US Bridges

E 5th ST over Libby Creek 122

Good

Lincoln County, Montana · NE Edge Libby · Structure no. L27209000+04001

Built
1985
40 years old
Condition
Good
inspected September 2024
Type
Channel Beam
Prestressed Concrete
Length
126 ft
2 main spans
Daily traffic
395
2023 count
Owner
County
County Highway Agency

About this bridge

E 5th ST over Libby Creek 122 is a prestressed concrete channel beam carrying E 5th ST over Libby Creek 122 in Lincoln County, Montana. It was built in 1985, so it is 40 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 395 vehicles a day, roughly 3% of them trucks, projected to reach 423 by 2043. The structure is 126 ft (38.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesE 5th ST
CrossesLibby Creek 122
LocationNE Edge Libby
RouteCounty Highway 27209
StateMontana
Coordinates48.38851, -115.53764
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span62 ft (18.9 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic395 (2023)
Projected traffic423 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was E 5th ST over Libby Creek 122 built?

It was built in 1985, making it 40 years old in 2025.

What condition is E 5th ST over Libby Creek 122 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does E 5th ST over Libby Creek 122 carry?

About 395 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is E 5th ST over Libby Creek 122?

The structure is 126 ft (38.4 m) long with a longest span of 62 ft (18.9 m) and a deck 28 ft wide.

Who owns E 5th ST over Libby Creek 122?

It is owned by the County Highway Agency.