US Bridges

US 212 FH 59 over West Fork Rock Creek

Good

Carbon County, Montana · 1M S Red Lodge · Structure no. P00028067+02131

Built
1980
45 years old
Condition
Good
inspected October 2024
Type
Tee Beam
Concrete Continuous
Length
99 ft
3 main spans
Daily traffic
1,142
2023 count
Owner
State
State Highway Agency

About this bridge

US 212 FH 59 over West Fork Rock Creek is a concrete continuous tee beam carrying US 212 FH 59 over West Fork Rock Creek in Carbon County, Montana. It was built in 1980, so it is 45 years old, younger 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 1,142 vehicles a day, projected to reach 1,199 by 2043. The structure is 99 ft (30.2 m) long and 46 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 212 FH 59
CrossesWest Fork Rock Creek
Location1M S Red Lodge
RouteU.S. Route 212
StateMontana
Coordinates45.15763, -109.2688
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating47 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length99 ft (30.2 m)
Longest span68 ft (20.7 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,142 (2023)
Projected traffic1,199 by 2043
Trucks0%
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 West Fork Rock Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is US 212 FH 59 over West Fork 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 October 2024.

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

About 1,142 vehicles per day (2023 count).

How long is US 212 FH 59 over West Fork Rock Creek?

The structure is 99 ft (30.2 m) long with a longest span of 68 ft (20.7 m) and a deck 46 ft wide.

Who owns US 212 FH 59 over West Fork Rock Creek?

It is owned by the State Highway Agency.