US Bridges

IRR BIA RTE 2 over Box Elder Creek

Fair

Hill County, Montana · 1.3 KM N Rocky Boys Agcy · Structure no. 00000000000C916

Built
1992
33 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
1,400
2024 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 2 over Box Elder Creek is a concrete culvert carrying IRR BIA RTE 2 over Box Elder Creek in Hill County, Montana. It was built in 1992, so it is 33 years old, younger than the Montana average of 47 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 1,400 vehicles a day, roughly 10% of them trucks, projected to reach 1,638 by 2044. The structure is 21 ft (6.4 m) long and 37 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesIRR BIA RTE 2
CrossesBox Elder Creek
Location1.3 KM N Rocky Boys Agcy
RouteFederal Lands Road 2
StateMontana
Coordinates48.26661, -109.79225
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width37 ft (11.2 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2024)
Projected traffic1,638 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
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 IRR BIA RTE 2 over Box Elder Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is IRR BIA RTE 2 over Box Elder Creek 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 October 2024.

How much traffic does IRR BIA RTE 2 over Box Elder Creek carry?

About 1,400 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is IRR BIA RTE 2 over Box Elder Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 37 ft wide.

Who owns IRR BIA RTE 2 over Box Elder Creek?

It is owned by the Bureau of Indian Affairs.