I-90 over Mercer Slough

Fair Condition56 years old31,000 vehicles/day

Location

StateWashington
CountyKing
Location6.4 E Jct I-5
CarriesI-90
CrossesMercer Slough
Coordinates47.57914, -122.18619

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure5 (Fair)
Substructure6 (Satisfactory)
Channel/Waterway8 (Very Good)
Scour Critical8 — Stable, low risk

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length1723.1 ft (525.2 m)
Max Span42.0 ft (12.8 m)
Deck Width51.5 ft (15.7 m)
Deck Area8245.6 sq m
Main Spans42
Year Built1970 (reconstructed 1993)

Traffic

Avg Daily Traffic31,000 (2013)
Truck Traffic5%
Lanes On Bridge3
Lanes Under Bridge2

Inspection & Ownership

Last Inspection223
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0008610C0000000

Nearby Bridges

I-90 over Mercer Slough 0.0 mi Fair I-90 over Mercer Slough 0.0 mi Fair I-90 W-n Ramp over I-90 Wbcd 0.1 mi Fair I-90 S-e Ramp over I-90 Mercer Slough 0.1 mi Fair I-90 over Mercer Sl 0.2 mi Poor I-90 over Mercer Slough 0.2 mi Poor E-e Ramp over I-90 Ramps Mercer Sl 0.3 mi Good I-90 Ramp over Mercer Slough I-90 0.4 mi Good Skagit Key over Coal Creek 0.5 mi Good Newport Key over Coal Creek 0.5 mi Good