US Bridges

Farm to Market RD over Libby Creek

Fair

Lincoln County, Montana · 5M S Libby · Structure no. S00482002+06021

Built
1962
63 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
124 ft
2 main spans
Daily traffic
999
2023 count
Owner
State
State Highway Agency

About this bridge

Farm to Market RD over Libby Creek is a prestressed concrete stringer/multi-beam or girder carrying Farm to Market RD over Libby Creek in Lincoln County, Montana. It was built in 1962, so it is 63 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 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 999 vehicles a day, roughly 2% of them trucks, projected to reach 1,049 by 2043. The structure is 124 ft (37.7 m) long and 27 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesFarm to Market RD
CrossesLibby Creek
Location5M S Libby
RouteState Highway 482
CountyLincoln County
StateMontana
Coordinates48.31439, -115.50472
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length124 ft (37.7 m)
Longest span61 ft (18.5 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic999 (2023)
Projected traffic1,049 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Farm to Market RD over Libby Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Farm to Market RD over Libby Creek 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 Farm to Market RD over Libby Creek carry?

About 999 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Farm to Market RD over Libby Creek?

The structure is 124 ft (37.7 m) long with a longest span of 61 ft (18.5 m) and a deck 27 ft wide.

Who owns Farm to Market RD over Libby Creek?

It is owned by the State Highway Agency.