US Bridges

North Fork RD over Trail Creek 050

Good

Flathead County, Montana · 13M NW Polebridge · Structure no. L15175026+06001

Built
2010
15 years old
Condition
Good
inspected August 2023
Type
Channel Beam
Prestressed Concrete
Length
65 ft
1 main span
Daily traffic
73
2023 count
Owner
County
County Highway Agency

About this bridge

North Fork RD over Trail Creek 050 is a prestressed concrete channel beam carrying North Fork RD over Trail Creek 050 in Flathead County, Montana. It was built in 2010, so it is 15 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 73 vehicles a day, roughly 3% of them trucks, projected to reach 78 by 2043. The structure is 65 ft (19.8 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNorth Fork RD
CrossesTrail Creek 050
Location13M NW Polebridge
RouteCounty Highway 15175
StateMontana
Coordinates48.92095, -114.40843
Functional classRural Minor Collector

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.2 US tons
Inventory rating31.1 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length65 ft (19.8 m)
Longest span65 ft (19.8 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73 (2023)
Projected traffic78 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 North Fork RD over Trail Creek 050 built?

It was built in 2010, making it 15 years old in 2025.

What condition is North Fork RD over Trail Creek 050 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 August 2023.

How much traffic does North Fork RD over Trail Creek 050 carry?

About 73 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is North Fork RD over Trail Creek 050?

The structure is 65 ft (19.8 m) long with a longest span of 65 ft (19.8 m) and a deck 28 ft wide.

Who owns North Fork RD over Trail Creek 050?

It is owned by the County Highway Agency.