US Bridges

2-1/2 Mile Road over Fort Hall Main Canal

Good

Bannock County, Idaho · 2.4 N 1.0 E Chubbuck · Structure no. 000000000021916

Built
2011
14 years old
Condition
Good
inspected October 2021
Type
Frame
Concrete
Length
41 ft
2 main spans
Daily traffic
500
2023 count
Owner
Local
Other Local Agency

About this bridge

2-1/2 Mile Road over Fort Hall Main Canal is a concrete frame carrying 2-1/2 Mile Road over Fort Hall Main Canal in Bannock County, Idaho. It was built in 2011, so it is 14 years old, younger 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 750 by 2039. The structure is 41 ft (12.5 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries2-1/2 Mile Road
CrossesFort Hall Main Canal
Location2.4 N 1.0 E Chubbuck
RouteCounty Highway 0
CountyBannock County
StateIdaho
Coordinates42.95611, -112.44972
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length41 ft (12.5 m)
Longest span20 ft (6.1 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic750 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local 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 2-1/2 Mile Road over Fort Hall Main Canal built?

It was built in 2011, making it 14 years old in 2025.

What condition is 2-1/2 Mile Road over Fort Hall Main 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 October 2021.

How much traffic does 2-1/2 Mile Road over Fort Hall Main Canal carry?

About 500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 2-1/2 Mile Road over Fort Hall Main Canal?

The structure is 41 ft (12.5 m) long with a longest span of 20 ft (6.1 m) and a deck 39 ft wide.

Who owns 2-1/2 Mile Road over Fort Hall Main Canal?

It is owned by the Other Local Agency.