I-5 over Nisqually Overflow

Fair Condition58 years old50,433 vehicles/day

Location

StateWashington
CountyThurston
Location2.7 N Jct SR 510
CarriesI-5
CrossesNisqually Overflow
Coordinates47.06911, -122.71133

Condition Ratings

Overall ConditionFair
Deck6 (Satisfactory)
Superstructure7 (Good)
Substructure7 (Good)
Channel/Waterway8 (Very Good)
Scour Critical8 — Stable, low risk

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length200.1 ft (61 m)
Max Span100.1 ft (30.5 m)
Deck Width55.4 ft (16.9 m)
Deck Area1030.9 sq m
Main Spans2
Year Built1968

Traffic

Avg Daily Traffic50,433 (2023)
Truck Traffic11%
Lanes On Bridge4

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure Number0008100J0000000

Nearby Bridges

I-5 over Nisqually Overflow-south 0.0 mi Fair Nisqually Cutoff over Overflow Channel 0.2 mi Fair I-5 S-e Ramp over I-5 Mainline 0.2 mi Fair I-5 over Nisqually River 0.3 mi Fair I-5 over Nisqually River 0.3 mi Fair I-5 over Mcallister CR 0.4 mi Good I-5 over Mcallister Creek 0.4 mi Fair I-5 over Mcallister CR 0.4 mi Fair I-5 over Mcallister CR 0.5 mi Good Martin Way E over Slough 0.6 mi Good