US Bridges

Cb Route RD over Br Main Canal 037

Fair

Prairie County, Montana · 4M NE Fallon · Structure no. L40108002+04001

Built
1966
59 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
80
2023 count
Owner
County
County Highway Agency

About this bridge

Cb Route RD over Br Main Canal 037 is a prestressed concrete tee beam carrying Cb Route RD over Br Main Canal 037 in Prairie County, Montana. It was built in 1966, so it is 59 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 5 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 80 vehicles a day, roughly 3% of them trucks, projected to reach 84 by 2043. The structure is 25 ft (7.7 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCb Route RD
CrossesBr Main Canal 037
Location4M NE Fallon
RouteCounty Highway 40108
CountyPrairie County
StateMontana
Coordinates46.8685, -105.0641
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating51.9 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length25 ft (7.7 m)
Longest span25 ft (7.7 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2023)
Projected traffic84 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Cb Route RD over Br Main Canal 037 built?

It was built in 1966, making it 59 years old in 2025.

What condition is Cb Route RD over Br Main Canal 037 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 January 2025.

How much traffic does Cb Route RD over Br Main Canal 037 carry?

About 80 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Cb Route RD over Br Main Canal 037?

The structure is 25 ft (7.7 m) long with a longest span of 25 ft (7.7 m) and a deck 24 ft wide.

Who owns Cb Route RD over Br Main Canal 037?

It is owned by the County Highway Agency.