US Bridges

S 255 over O`brien Coulee

Good

Hill County, Montana · 9M N Rudyard · Structure no. S00255008+09001

Built
1992
33 years old
Condition
Good
inspected March 2024
Type
Culvert
Steel
Length
35 ft
2 main spans
Daily traffic
88
2023 count
Owner
State
State Highway Agency

About this bridge

S 255 over O`brien Coulee is a steel culvert carrying S 255 over O`brien Coulee in Hill County, Montana. It was built in 1992, so it is 33 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 10% of them trucks, projected to reach 101 by 2043. The structure is 35 ft (10.6 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesS 255
CrossesO`brien Coulee
Location9M N Rudyard
RouteState Highway 255
CountyHill County
StateMontana
Coordinates48.68235, -110.55408
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHL 93
Structure length35 ft (10.6 m)
Longest span16 ft (4.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88 (2023)
Projected traffic101 by 2043
Trucks10%
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 S 255 over O`brien Coulee built?

It was built in 1992, making it 33 years old in 2025.

What condition is S 255 over O`brien Coulee 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 March 2024.

How much traffic does S 255 over O`brien Coulee carry?

About 88 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is S 255 over O`brien Coulee?

The structure is 35 ft (10.6 m) long with a longest span of 16 ft (4.8 m).

Who owns S 255 over O`brien Coulee?

It is owned by the State Highway Agency.