US Bridges

Theony RD over Rock Creek 031

Fair

Valley County, Montana · 23M W Opheim · Structure no. L53001020+07001

Built
2013
12 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
219 ft
2 main spans
Daily traffic
14
2023 count
Owner
County
County Highway Agency

About this bridge

Theony RD over Rock Creek 031 is a prestressed concrete tee beam carrying Theony RD over Rock Creek 031 in Valley County, Montana. It was built in 2013, so it is 12 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 14 vehicles a day, roughly 3% of them trucks, projected to reach 15 by 2043. The structure is 219 ft (66.8 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesTheony RD
CrossesRock Creek 031
Location23M W Opheim
RouteCounty Highway 53201
CountyValley County
StateMontana
Coordinates48.88022, -106.90106
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60 US tons
Inventory rating45 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length219 ft (66.8 m)
Longest span109 ft (33.3 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14 (2023)
Projected traffic15 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$510,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Theony RD over Rock Creek 031 built?

It was built in 2013, making it 12 years old in 2025.

What condition is Theony RD over Rock Creek 031 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 2024.

How much traffic does Theony RD over Rock Creek 031 carry?

About 14 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Theony RD over Rock Creek 031?

The structure is 219 ft (66.8 m) long with a longest span of 109 ft (33.3 m) and a deck 27 ft wide.

Who owns Theony RD over Rock Creek 031?

It is owned by the County Highway Agency.