I-5 over Steamboat Slough

Fair Condition58 years old64,989 vehicles/day

Location

StateWashington
CountySnohomish
Location4.1 N Jct US 2
CarriesI-5
CrossesSteamboat Slough
Coordinates48.03496, -122.17808

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure6 (Satisfactory)
Substructure6 (Satisfactory)
Channel/Waterway6 (Satisfactory)
Scour Critical7 — Countermeasures installed

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignStringer/Multi-beam
Total Length1025.9 ft (312.7 m)
Max Span121.1 ft (36.9 m)
Deck Width51.5 ft (15.7 m)
Deck Area4909.4 sq m
Main Spans9
Year Built1968

Traffic

Avg Daily Traffic64,989 (2023)
Truck Traffic6%
Lanes On Bridge3

Inspection & Ownership

Last Inspection324
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0008226E0000000

Nearby Bridges

I-5 over Steamboat Slough 0.0 mi Fair SR 529 over Steamboat Slough 0.2 mi Fair SR 529 over Steamboat Slough 0.2 mi Poor I-5 over SR 529 NB Ramp 0.4 mi Fair I-5 over SR 529 NB Ramp 0.4 mi Fair SR 529 over Union Sl 0.4 mi Poor SR 529 over Union Sl 0.4 mi Poor I-5 over Sr529 Rr Ebey Sl 60th Pl 0.6 mi Fair I-5 over Ebey Sl / SR 529 / Rr 0.6 mi Fair SR 529 over Ebey Slough 0.7 mi Good