US Bridges

Byam RD over Clarks Fk YELLOWSTONE024

Good

Yellowstone County, Montana · 3M S Laurel · Structure no. L56303000+08001

Built
1997
28 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
411 ft
3 main spans
Daily traffic
290
2023 count
Owner
County
County Highway Agency

About this bridge

Byam RD over Clarks Fk YELLOWSTONE024 is a prestressed concrete stringer/multi-beam or girder carrying Byam RD over Clarks Fk YELLOWSTONE024 in Yellowstone County, Montana. It was built in 1997, so it is 28 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 290 vehicles a day, roughly 3% of them trucks, projected to reach 306 by 2043. The structure is 411 ft (125.2 m) long and 26 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesByam RD
CrossesClarks Fk YELLOWSTONE024
Location3M S Laurel
RouteCounty Highway 56303
CountyYellowstone County
StateMontana
Coordinates45.62483, -108.76493
Functional classRural Minor Collector

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; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length411 ft (125.2 m)
Longest span136 ft (41.6 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2023)
Projected traffic306 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Byam RD over Clarks Fk YELLOWSTONE024 built?

It was built in 1997, making it 28 years old in 2025.

What condition is Byam RD over Clarks Fk YELLOWSTONE024 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 Byam RD over Clarks Fk YELLOWSTONE024 carry?

About 290 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Byam RD over Clarks Fk YELLOWSTONE024?

The structure is 411 ft (125.2 m) long with a longest span of 136 ft (41.6 m) and a deck 26 ft wide.

Who owns Byam RD over Clarks Fk YELLOWSTONE024?

It is owned by the County Highway Agency.