US Bridges

I 15 Nbl over Gibson Canal

Fair

Bingham County, Idaho · 5.5 S. Blackfoot · Structure no. 000000000011415

Built
1959
66 years old
Condition
Fair
inspected February 2025
Type
Frame
Concrete
Length
21 ft
1 main span
Daily traffic
13,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over Gibson Canal is a concrete frame carrying I 15 Nbl over Gibson Canal in Bingham 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 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 13,750 vehicles a day, roughly 17% of them trucks, projected to reach 20,625 by 2042. The structure is 21 ft (6.4 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesGibson Canal
Location5.5 S. Blackfoot
RouteInterstate 15
CountyBingham County
StateIdaho
Coordinates43.12403, -112.38831
Functional classRural 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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width48 ft (14.7 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,750 (2023)
Projected traffic20,625 by 2042
Trucks17%
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 Gibson Canal built?

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

What condition is I 15 Nbl over Gibson Canal 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 February 2025.

How much traffic does I 15 Nbl over Gibson Canal carry?

About 13,750 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I 15 Nbl over Gibson Canal?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 48 ft wide.

Who owns I 15 Nbl over Gibson Canal?

It is owned by the State Highway Agency.