US Bridges

Back Loop RD over Little Bighorn River 023

Good

Big Horn County, Montana · 1M N Wyola · Structure no. L02266000+04001

Built
1986
39 years old
Condition
Good
inspected February 2024
Type
Tee Beam
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Back Loop RD over Little Bighorn River 023 is a prestressed concrete tee beam carrying Back Loop RD over Little Bighorn River 023 in Big Horn County, Montana. It was built in 1986, so it is 39 years old, younger than the Montana average of 47 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 87 ft (26.5 m) long and 26 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesBack Loop RD
CrossesLittle Bighorn River 023
Location1M N Wyola
RouteCounty Highway 2266
StateMontana
Coordinates45.13929, -107.39587
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.1 US tons
Inventory rating33 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span85 ft (25.9 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Back Loop RD over Little Bighorn River 023 built?

It was built in 1986, making it 39 years old in 2025.

What condition is Back Loop RD over Little Bighorn River 023 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 February 2024.

How much traffic does Back Loop RD over Little Bighorn River 023 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Back Loop RD over Little Bighorn River 023?

The structure is 87 ft (26.5 m) long with a longest span of 85 ft (25.9 m) and a deck 26 ft wide.

Who owns Back Loop RD over Little Bighorn River 023?

It is owned by the County Highway Agency.