I-90 over Mercer Slough

Fair Condition56 years old3,203 vehicles/day

Location

StateWashington
CountyKing
Location6.8 E Jct I-5
CarriesI-90
CrossesMercer Slough
Coordinates47.57878, -122.18628

Condition Ratings

Overall ConditionFair
Deck7 (Good)
Superstructure6 (Satisfactory)
Substructure7 (Good)
Channel/Waterway8 (Very Good)
Scour Critical8 — Stable, low risk

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length970.1 ft (295.7 m)
Max Span84.0 ft (25.6 m)
Deck Width25.6 ft (7.8 m)
Deck Area2306.5 sq m
Main Spans8
Year Built1970

Traffic

Avg Daily Traffic3,203 (2010)
Truck Traffic5%
Lanes On Bridge1

Inspection & Ownership

Last Inspection223
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0008610F0000000

Nearby Bridges

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