US Bridges

Shepherd Acton RD over Bbwa Canal 086

Fair

Yellowstone County, Montana · 4M W Shepherd · Structure no. L56751002+01001

Built
1984
41 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Shepherd Acton RD over Bbwa Canal 086 is a prestressed concrete tee beam carrying Shepherd Acton RD over Bbwa Canal 086 in Yellowstone County, Montana. It was built in 1984, so it is 41 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 57 ft (17.4 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesShepherd Acton RD
CrossesBbwa Canal 086
Location4M W Shepherd
RouteCounty Highway 56751
StateMontana
Coordinates45.94358, -108.42494
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span53 ft (16.2 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9.1 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 closed11.8 mi (19 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 Shepherd Acton RD over Bbwa Canal 086 built?

It was built in 1984, making it 41 years old in 2025.

What condition is Shepherd Acton RD over Bbwa Canal 086 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 October 2024.

How much traffic does Shepherd Acton RD over Bbwa Canal 086 carry?

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

How long is Shepherd Acton RD over Bbwa Canal 086?

The structure is 57 ft (17.4 m) long with a longest span of 53 ft (16.2 m) and a deck 32 ft wide.

Who owns Shepherd Acton RD over Bbwa Canal 086?

It is owned by the County Highway Agency.