US Bridges

Las Vegas Loop over RR 059

FairPosted for load

Chouteau County, Montana · 3M W Fort Benton · Structure no. L08104000+01001

Built
1938
87 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
90 ft
5 main spans
Daily traffic
100
2025 count
Owner
Railroad
Railroad

About this bridge

Las Vegas Loop over RR 059 is a wood or timber stringer/multi-beam or girder carrying Las Vegas Loop over RR 059 in Chouteau County, Montana. It was built in 1938, so it is 87 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 90 ft (27.4 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesLas Vegas Loop
CrossesRR 059
Location3M W Fort Benton
RouteCounty Highway 8104
CountyChouteau County
StateMontana
Coordinates47.81424, -110.72138
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating23 US tons
Inventory rating17 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadUnknown
Structure length90 ft (27.4 m)
Longest span21 ft (6.3 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byRailroad
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$318,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Las Vegas Loop over RR 059 built?

It was built in 1938, making it 87 years old in 2025.

What condition is Las Vegas Loop over RR 059 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 December 2024.

How much traffic does Las Vegas Loop over RR 059 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Las Vegas Loop over RR 059?

The structure is 90 ft (27.4 m) long with a longest span of 21 ft (6.3 m) and a deck 22 ft wide.

Who owns Las Vegas Loop over RR 059?

It is owned by the Railroad.