US Bridges

I 15 Nbl over Snake River;blackfoot Br

Fair

Bingham County, Idaho · 1.9 N. Blackfoot · Structure no. 000000000011486

Built
2003
22 years old
Condition
Fair
inspected September 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
831 ft
7 main spans
Daily traffic
13,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over Snake River;blackfoot Br is a prestressed concrete continuous stringer/multi-beam or girder carrying I 15 Nbl over Snake River;blackfoot Br in Bingham County, Idaho. It was built in 2003, so it is 22 years old, younger 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 13,000 vehicles a day, roughly 19% of them trucks, projected to reach 19,500 by 2042. The structure is 831 ft (253.3 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesSnake River;blackfoot Br
Location1.9 N. Blackfoot
RouteInterstate 15
CountyBingham County
StateIdaho
Coordinates43.22108, -112.34389
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.9 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 25 or greater
Structure length831 ft (253.3 m)
Longest span118 ft (36 m)
Deck width56 ft (17.2 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2023)
Projected traffic19,500 by 2042
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15 Nbl over Snake River;blackfoot Br built?

It was built in 2003, making it 22 years old in 2025.

What condition is I 15 Nbl over Snake River;blackfoot Br 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 2022.

How much traffic does I 15 Nbl over Snake River;blackfoot Br carry?

About 13,000 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is I 15 Nbl over Snake River;blackfoot Br?

The structure is 831 ft (253.3 m) long with a longest span of 118 ft (36 m) and a deck 56 ft wide.

Who owns I 15 Nbl over Snake River;blackfoot Br?

It is owned by the State Highway Agency.