US Bridges

Chance RD over Clarks Fk Yellowstne 004

Fair

Carbon County, Montana · 8M S Belfry · Structure no. L05129000+02001

Built
2004
21 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
289 ft
3 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Chance RD over Clarks Fk Yellowstne 004 is a prestressed concrete stringer/multi-beam or girder carrying Chance RD over Clarks Fk Yellowstne 004 in Carbon County, Montana. It was built in 2004, so it is 21 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 289 ft (88 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesChance RD
CrossesClarks Fk Yellowstne 004
Location8M S Belfry
RouteCounty Highway 5128
CountyCarbon County
StateMontana
Coordinates45.02857, -109.06054
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length289 ft (88 m)
Longest span97 ft (29.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Chance RD over Clarks Fk Yellowstne 004 built?

It was built in 2004, making it 21 years old in 2025.

What condition is Chance RD over Clarks Fk Yellowstne 004 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 August 2024.

How much traffic does Chance RD over Clarks Fk Yellowstne 004 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Chance RD over Clarks Fk Yellowstne 004?

The structure is 289 ft (88 m) long with a longest span of 97 ft (29.5 m) and a deck 30 ft wide.

Who owns Chance RD over Clarks Fk Yellowstne 004?

It is owned by the County Highway Agency.