US Bridges

US 212 FH 59 over Rock Creek

Good

Carbon County, Montana · 8M SW Red Lodge · Structure no. P00028059+04791

Built
1965
60 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
136 ft
3 main spans
Daily traffic
721
2023 count
Owner
State
State Highway Agency

About this bridge

US 212 FH 59 over Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying US 212 FH 59 over Rock Creek in Carbon County, Montana. It was built in 1965, so it is 60 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 721 vehicles a day, roughly 1% of them trucks, projected to reach 757 by 2043. The structure is 136 ft (41.5 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 212 FH 59
CrossesRock Creek
Location8M SW Red Lodge
RouteU.S. Route 212
StateMontana
Coordinates45.08679, -109.36673
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating56 US tons
Inventory rating37 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length136 ft (41.5 m)
Longest span50 ft (15.2 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic721 (2023)
Projected traffic757 by 2043
Trucks1%
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

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 US 212 FH 59 over Rock Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is US 212 FH 59 over Rock Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.

How much traffic does US 212 FH 59 over Rock Creek carry?

About 721 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is US 212 FH 59 over Rock Creek?

The structure is 136 ft (41.5 m) long with a longest span of 50 ft (15.2 m) and a deck 35 ft wide.

Who owns US 212 FH 59 over Rock Creek?

It is owned by the State Highway Agency.