US Bridges

I 15 Nbl over I 15B;S.POCATELLO Ic

Fair

Bannock County, Idaho · 2.6 S. Pocatello · Structure no. 000000000011225

Built
1965
60 years old
Condition
Fair
inspected September 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
281 ft
4 main spans
Daily traffic
10,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over I 15B;S.POCATELLO Ic is a prestressed concrete stringer/multi-beam or girder carrying I 15 Nbl over I 15B;S.POCATELLO Ic in Bannock County, Idaho. It was built in 1965, so it is 60 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 10,000 vehicles a day, roughly 20% of them trucks, projected to reach 15,000 by 2042. The structure is 281 ft (85.6 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesI 15B;S.POCATELLO Ic
Location2.6 S. Pocatello
RouteInterstate 15
CountyBannock County
StateIdaho
Coordinates42.83933, -112.41044
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length281 ft (85.6 m)
Longest span73 ft (22.3 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2023)
Projected traffic15,000 by 2042
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.2 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 Nbl over I 15B;S.POCATELLO Ic built?

It was built in 1965, making it 60 years old in 2025.

What condition is I 15 Nbl over I 15B;S.POCATELLO 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 September 2021.

How much traffic does I 15 Nbl over I 15B;S.POCATELLO Ic carry?

About 10,000 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 15 Nbl over I 15B;S.POCATELLO Ic?

The structure is 281 ft (85.6 m) long with a longest span of 73 ft (22.3 m) and a deck 33 ft wide.

Who owns I 15 Nbl over I 15B;S.POCATELLO Ic?

It is owned by the State Highway Agency.