US Bridges

Wyo 120 over Clarks Fork River

Fair

Park County, Wyoming · Cody - Montana Line · Structure no. CTH

Built
1959
66 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
364 ft
4 main spans
Daily traffic
1,657
2024 count
Owner
State
State Highway Agency

About this bridge

Wyo 120 over Clarks Fork River is a steel continuous stringer/multi-beam or girder carrying Wyo 120 over Clarks Fork River in Park County, Wyoming. It was built in 1959, so it is 66 years old, older than the Wyoming average of 48.4 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 1,657 vehicles a day, roughly 9% of them trucks, projected to reach 2,320 by 2043. The structure is 364 ft (111 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesWyo 120
CrossesClarks Fork River
LocationCody - Montana Line
RouteState Highway 120
CountyPark County
StateWyoming
Coordinates44.8882, -109.11995
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length364 ft (111 m)
Longest span100 ft (30.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,657 (2024)
Projected traffic2,320 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Wyo 120 over Clarks Fork River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Wyo 120 over Clarks Fork River 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 June 2024.

How much traffic does Wyo 120 over Clarks Fork River carry?

About 1,657 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Wyo 120 over Clarks Fork River?

The structure is 364 ft (111 m) long with a longest span of 100 ft (30.5 m) and a deck 43 ft wide.

Who owns Wyo 120 over Clarks Fork River?

It is owned by the State Highway Agency.