US Bridges

I 84 Wbl over Raft River

Fair

Cassia County, Idaho · 10.1 N. Sublett · Structure no. 000000000016455

Built
1967
58 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
52 ft
1 main span
Daily traffic
5,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over Raft River is a concrete tee beam carrying I 84 Wbl over Raft River in Cassia County, Idaho. It was built in 1967, so it is 58 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,750 vehicles a day, roughly 49% of them trucks, projected to reach 8,625 by 2042. The structure is 52 ft (15.8 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI 84 Wbl
CrossesRaft River
Location10.1 N. Sublett
RouteInterstate 84
StateIdaho
Coordinates42.43674, -113.34426
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span50 ft (15.2 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,750 (2023)
Projected traffic8,625 by 2042
Trucks49%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 84 Wbl over Raft River built?

It was built in 1967, making it 58 years old in 2025.

What condition is I 84 Wbl over Raft River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does I 84 Wbl over Raft River carry?

About 5,750 vehicles per day (2023 count), of which roughly 49% are trucks.

How long is I 84 Wbl over Raft River?

The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 41 ft wide.

Who owns I 84 Wbl over Raft River?

It is owned by the State Highway Agency.