US Bridges

Musselshell Trl RD over Yellowstone River

Fair

Yellowstone County, Montana · 1M N Custer · Structure no. S00310000+08501

Built
1964
61 years old
Condition
Fair
inspected July 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
567 ft
4 main spans
Daily traffic
265
2023 count
Owner
State
State Highway Agency

About this bridge

Musselshell Trl RD over Yellowstone River is a steel continuous girder and floorbeam system carrying Musselshell Trl RD over Yellowstone River in Yellowstone County, Montana. It was built in 1964, so it is 61 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 265 vehicles a day, roughly 10% of them trucks, projected to reach 278 by 2043. The structure is 567 ft (172.8 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesMusselshell Trl RD
CrossesYellowstone River
Location1M N Custer
RouteState Highway 310
CountyYellowstone County
StateMontana
Coordinates46.14208, -107.54919
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length567 ft (172.8 m)
Longest span156 ft (47.5 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic265 (2023)
Projected traffic278 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

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 Musselshell Trl RD over Yellowstone River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Musselshell Trl RD over Yellowstone River 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 Musselshell Trl RD over Yellowstone River carry?

About 265 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Musselshell Trl RD over Yellowstone River?

The structure is 567 ft (172.8 m) long with a longest span of 156 ft (47.5 m) and a deck 27 ft wide.

Who owns Musselshell Trl RD over Yellowstone River?

It is owned by the State Highway Agency.