US Bridges

Leslie RD over Elbow Creek 036

Fair

Carbon County, Montana · 2M SW Edgar · Structure no. L05121000+09001

Built
1913
112 years old, rebuilt 1925
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Leslie RD over Elbow Creek 036 is a steel stringer/multi-beam or girder carrying Leslie RD over Elbow Creek 036 in Carbon County, Montana. It was built in 1913 and reconstructed in 1925, so it is 112 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 26 ft (7.9 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLeslie RD
CrossesElbow Creek 036
Location2M SW Edgar
RouteCounty Highway 5114
CountyCarbon County
StateMontana
Coordinates45.44987, -108.88211
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.1 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
CrossesWaterway
Detour if closed3.7 mi (6 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$42,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Leslie RD over Elbow Creek 036 built?

It was built in 1913, making it 112 years old in 2025. It was reconstructed in 1925.

What condition is Leslie RD over Elbow Creek 036 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 May 2024.

How much traffic does Leslie RD over Elbow Creek 036 carry?

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

How long is Leslie RD over Elbow Creek 036?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 18 ft wide.

Who owns Leslie RD over Elbow Creek 036?

It is owned by the County Highway Agency.