US Bridges

Big Sheep CR RD over Big Sheep Creek 122

Fair

Beaverhead County, Montana · 5.6M SW Dell · Structure no. L01302047+00001

Built
1985
40 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
178
2023 count
Owner
County
County Highway Agency

About this bridge

Big Sheep CR RD over Big Sheep Creek 122 is a prestressed concrete tee beam carrying Big Sheep CR RD over Big Sheep Creek 122 in Beaverhead County, Montana. It was built in 1985, so it is 40 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 5 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 178 vehicles a day, roughly 3% of them trucks, projected to reach 190 by 2043. The structure is 32 ft (9.8 m) long and 20 ft wide. If it were closed, the detour would be 85.1 mi (137 km).

Location

Open in Google Maps
CarriesBig Sheep CR RD
CrossesBig Sheep Creek 122
Location5.6M SW Dell
RouteCounty Highway 1302
CountyBeaverhead County
StateMontana
Coordinates44.61592, -112.80284
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic178 (2023)
Projected traffic190 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed85.1 mi (137 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Big Sheep CR RD over Big Sheep Creek 122 built?

It was built in 1985, making it 40 years old in 2025.

What condition is Big Sheep CR RD over Big Sheep Creek 122 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 July 2024.

How much traffic does Big Sheep CR RD over Big Sheep Creek 122 carry?

About 178 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Big Sheep CR RD over Big Sheep Creek 122?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m) and a deck 20 ft wide.

Who owns Big Sheep CR RD over Big Sheep Creek 122?

It is owned by the County Highway Agency.