US Bridges

Cb Route RD over Buffalo Rapids CANAL042

FairPosted for load

Prairie County, Montana · 5M NE Fallon · Structure no. L40108003+00001

Built
1939
86 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
39 ft
2 main spans
Daily traffic
80
2023 count
Owner
County
County Highway Agency

About this bridge

Cb Route RD over Buffalo Rapids CANAL042 is a wood or timber stringer/multi-beam or girder carrying Cb Route RD over Buffalo Rapids CANAL042 in Prairie County, Montana. It was built in 1939, so it is 86 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. Its operating status is: posted for load restriction.

It carries about 80 vehicles a day, roughly 3% of them trucks, projected to reach 84 by 2043. The structure is 39 ft (11.9 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCb Route RD
CrossesBuffalo Rapids CANAL042
Location5M NE Fallon
RouteCounty Highway 40108
CountyPrairie County
StateMontana
Coordinates46.87345, -105.05305
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.
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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length39 ft (11.9 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (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 statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$74,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Cb Route RD over Buffalo Rapids CANAL042 built?

It was built in 1939, making it 86 years old in 2025.

What condition is Cb Route RD over Buffalo Rapids CANAL042 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 November 2024.

How much traffic does Cb Route RD over Buffalo Rapids CANAL042 carry?

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

How long is Cb Route RD over Buffalo Rapids CANAL042?

The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Cb Route RD over Buffalo Rapids CANAL042?

It is owned by the County Highway Agency.