built 1992 Load: 27.2 t ADT: 4,922

SO LK STEVENS RD

Good

Over: SO END LAKE STEVENS

1.6 MI NE JCT SR 9, Snohomish, WA

Built 1995 Load: 27.2 t ADT: 3,700

BEAR CR RD

Good

Over: BEAR CREEK

1.0 NW JCT SR 9, Snohomish, WA

Built 1993 Load: 28.1 t ADT: 1,033

PIONEER HIGHWAY

Good

Over: STILLIGUAMISH RIVER

5.9 E JCT SR 532, Snohomish, WA

Built 1979 Load: 29.0 t ADT: 2,426

SWEDE HEAVEN RD

Good

Over: BLACK CREEK

1.2 NW JCT SR 530, Snohomish, WA

Built 2002 Load: 29.0 t ADT: 746

N. BROOKS CR RD

Good

Over: BROOKS CREEK

0.7 NE JCT SR 530, Snohomish, WA

Built 1984 Load: 29.0 t ADT: 72

SOUTH MACHIAS RD

Good

Over: LITTLE PILCHUCK CREEK

3.0 S JCT SR92, Snohomish, WA

Built 2005 Load: 29.0 t ADT: 5,776

Riverside Road

Good

Over: Riverside Rd, BNSF RR

0.1 NE Jct E. Marine View, Snohomish, WA

Built 1998 Load: 29.2 t ADT: 1,000

I-405

Good

Over: 9TH AVE SE

0.4 N JCT SR 527, Snohomish, WA

Built 1968 Load: 29.9 t ADT: 45,734

144th Street SE

Good

Over: Penny Creek

0.35 mi W of 35th Ave SE, Snohomish, WA

Built 1994 Load: 30.5 t ADT: 925

I-5

Good

Over: PILCHUCK CREEK

2.0 N JCT SR 530, Snohomish, WA

Built 1973 Load: 30.8 t ADT: 39,983

363 AVE SE

Good

Over: WALLACE RIVER

0.1 S JCT SR 2, Snohomish, WA

Built 1993 Load: 30.8 t ADT: 302

138TH PL NE

Good

Over: TRIB QUILCEDA CREEK

1.4 MI E INT I-5, Snohomish, WA

Built 1994 Load: 30.8 t ADT: 446

MOUNTAIN LOOP HWY

Good

Over: CLEAR CREEK

3.0 SE DARRINGTON, Snohomish, WA

Built 1960 Load: 30.8 t ADT: 724

SR 522

Good

Over: ELLIOTT RD

6.3 E JCT SR 9, Snohomish, WA

Built 1963 Load: 31.7 t ADT: 15,235

MOUNTAIN LOOP HWY

Good

Over: SAUK RIVER

9.0 SE DARRINGTON, Snohomish, WA

Built 1983 Load: 31.7 t ADT: 650

ACCESS ROAD A

Good

Over: WETLAND

PAINE FIELD AIRPORT, Snohomish, WA

Built 2002 Load: 31.7 t ADT: 844

RD NO. 49

Good

Over: N FORK SAUK RIVER

M.P. 7.2 RD. NO. 49, Snohomish, WA

Built 1960 Load: 31.8 t ADT: 23

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.