US Bridges

Wyo 120 over Cottonwood Creek

Fair

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

Built
1989
36 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
1,342
2024 count
Owner
State
State Highway Agency

About this bridge

Wyo 120 over Cottonwood Creek is a prestressed concrete stringer/multi-beam or girder carrying Wyo 120 over Cottonwood Creek in Park County, Wyoming. It was built in 1989, so it is 36 years old, younger 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 6 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 1,342 vehicles a day, roughly 11% of them trucks, projected to reach 1,879 by 2043. The structure is 87 ft (26.5 m) long and 43 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesWyo 120
CrossesCottonwood Creek
LocationCody-Montana State Line
RouteState Highway 120
CountyPark County
StateWyoming
Coordinates44.5833, -109.11432
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span84 ft (25.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,342 (2024)
Projected traffic1,879 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 Wyo 120 over Cottonwood Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is Wyo 120 over Cottonwood Creek 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 July 2023.

How much traffic does Wyo 120 over Cottonwood Creek carry?

About 1,342 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Wyo 120 over Cottonwood Creek?

The structure is 87 ft (26.5 m) long with a longest span of 84 ft (25.6 m) and a deck 43 ft wide.

Who owns Wyo 120 over Cottonwood Creek?

It is owned by the State Highway Agency.