US Bridges

I 84 Wbl over Co.Rd.;gs NO.4

Fair

Cassia County, Idaho · 15.8 E. Sublett · Structure no. 000000000016515

Built
1968
57 years old
Condition
Fair
inspected May 2023
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
5,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over Co.Rd.;gs NO.4 is a concrete frame carrying I 84 Wbl over Co.Rd.;gs NO.4 in Cassia County, Idaho. It was built in 1968, so it is 57 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 5,500 vehicles a day, roughly 48% of them trucks, projected to reach 8,250 by 2042. The structure is 24 ft (7.3 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 84 Wbl
CrossesCo.Rd.;gs NO.4
Location15.8 E. Sublett
RouteInterstate 84
CountyCassia County
StateIdaho
Coordinates42.17461, -113.00564
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.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating46 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width58 ft (17.7 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2023)
Projected traffic8,250 by 2042
Trucks48%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 84 Wbl over Co.Rd.;gs NO.4 built?

It was built in 1968, making it 57 years old in 2025.

What condition is I 84 Wbl over Co.Rd.;gs NO.4 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 2023.

How much traffic does I 84 Wbl over Co.Rd.;gs NO.4 carry?

About 5,500 vehicles per day (2023 count), of which roughly 48% are trucks.

How long is I 84 Wbl over Co.Rd.;gs NO.4?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 58 ft wide.

Who owns I 84 Wbl over Co.Rd.;gs NO.4?

It is owned by the State Highway Agency.