US Bridges

North Fork RD over Hay Creek 054

Good

Flathead County, Montana · 1M S Polebridge · Structure no. L15175011+08001

Built
1979
46 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
516
2023 count
Owner
County
County Highway Agency

About this bridge

North Fork RD over Hay Creek 054 is a prestressed concrete stringer/multi-beam or girder carrying North Fork RD over Hay Creek 054 in Flathead County, Montana. It was built in 1979, so it is 46 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 516 vehicles a day, roughly 3% of them trucks, projected to reach 552 by 2043. The structure is 69 ft (21 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesNorth Fork RD
CrossesHay Creek 054
Location1M S Polebridge
RouteCounty Highway 15175
StateMontana
Coordinates48.74996, -114.28936
Functional classRural Major 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 rating40.3 US tons
Inventory rating31.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length69 ft (21 m)
Longest span65 ft (19.8 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic516 (2023)
Projected traffic552 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 Hay Creek 054 built?

It was built in 1979, making it 46 years old in 2025.

What condition is North Fork RD over Hay Creek 054 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 Hay Creek 054 carry?

About 516 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is North Fork RD over Hay Creek 054?

The structure is 69 ft (21 m) long with a longest span of 65 ft (19.8 m) and a deck 34 ft wide.

Who owns North Fork RD over Hay Creek 054?

It is owned by the County Highway Agency.