US Bridges

IRR - S 251 over Drainage

Good

Roosevelt County, Montana · 25 North East of Popular · Structure no. 000000202306495

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete
Length
28 ft
1 main span
Daily traffic
88
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 251 over Drainage is a concrete culvert carrying IRR - S 251 over Drainage in Roosevelt 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 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 88 vehicles a day, roughly 18% of them trucks, projected to reach 92 by 2043. The structure is 28 ft (8.5 m) long and 52 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesIRR - S 251
CrossesDrainage
Location25 North East of Popular
RouteState Highway 251
CountyRoosevelt County
StateMontana
Coordinates48.40347, -105.08339
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating56.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width52 ft (15.8 m)
Roadway width0 ft (0 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic88 (2023)
Projected traffic92 by 2043
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 IRR - S 251 over Drainage built?

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

What condition is IRR - S 251 over Drainage 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 2023.

How much traffic does IRR - S 251 over Drainage carry?

About 88 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is IRR - S 251 over Drainage?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 52 ft wide.

Who owns IRR - S 251 over Drainage?

It is owned by the State Highway Agency.