US Bridges

I-5 over Blakeslee JCT RR

Good

Lewis County, Washington · 1.6 N JCT SR 507 · Structure no. 0018473A0000000

Built
2015
10 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
329 ft
2 main spans
Daily traffic
34,754
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Blakeslee JCT RR is a prestressed concrete continuous stringer/multi-beam or girder carrying I-5 over Blakeslee JCT RR in Lewis County, Washington. It was built in 2015, so it is 10 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 34,754 vehicles a day, roughly 17% of them trucks, projected to reach 44,679 by 2039. The structure is 329 ft (100.3 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5
CrossesBlakeslee JCT RR
Location1.6 N JCT SR 507
RouteInterstate 5
CountyLewis County
StateWashington
Coordinates46.7349, -122.97504
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length329 ft (100.3 m)
Longest span162 ft (49.4 m)
Deck width62 ft (18.9 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,754 (2023)
Projected traffic44,679 by 2039
Trucks17%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$9.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Blakeslee JCT RR built?

It was built in 2015, making it 10 years old in 2025.

What condition is I-5 over Blakeslee JCT RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does I-5 over Blakeslee JCT RR carry?

About 34,754 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I-5 over Blakeslee JCT RR?

The structure is 329 ft (100.3 m) long with a longest span of 162 ft (49.4 m) and a deck 62 ft wide.

Who owns I-5 over Blakeslee JCT RR?

It is owned by the State Highway Agency.