I-5 over Stillaguamish R

Fair Condition55 years old45,626 vehicles/day

Location

StateWashington
CountySnohomish
Location0.7 N Jct SR 530
CarriesI-5
CrossesStillaguamish R
Coordinates48.19642, -122.20947

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure5 (Fair)
Substructure6 (Satisfactory)
Channel/Waterway6 (Satisfactory)
Scour Critical3 — Scour critical

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length661.1 ft (201.5 m)
Max Span203.1 ft (61.9 m)
Deck Width55.1 ft (16.8 m)
Deck Area3385.2 sq m
Main Spans4
Year Built1971

Traffic

Avg Daily Traffic45,626 (2023)
Truck Traffic8%
Lanes On Bridge3
Lanes Under Bridge2

Inspection & Ownership

Last Inspection423
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0008791A0000000

Nearby Bridges

I-5 over Stillaguamish River 0.1 mi Fair SR 530 over I-5 0.7 mi Good 236th ST NE over I-5 1.0 mi Fair 236th ST NE over Unnamed Stream 1.0 mi Good Pioneer Highway over Thomsen Slough 1.1 mi Fair Smokey Point BLVD over South Slough 1.1 mi Fair Hevly RD over Stillaguamish Slough 1.2 mi Fair 236 ST NE over Pilchuck Creek 1.2 mi Fair Old 99 over Pilchuck Creek 1.3 mi Poor 212 TH ST NE over Portage Creek 1.3 mi Good