US Bridges

Bimat LN over Red Rock River 037

Good

Beaverhead County, Montana · 2M N Dell · Structure no. 000000000002184

Built
2018
7 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
55 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

Bimat LN over Red Rock River 037 is a steel stringer/multi-beam or girder carrying Bimat LN over Red Rock River 037 in Beaverhead County, Montana. It was built in 2018, so it is 7 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 30 vehicles a day, roughly 3% of them trucks, projected to reach 32 by 2043. The structure is 55 ft (16.8 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesBimat LN
CrossesRed Rock River 037
Location2M N Dell
RouteCounty Highway 1260
StateMontana
Coordinates44.75447, -112.71116
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.9 US tons
Inventory rating48 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length55 ft (16.8 m)
Longest span54 ft (16.5 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic32 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 Bimat LN over Red Rock River 037 built?

It was built in 2018, making it 7 years old in 2025.

What condition is Bimat LN over Red Rock River 037 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 October 2024.

How much traffic does Bimat LN over Red Rock River 037 carry?

About 30 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Bimat LN over Red Rock River 037?

The structure is 55 ft (16.8 m) long with a longest span of 54 ft (16.5 m) and a deck 25 ft wide.

Who owns Bimat LN over Red Rock River 037?

It is owned by the County Highway Agency.