US Bridges

Number 4 RD over Mussleshell River 011

Good

Musselshell County, Montana · 1M E Roundup · Structure no. L33045000+04001

Built
1995
30 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
169 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Number 4 RD over Mussleshell River 011 is a prestressed concrete tee beam carrying Number 4 RD over Mussleshell River 011 in Musselshell County, Montana. It was built in 1995, so it is 30 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 169 ft (51.5 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNumber 4 RD
CrossesMussleshell River 011
Location1M E Roundup
RouteCounty Highway 33129
StateMontana
Coordinates46.44646, -108.51256
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 inspectionSeptember 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 alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length169 ft (51.5 m)
Longest span84 ft (25.6 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 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 closed3.7 mi (6 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 Number 4 RD over Mussleshell River 011 built?

It was built in 1995, making it 30 years old in 2025.

What condition is Number 4 RD over Mussleshell River 011 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 Number 4 RD over Mussleshell River 011 carry?

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

How long is Number 4 RD over Mussleshell River 011?

The structure is 169 ft (51.5 m) long with a longest span of 84 ft (25.6 m) and a deck 26 ft wide.

Who owns Number 4 RD over Mussleshell River 011?

It is owned by the County Highway Agency.