US Bridges

I 15 Nbl over US 26;WEST Blackfoot Ic

Fair

Bingham County, Idaho · At Blackfoot · Structure no. 000000000011475

Built
1962
63 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
157 ft
4 main spans
Daily traffic
12,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over US 26;WEST Blackfoot Ic is a concrete stringer/multi-beam or girder carrying I 15 Nbl over US 26;WEST Blackfoot Ic in Bingham County, Idaho. It was built in 1962, so it is 63 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 12,500 vehicles a day, roughly 20% of them trucks, projected to reach 18,750 by 2042. The structure is 157 ft (47.9 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesUS 26;WEST Blackfoot Ic
LocationAt Blackfoot
RouteInterstate 15
CountyBingham County
StateIdaho
Coordinates43.19847, -112.36378
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length157 ft (47.9 m)
Longest span48 ft (14.6 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,500 (2023)
Projected traffic18,750 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 Nbl over US 26;WEST Blackfoot Ic built?

It was built in 1962, making it 63 years old in 2025.

What condition is I 15 Nbl over US 26;WEST Blackfoot 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 June 2024.

How much traffic does I 15 Nbl over US 26;WEST Blackfoot Ic carry?

About 12,500 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 15 Nbl over US 26;WEST Blackfoot Ic?

The structure is 157 ft (47.9 m) long with a longest span of 48 ft (14.6 m) and a deck 40 ft wide.

Who owns I 15 Nbl over US 26;WEST Blackfoot Ic?

It is owned by the State Highway Agency.