US Bridges

Rock Creek Cattle over Clark Fork River 03

Fair

Powell County, Montana · 5M N Deer Lodge · Structure no. L39018007+04001

Built
1989
36 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
115 ft
3 main spans
Daily traffic
280
2023 count
Owner
County
County Highway Agency

About this bridge

Rock Creek Cattle over Clark Fork River 03 is a prestressed concrete stringer/multi-beam or girder carrying Rock Creek Cattle over Clark Fork River 03 in Powell County, Montana. It was built in 1989, so it is 36 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 280 vehicles a day, roughly 3% of them trucks, projected to reach 300 by 2043. The structure is 115 ft (34.9 m) long and 26 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesRock Creek Cattle
CrossesClark Fork River 03
Location5M N Deer Lodge
RouteCounty Highway 39028
StateMontana
Coordinates46.47306, -112.72601
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating24 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length115 ft (34.9 m)
Longest span52 ft (16 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2023)
Projected traffic300 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Rock Creek Cattle over Clark Fork River 03 built?

It was built in 1989, making it 36 years old in 2025.

What condition is Rock Creek Cattle over Clark Fork River 03 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 2023.

How much traffic does Rock Creek Cattle over Clark Fork River 03 carry?

About 280 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Rock Creek Cattle over Clark Fork River 03?

The structure is 115 ft (34.9 m) long with a longest span of 52 ft (16 m) and a deck 26 ft wide.

Who owns Rock Creek Cattle over Clark Fork River 03?

It is owned by the County Highway Agency.