US Bridges

Black Diamond RD over Beaver Creek 011

Fair

Wibaux County, Montana · 6M SE Wibaux · Structure no. 000000000004742

Built
2017
8 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
85 ft
1 main span
Daily traffic
46
2023 count
Owner
County
County Highway Agency

About this bridge

Black Diamond RD over Beaver Creek 011 is a prestressed concrete stringer/multi-beam or girder carrying Black Diamond RD over Beaver Creek 011 in Wibaux County, Montana. It was built in 2017, so it is 8 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 46 vehicles a day, roughly 3% of them trucks, projected to reach 49 by 2043. The structure is 85 ft (25.9 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesBlack Diamond RD
CrossesBeaver Creek 011
Location6M SE Wibaux
RouteCounty Highway 55201
CountyWibaux County
StateMontana
Coordinates46.91833, -104.16889
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length85 ft (25.9 m)
Longest span83 ft (25.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic46 (2023)
Projected traffic49 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Black Diamond RD over Beaver Creek 011 built?

It was built in 2017, making it 8 years old in 2025.

What condition is Black Diamond RD over Beaver Creek 011 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 August 2023.

How much traffic does Black Diamond RD over Beaver Creek 011 carry?

About 46 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Black Diamond RD over Beaver Creek 011?

The structure is 85 ft (25.9 m) long with a longest span of 83 ft (25.3 m) and a deck 30 ft wide.

Who owns Black Diamond RD over Beaver Creek 011?

It is owned by the County Highway Agency.