Snohomish County, WA

516 public highway bridges

Snohomish County Bridge Snapshot

Snohomish County, Washington contains 516 public highway bridges in the FHWA National Bridge Inventory. Roughly 37.8% are rated “Good,” 37.8% “Fair,” 3.7% “Poor,” and 3.7% 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.

516
Total Bridges
37.8%
Good
3.7%
Poor
3.7%
Structurally Deficient

Condition Distribution

Good
37.8% (195)
Fair
37.8% (195)
Poor
3.7% (19)
SD
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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial