US Bridges

Battlefield Road over Deep Coulee

Fair

Big Horn County, Montana · I-90 Exit 510 East on U · Structure no. 1380001P0000000

Built
1938
87 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
150
2019 count
Owner
Federal
National Park Service

About this bridge

Battlefield Road over Deep Coulee is a concrete continuous culvert carrying Battlefield Road over Deep Coulee in Big Horn County, Montana. It was built in 1938, so it is 87 years old, older 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 5 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 150 vehicles a day, roughly 1% of them trucks, projected to reach 180 by 2039. The structure is 21 ft (6.5 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesBattlefield Road
CrossesDeep Coulee
LocationI-90 Exit 510 East on U
RouteFederal Lands Road 2100
CountyBig Horn County
StateMontana
Coordinates45.54936, -107.41619
Functional classRural Local

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length21 ft (6.5 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2019)
Projected traffic180 by 2039
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$128,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Battlefield Road over Deep Coulee built?

It was built in 1938, making it 87 years old in 2025.

What condition is Battlefield Road over Deep Coulee 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 August 2023.

How much traffic does Battlefield Road over Deep Coulee carry?

About 150 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Battlefield Road over Deep Coulee?

The structure is 21 ft (6.5 m) long with a longest span of 10 ft (3 m).

Who owns Battlefield Road over Deep Coulee?

It is owned by the National Park Service.