US Bridges

Sublett Road over I 84 Eb-Wb;sublett RD Ic

Fair

Cassia County, Idaho · At Sublett · Structure no. 000000000024255

Built
1967
58 years old, rebuilt 1981
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
312 ft
5 main spans
Daily traffic
300
2023 count
Owner
State
State Highway Agency

About this bridge

Sublett Road over I 84 Eb-Wb;sublett RD Ic is a prestressed concrete stringer/multi-beam or girder carrying Sublett Road over I 84 Eb-Wb;sublett RD Ic in Cassia County, Idaho. It was built in 1967 and reconstructed in 1981, 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 5 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 300 vehicles a day, projected to reach 450 by 2042. The structure is 312 ft (95.1 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesSublett Road
CrossesI 84 Eb-Wb;sublett RD Ic
LocationAt Sublett
RouteCounty Highway 0
CountyCassia County
StateIdaho
Coordinates42.32775, -113.21358
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length312 ft (95.1 m)
Longest span69 ft (21 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic450 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.9 million (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sublett Road over I 84 Eb-Wb;sublett RD Ic built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1981.

What condition is Sublett Road over I 84 Eb-Wb;sublett RD Ic 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 April 2023.

How much traffic does Sublett Road over I 84 Eb-Wb;sublett RD Ic carry?

About 300 vehicles per day (2023 count).

How long is Sublett Road over I 84 Eb-Wb;sublett RD Ic?

The structure is 312 ft (95.1 m) long with a longest span of 69 ft (21 m) and a deck 33 ft wide.

Who owns Sublett Road over I 84 Eb-Wb;sublett RD Ic?

It is owned by the State Highway Agency.