US Bridges

Dehart Trail over Int Dehart I 90 007

Good

Sweet Grass County, Montana · 7M SW Big Timber · Structure no. L49122000+00201

Built
1981
44 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
296 ft
4 main spans
Daily traffic
100
2025 count
Owner
State
State Highway Agency

About this bridge

Dehart Trail over Int Dehart I 90 007 is a prestressed concrete stringer/multi-beam or girder carrying Dehart Trail over Int Dehart I 90 007 in Sweet Grass County, Montana. It was built in 1981, so it is 44 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 296 ft (90.2 m) long and 32 ft wide.

CarriesDehart Trail
CrossesInt Dehart I 90 007
Location7M SW Big Timber
RouteState Highway 49122
StateMontana
Coordinates45.77813, -110.06627
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.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating34 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length296 ft (90.2 m)
Longest span96 ft (29.4 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Dehart Trail over Int Dehart I 90 007 built?

It was built in 1981, making it 44 years old in 2025.

What condition is Dehart Trail over Int Dehart I 90 007 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 December 2024.

How much traffic does Dehart Trail over Int Dehart I 90 007 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Dehart Trail over Int Dehart I 90 007?

The structure is 296 ft (90.2 m) long with a longest span of 96 ft (29.4 m) and a deck 32 ft wide.

Who owns Dehart Trail over Int Dehart I 90 007?

It is owned by the State Highway Agency.