US Bridges

IRR - S 314 over Rosebud Creek

Fair

Big Horn County, Montana · 11M SW Busby · Structure no. S00314033+08871

Built
1983
42 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
75 ft
1 main span
Daily traffic
388
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 314 over Rosebud Creek is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 314 over Rosebud Creek in Big Horn County, Montana. It was built in 1983, so it is 42 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 388 vehicles a day, roughly 6% of them trucks, projected to reach 407 by 2043. The structure is 75 ft (22.9 m) long and 30 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesIRR - S 314
CrossesRosebud Creek
Location11M SW Busby
RouteState Highway 314
CountyBig Horn County
StateMontana
Coordinates45.38493, -106.99407
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span75 ft (22.9 m)
Deck width30 ft (9.2 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic388 (2023)
Projected traffic407 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 314 over Rosebud Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is IRR - S 314 over Rosebud Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does IRR - S 314 over Rosebud Creek carry?

About 388 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is IRR - S 314 over Rosebud Creek?

The structure is 75 ft (22.9 m) long with a longest span of 75 ft (22.9 m) and a deck 30 ft wide.

Who owns IRR - S 314 over Rosebud Creek?

It is owned by the State Highway Agency.