US Bridges

IRR - S 314 over Squirrel Creek

Fair

Big Horn County, Montana · Decker · Structure no. S00314002+05001

Built
1981
44 years old
Condition
Fair
inspected October 2023
Type
Culvert
Steel
Length
27 ft
2 main spans
Daily traffic
568
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 314 over Squirrel Creek is a steel culvert carrying IRR - S 314 over Squirrel 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 568 vehicles a day, roughly 4% of them trucks, projected to reach 596 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesIRR - S 314
CrossesSquirrel Creek
LocationDecker
RouteState Highway 314
CountyBig Horn County
StateMontana
Coordinates45.01269, -106.86172
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 protection8 Very GoodNo problems noted.
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 rating63.1 US tons
Inventory rating48 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic568 (2023)
Projected traffic596 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 Squirrel Creek built?

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

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

About 568 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is IRR - S 314 over Squirrel Creek?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.6 m).

Who owns IRR - S 314 over Squirrel Creek?

It is owned by the State Highway Agency.