US Bridges

Wyo 120 over Sage Creek

Fair

Park County, Wyoming · Thermopolis - Cody · Structure no. CAY

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
3 main spans
Daily traffic
2,675
2024 count
Owner
State
State Highway Agency

About this bridge

Wyo 120 over Sage Creek is a steel continuous stringer/multi-beam or girder carrying Wyo 120 over Sage Creek in Park County, Wyoming. It was built in 1970, so it is 55 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 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 2,675 vehicles a day, roughly 9% of them trucks, projected to reach 3,745 by 2043. The structure is 174 ft (53 m) long and 39 ft wide. If it were closed, the detour would be 80.2 mi (129 km).

Location

Open in Google Maps
CarriesWyo 120
CrossesSage Creek
LocationThermopolis - Cody
RouteState Highway 120
CountyPark County
StateWyoming
Coordinates44.40042, -108.9979
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length174 ft (53 m)
Longest span68 ft (20.7 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,675 (2024)
Projected traffic3,745 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed80.2 mi (129 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost$6,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Wyo 120 over Sage Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Wyo 120 over Sage 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 Sage Creek carry?

About 2,675 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Wyo 120 over Sage Creek?

The structure is 174 ft (53 m) long with a longest span of 68 ft (20.7 m) and a deck 39 ft wide.

Who owns Wyo 120 over Sage Creek?

It is owned by the State Highway Agency.