US Bridges

I 94 over Coal Creek

Fair

Custer County, Montana · 7M SW Miles City · Structure no. I00094131+08821

Built
1963
62 years old, rebuilt 1974
Condition
Fair
inspected July 2023
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
4,724
2023 count
Owner
State
State Highway Agency

About this bridge

I 94 over Coal Creek is a steel culvert carrying I 94 over Coal Creek in Custer County, Montana. It was built in 1963 and reconstructed in 1974, so it is 62 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 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 4,724 vehicles a day, roughly 23% of them trucks, projected to reach 5,102 by 2043. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesI 94
CrossesCoal Creek
Location7M SW Miles City
RouteInterstate 94
StateMontana
Coordinates46.34498, -105.93662
Functional classRural Principal Arterial - Interstate

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.3 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 traffic4,724 (2023)
Projected traffic5,102 by 2043
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 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 I 94 over Coal Creek built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1974.

What condition is I 94 over Coal 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 July 2023.

How much traffic does I 94 over Coal Creek carry?

About 4,724 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I 94 over Coal Creek?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m).

Who owns I 94 over Coal Creek?

It is owned by the State Highway Agency.