US Bridges

IRR - S 314 over Spring Creek

Fair

Big Horn County, Montana · 5M N Decker · Structure no. S00314009+03001

Built
1981
44 years old
Condition
Fair
inspected October 2023
Type
Culvert
Steel
Length
46 ft
4 main spans
Daily traffic
499
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 314 over Spring Creek is a steel culvert carrying IRR - S 314 over Spring Creek in Big Horn 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 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 499 vehicles a day, roughly 4% of them trucks, projected to reach 524 by 2043. The structure is 46 ft (14 m) long. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesIRR - S 314
CrossesSpring Creek
Location5M N Decker
RouteState Highway 314
CountyBig Horn County
StateMontana
Coordinates45.08518, -106.81941
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length46 ft (14 m)
Longest span9 ft (2.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic499 (2023)
Projected traffic524 by 2043
Trucks4%
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 Spring Creek built?

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

What condition is IRR - S 314 over Spring 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 Spring Creek carry?

About 499 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is IRR - S 314 over Spring Creek?

The structure is 46 ft (14 m) long with a longest span of 9 ft (2.6 m).

Who owns IRR - S 314 over Spring Creek?

It is owned by the State Highway Agency.