US Bridges

S Musselshell RD over Musselshell River

Good

Musselshell County, Montana · Musselshell · Structure no. S00310040+01921

Built
1960
65 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
193 ft
3 main spans
Daily traffic
157
2023 count
Owner
State
State Highway Agency

About this bridge

S Musselshell RD over Musselshell River is a prestressed concrete stringer/multi-beam or girder carrying S Musselshell RD over Musselshell River in Musselshell County, Montana. It was built in 1960, so it is 65 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 157 vehicles a day, roughly 8% of them trucks, projected to reach 165 by 2043. The structure is 193 ft (58.8 m) long and 27 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesS Musselshell RD
CrossesMusselshell River
LocationMusselshell
RouteState Highway 310
StateMontana
Coordinates46.52027, -108.09161
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating32 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length193 ft (58.8 m)
Longest span72 ft (21.9 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic157 (2023)
Projected traffic165 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 S Musselshell RD over Musselshell River built?

It was built in 1960, making it 65 years old in 2025.

What condition is S Musselshell RD over Musselshell River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does S Musselshell RD over Musselshell River carry?

About 157 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is S Musselshell RD over Musselshell River?

The structure is 193 ft (58.8 m) long with a longest span of 72 ft (21.9 m) and a deck 27 ft wide.

Who owns S Musselshell RD over Musselshell River?

It is owned by the State Highway Agency.