US Bridges

I 15 Nbl over Sidehill Canal

Good

Bonneville County, Idaho · 2.7 S. Idaho Falls · Structure no. 000000000011695

Built
1962
63 years old
Condition
Good
inspected November 2024
Type
Frame
Concrete
Length
32 ft
1 main span
Daily traffic
15,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over Sidehill Canal is a concrete frame carrying I 15 Nbl over Sidehill Canal in Bonneville 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 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 15,000 vehicles a day, roughly 16% of them trucks, projected to reach 22,500 by 2042. The structure is 32 ft (9.8 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
CrossesSidehill Canal
Location2.7 S. Idaho Falls
RouteInterstate 15
CountyBonneville County
StateIdaho
Coordinates43.46681, -112.08664
Functional classRural Principal Arterial - Interstate

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.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating38 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width48 ft (14.6 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2023)
Projected traffic22,500 by 2042
Trucks16%
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 Sidehill Canal built?

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

What condition is I 15 Nbl over Sidehill Canal 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 November 2024.

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

About 15,000 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I 15 Nbl over Sidehill Canal?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m) and a deck 48 ft wide.

Who owns I 15 Nbl over Sidehill Canal?

It is owned by the State Highway Agency.