US Bridges

Flathead Pass RD over Flathead Creek

Good

Gallatin County, Montana · 5M W Sedan · Structure no. 000000000007068

Built
2017
8 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
77
2023 count
Owner
County
County Highway Agency

About this bridge

Flathead Pass RD over Flathead Creek is a steel stringer/multi-beam or girder carrying Flathead Pass RD over Flathead Creek in Gallatin County, Montana. It was built in 2017, so it is 8 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 77 vehicles a day, roughly 3% of them trucks, projected to reach 82 by 2043. The structure is 25 ft (7.6 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesFlathead Pass RD
CrossesFlathead Creek
Location5M W Sedan
RouteCounty Highway 16124
StateMontana
Coordinates45.96749, -110.93576
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 inspectionJune 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 alignment6: Equal to present minimum criteria
Operating rating42 US tons
Inventory rating33 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span24 ft (7.4 m)
Deck width25 ft (7.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77 (2023)
Projected traffic82 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 Flathead Pass RD over Flathead Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is Flathead Pass RD over Flathead Creek 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 June 2024.

How much traffic does Flathead Pass RD over Flathead Creek carry?

About 77 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Flathead Pass RD over Flathead Creek?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.4 m) and a deck 25 ft wide.

Who owns Flathead Pass RD over Flathead Creek?

It is owned by the County Highway Agency.