US Bridges

US-12 over Whetstone Creek

Good

Meagher County, Montana · 5M E Checkerboard · Structure no. P00014067+09901

Built
2012
13 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
128 ft
1 main span
Daily traffic
347
2023 count
Owner
State
State Highway Agency

About this bridge

US-12 over Whetstone Creek is a prestressed concrete stringer/multi-beam or girder carrying US-12 over Whetstone Creek in Meagher County, Montana. It was built in 2012, so it is 13 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 347 vehicles a day, roughly 6% of them trucks, projected to reach 364 by 2043. The structure is 128 ft (39.1 m) long and 35 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

CarriesUS-12
CrossesWhetstone Creek
Location5M E Checkerboard
RouteU.S. Route 12
StateMontana
Coordinates46.543, -110.45018
Functional classRural Minor Arterial

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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating41 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length128 ft (39.1 m)
Longest span127 ft (38.7 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic347 (2023)
Projected traffic364 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US-12 over Whetstone Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is US-12 over Whetstone 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 November 2024.

How much traffic does US-12 over Whetstone Creek carry?

About 347 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US-12 over Whetstone Creek?

The structure is 128 ft (39.1 m) long with a longest span of 127 ft (38.7 m) and a deck 35 ft wide.

Who owns US-12 over Whetstone Creek?

It is owned by the State Highway Agency.