US Bridges

2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs

Good

Bannock County, Idaho · 5.8 N. Pocatello · Structure no. 000000000022155

Built
1959
66 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
212 ft
3 main spans
Daily traffic
50
2023 count
Owner
State
State Highway Agency

About this bridge

2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs is a prestressed concrete stringer/multi-beam or girder carrying 2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs in Bannock County, Idaho. It was built in 1959, so it is 66 years old, older than the Idaho average of 45.3 years.

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

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2042. The structure is 212 ft (64.6 m) long and 29 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
Carries2-1/2 Mile Road
CrossesI 15;2-1/2 Mile Road Gs
Location5.8 N. Pocatello
RouteCounty Highway 0
CountyBannock County
StateIdaho
Coordinates42.95683, -112.43236
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length212 ft (64.6 m)
Longest span48 ft (14.6 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.8 mi (19 km)
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$1.8 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs built?

It was built in 1959, making it 66 years old in 2025.

What condition is 2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs 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 August 2024.

How much traffic does 2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs?

The structure is 212 ft (64.6 m) long with a longest span of 48 ft (14.6 m) and a deck 29 ft wide.

Who owns 2-1/2 Mile Road over I 15;2-1/2 Mile Road Gs?

It is owned by the State Highway Agency.