US Bridges

Tierney Loop DR over Musselshell River 008

Good

Wheatland County, Montana · 4M E Harlowton · Structure no. L54021000+06001

Built
1988
37 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
147 ft
3 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Tierney Loop DR over Musselshell River 008 is a steel continuous stringer/multi-beam or girder carrying Tierney Loop DR over Musselshell River 008 in Wheatland 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 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 147 ft (44.8 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesTierney Loop DR
CrossesMusselshell River 008
Location4M E Harlowton
RouteCounty Highway 54010
StateMontana
Coordinates46.41389, -109.73983
Functional classRural Local

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 inspectionSeptember 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length147 ft (44.8 m)
Longest span57 ft (17.4 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Tierney Loop DR over Musselshell River 008 built?

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

What condition is Tierney Loop DR over Musselshell River 008 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 September 2024.

How much traffic does Tierney Loop DR over Musselshell River 008 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Tierney Loop DR over Musselshell River 008?

The structure is 147 ft (44.8 m) long with a longest span of 57 ft (17.4 m) and a deck 27 ft wide.

Who owns Tierney Loop DR over Musselshell River 008?

It is owned by the County Highway Agency.