US Bridges

Wyo 120 over Spring Creek

Fair

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

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
2,031
2024 count
Owner
State
State Highway Agency

About this bridge

Wyo 120 over Spring Creek is a concrete continuous culvert carrying Wyo 120 over Spring 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 2,031 vehicles a day, roughly 14% of them trucks, projected to reach 2,843 by 2043. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 70.8 mi (114 km).

CarriesWyo 120
CrossesSpring Creek
LocationThermopolis - Cody
RouteState Highway 120
StateWyoming
Coordinates44.16779, -108.87632
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 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 evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,031 (2024)
Projected traffic2,843 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.8 mi (114 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Wyo 120 over Spring Creek built?

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

What condition is Wyo 120 over Spring 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 Spring Creek carry?

About 2,031 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is Wyo 120 over Spring Creek?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns Wyo 120 over Spring Creek?

It is owned by the State Highway Agency.