US Bridges

US 2 over Libby Creek

Fair

Lincoln County, Montana · 11M S Libby · Structure no. P00001044+07961

Built
1988
37 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
122 ft
1 main span
Daily traffic
1,642
2023 count
Owner
State
State Highway Agency

About this bridge

US 2 over Libby Creek is a prestressed concrete stringer/multi-beam or girder carrying US 2 over Libby Creek in Lincoln County, Montana. It was built in 1988, so it is 37 years old, younger 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 1,642 vehicles a day, roughly 6% of them trucks, projected to reach 1,773 by 2043. The structure is 122 ft (37.2 m) long and 42 ft wide. If it were closed, the detour would be 119.9 mi (193 km).

CarriesUS 2
CrossesLibby Creek
Location11M S Libby
RouteU.S. Route 2
StateMontana
Coordinates48.22499, -115.47725
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating34 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span120 ft (36.6 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,642 (2023)
Projected traffic1,773 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed119.9 mi (193 km)
TollOn a free road
National Highway SystemYes

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 US 2 over Libby Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is US 2 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 September 2024.

How much traffic does US 2 over Libby Creek carry?

About 1,642 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 2 over Libby Creek?

The structure is 122 ft (37.2 m) long with a longest span of 120 ft (36.6 m) and a deck 42 ft wide.

Who owns US 2 over Libby Creek?

It is owned by the State Highway Agency.