US Bridges

Moon Creek RD over Tongue River 041

Fair

Custer County, Montana · 43M SW Miles City · Structure no. L09201031+01001

Built
1988
37 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
196 ft
3 main spans
Daily traffic
36
2023 count
Owner
County
County Highway Agency

About this bridge

Moon Creek RD over Tongue River 041 is a steel continuous stringer/multi-beam or girder carrying Moon Creek RD over Tongue River 041 in Custer County, Montana. It was built in 1988, so it is 37 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 36 vehicles a day, roughly 3% of them trucks, projected to reach 38 by 2043. The structure is 196 ft (59.6 m) long and 26 ft wide. If it were closed, the detour would be 85.7 mi (138 km).

CarriesMoon Creek RD
CrossesTongue River 041
Location43M SW Miles City
RouteCounty Highway 9201
StateMontana
Coordinates45.97888, -106.0561
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating31 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length196 ft (59.6 m)
Longest span77 ft (23.5 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36 (2023)
Projected traffic38 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed85.7 mi (138 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 Moon Creek RD over Tongue River 041 built?

It was built in 1988, making it 37 years old in 2025.

What condition is Moon Creek RD over Tongue River 041 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 2024.

How much traffic does Moon Creek RD over Tongue River 041 carry?

About 36 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Moon Creek RD over Tongue River 041?

The structure is 196 ft (59.6 m) long with a longest span of 77 ft (23.5 m) and a deck 26 ft wide.

Who owns Moon Creek RD over Tongue River 041?

It is owned by the County Highway Agency.