US Bridges

W 6th ST over Flower Creek 004

Fair

Lincoln County, Montana · W Edge Libby · Structure no. M27072000+00201

Built
1968
57 years old
Condition
Fair
inspected October 2024
Type
Channel Beam
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
1,733
2023 count
Owner
County
County Highway Agency

About this bridge

W 6th ST over Flower Creek 004 is a prestressed concrete channel beam carrying W 6th ST over Flower Creek 004 in Lincoln County, Montana. It was built in 1968, so it is 57 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 1,733 vehicles a day, roughly 3% of them trucks, projected to reach 1,846 by 2043. The structure is 33 ft (10.1 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesW 6th ST
CrossesFlower Creek 004
LocationW Edge Libby
RouteCity Street 27072
StateMontana
Coordinates48.39228, -115.55984
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating36 US tons
Inventory rating36 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span32 ft (9.8 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,733 (2023)
Projected traffic1,846 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 W 6th ST over Flower Creek 004 built?

It was built in 1968, making it 57 years old in 2025.

What condition is W 6th ST over Flower Creek 004 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 W 6th ST over Flower Creek 004 carry?

About 1,733 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is W 6th ST over Flower Creek 004?

The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 24 ft wide.

Who owns W 6th ST over Flower Creek 004?

It is owned by the County Highway Agency.