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)

Sort:

BROADWAY AVE

Over: I-5 TO SR 526 RAMP

2.8 N JCT SR 96, Snohomish, WA

Built 1970 ADT: 19,797

BROADWAY

Over: SR 526 E-S RAMP

JCT I-5 & SR 527, Snohomish, WA

Built 1970 ADT: 14,690

I-5

Over: SR 528 4TH ST

JCT I-5, Snohomish, WA

Built 1971 ADT: 25,693

SR 522

Over: US 2 & BN RR

8.3 E JCT SR 9, Snohomish, WA

Built 1971 ADT: 28,656

I-5

Over: SR 532 / 268TH ST NE

7.2 E SNOHOMISH CO, Snohomish, WA

Built 1971 ADT: 12,622

TULALIP RR

Over: I-5

3.2 N JCT SR 528, Snohomish, WA

Built 1971 ADT: 98,781

5TH AVE

Over: SR 104 WB

1.0 E JCT SR 524, Snohomish, WA

Built 1971 ADT: 5,358

236TH ST NE

Over: I-5

1.6 N JCT SR 530, Snohomish, WA

Built 1975 ADT: 79,965

SR 99

Over: SR 104

3.3 E JCT SR 524, Snohomish, WA

Built 1975 ADT: 22,067

SR 9

Over: US 2

2.6 E JCT SR 204, Snohomish, WA

Built 1979 ADT: 17,044

164TH ST SW

Over: I-5

1.3 N JCT I-405, Snohomish, WA

Built 1963 ADT: 154,119

I-405

Over: SR 524 (FILBERT RD)

1.5 E JCT I-5, Snohomish, WA

Built 1968 ADT: 21,475

I-405

Over: SR 524 (FILBERT RD)

1.5 E JCT I-5, Snohomish, WA

Built 1968 ADT: 21,475

I-5

Over: S 405 & N 525 RAMPS

1.4 N JCT SR 524, Snohomish, WA

Built 1980 ADT: 25,480

MAPLE ROAD

Over: I-5

0.3 N JCT I-405, Snohomish, WA

Built 1962 ADT: 134,243

164TH ST SW

Over: SR 525

1.4 N JCT I-5, Snohomish, WA

Built 1980 ADT: 56,760

148TH ST SW

Over: SR 525

2.4 N JCT I-5, Snohomish, WA

Built 1980 ADT: 56,760

I-405

Over: I-5

1.4 N JCT SR 524, Snohomish, WA

Built 1981 ADT: 134,243

I-405 NB TO I-5 SB

Over: RAMPS AND SWAMP CREEK

1.4 N JCT SR 524, Snohomish, WA

Built 1981 ADT: 15,523

I-405

Over: I-5

1.4 N JCT SR 524, Snohomish, WA

Built 1982 ADT: 134,243

THREE LAKES RD

Over: US 2

2.1 E JCT SR 9, Snohomish, WA

Built 1983 ADT: 22,670

88TH ST SE

Over: US 2

3.3 E JCT SR 9, Snohomish, WA

Built 1983 ADT: 19,400

220TH ST SW

Over: I-5

1.5 N JCT SR 104, Snohomish, WA

Built 1963 ADT: 159,714

SR 527

Over: I-5

2.8 N JCT SR 96, Snohomish, WA

Built 1987 ADT: 122,990

SR 96(128TH ST SW)

Over: I-5

3.8 N JCT I-405, Snohomish, WA

Built 1987 ADT: 144,746

US 2 RAMP

Over: US 2 WB, SR 204, RAMPS

JCT US 2, Snohomish, WA

Built 1993 ADT: 7,066

US 2 RAMP

Over: US 2 WB, SR 204

JCT US 2, Snohomish, WA

Built 1993 ADT: 7,066

I-5 RAMP

Over: NBCD

3.0 N JCT SR 523, Snohomish, WA

Built 1995 ADT: 12,344

S-S RAMP

Over: S-E RAMP

3.2 N JCT SR 523, Snohomish, WA

Built 1995 ADT: 11,927

SR 526 E-N RAMP

Over: I-5 BROADWAY AVE

JCT I-5 & SR 527, Snohomish, WA

Built 1995 ADT: 34,151

88TH ST NE

Over: I-5

1.6 N JCT SR 528, Snohomish, WA

Built 1996 ADT: 110,463

SR 9

Over: SR 522

0.6 E KING CO, Snohomish, WA

Built 1997 ADT: 29,880

SR 525

Over: SR 99

3.8 N JCT SR 524, Snohomish, WA

Built 2001 ADT: 37,579

RAMP

Over: SB I-5

2.9 N JCT SR 104, Snohomish, WA

Built 2004 ADT: 81,547

I-5 HOV LANES

Over: SR 524 SPUR/44TH AVE W

0.5 E JCT SR 524, Snohomish, WA

Built 2004 ADT: 26,181

SR 531

Over: I-5

7.0 N JCT SR 528, Snohomish, WA

Built 2005 ADT: 74,462

ASH WAY ACCESS

Over: I-5 SB

1.5 N JCT I-405, Snohomish, WA

Built 2005 ADT: 77,060

N-N RAMP

Over: I-5

3.1 N JCT SR 527, Snohomish, WA

Built 2006 ADT: 186,520

I-5 SB

Over: NB & SB HOV RAMPS

3.8 N JCT SR 527, Snohomish, WA

Built 2007 ADT: 2,017

41ST ST NE

Over: I-5

4.1 N JCT SR 527, Snohomish, WA

Built 2006 ADT: 153,336

PEDESTRIAN

Over: I-5

0.3 N JCT SR 96, Snohomish, WA

Built 2006 ADT: 144,746

CANYON PARK PED

Over: I-405

1.6 N KING CO, Snohomish, WA

Built 2007 ADT: 91,468

112TH ST SE

Over: I-5 SB

1.3 N JCT SR 96, Snohomish, WA

Built 2007 ADT: 82,582

112TH ST SE

Over: I-5 NB

1.3 N JCT SR 96, Snohomish, WA

Built 2007 ADT: 82,582

SOUND TRANSIT PED

Over: I-5 NB

0.6 N JCT SR 104, Snohomish, WA

Built 2010 ADT: 77,874

N-W RAMP(BICKFORD)

Over: US 2

1.3 N JCT SR 204, Snohomish, WA

Built 2013 ADT: 37,043

ALDERWOOD M BLVD

Over: SR 524 E-S, I-5 S-E

JCT SR 524, Snohomish, WA

Built 1999 ADT: 6,637

ALDERWOOD MALL BLV

Over: SR 524/196TH ST SW

1.6 E JCT SR 99, Snohomish, WA

Built 1999 ADT: 39,428

PEDESTRIAN

Over: I-5 S-W RAMP

JCT SR 524, Snohomish, WA

Built 2010 ADT: 14,897

116TH ST NE

Over: I-5

3.3 N JCT SR 528, Snohomish, WA

Built 2016 ADT: 98,781

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