US Bridges

US 20 over Casper Creek

Fair

Natrona County, Wyoming · Casper · Structure no. DDF

Built
1977
48 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
148 ft
3 main spans
Daily traffic
11,584
2024 count
Owner
State
State Highway Agency

About this bridge

US 20 over Casper Creek is a steel continuous stringer/multi-beam or girder carrying US 20 over Casper Creek in Natrona County, Wyoming. It was built in 1977, so it is 48 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 11,584 vehicles a day, roughly 4% of them trucks, projected to reach 16,218 by 2043. The structure is 148 ft (45.1 m) long and 87 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 20
CrossesCasper Creek
LocationCasper
RouteU.S. Route 20
CountyNatrona County
StateWyoming
Coordinates42.84613, -106.36283
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating63.1 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length148 ft (45.1 m)
Longest span56 ft (17.1 m)
Deck width87 ft (26.6 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,584 (2024)
Projected traffic16,218 by 2043
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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$33,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 over Casper Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is US 20 over Casper 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 April 2024.

How much traffic does US 20 over Casper Creek carry?

About 11,584 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is US 20 over Casper Creek?

The structure is 148 ft (45.1 m) long with a longest span of 56 ft (17.1 m) and a deck 87 ft wide.

Who owns US 20 over Casper Creek?

It is owned by the State Highway Agency.