US Bridges

Ashbough Trail over Red Rock River 086

FairPosted for load

Beaverhead County, Montana · Kidd · Structure no. L01257000+04001

Built
1909
116 years old
Condition
Fair
inspected October 2024
Type
Truss - Thru
Steel
Length
64 ft
1 main span
Daily traffic
15
2023 count
Owner
County
County Highway Agency

About this bridge

Ashbough Trail over Red Rock River 086 is a steel truss - thru carrying Ashbough Trail over Red Rock River 086 in Beaverhead County, Montana. It was built in 1909, so it is 116 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 15 vehicles a day, roughly 3% of them trucks, projected to reach 16 by 2043. The structure is 64 ft (19.5 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesAshbough Trail
CrossesRed Rock River 086
LocationKidd
RouteCounty Highway 1257
CountyBeaverhead County
StateMontana
Coordinates44.80154, -112.74967
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating8 US tons
Inventory rating6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span64 ft (19.5 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2023)
Projected traffic16 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$192,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Ashbough Trail over Red Rock River 086 built?

It was built in 1909, making it 116 years old in 2025.

What condition is Ashbough Trail over Red Rock River 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 Ashbough Trail over Red Rock River 086 carry?

About 15 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Ashbough Trail over Red Rock River 086?

The structure is 64 ft (19.5 m) long with a longest span of 64 ft (19.5 m) and a deck 18 ft wide.

Who owns Ashbough Trail over Red Rock River 086?

It is owned by the County Highway Agency.