US Bridges

US 287 over Granite Creek

Good

Madison County, Montana · 3M NW Virgnia City · Structure no. 000000202305715

Built
2023
2 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
1,433
2023 count
Owner
State
State Highway Agency

About this bridge

US 287 over Granite Creek is a prestressed concrete stringer/multi-beam or girder carrying US 287 over Granite Creek in Madison County, Montana. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,433 vehicles a day, roughly 5% of them trucks, projected to reach 1,505 by 2043. The structure is 71 ft (21.7 m) long and 43 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 287
CrossesGranite Creek
Location3M NW Virgnia City
RouteState Highway 287
StateMontana
Coordinates45.32453, -112.0012
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating48.6 US tons
Inventory rating29.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length71 ft (21.7 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,433 (2023)
Projected traffic1,505 by 2043
Trucks5%
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

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 287 over Granite Creek built?

It was built in 2023, making it 2 years old in 2025.

What condition is US 287 over Granite 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 May 2024.

How much traffic does US 287 over Granite Creek carry?

About 1,433 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 287 over Granite Creek?

The structure is 71 ft (21.7 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns US 287 over Granite Creek?

It is owned by the State Highway Agency.