US Bridges

US 20/26 Conn. Wbl over BNSF / Casper Creek

Fair

Natrona County, Wyoming · Casper · Structure no. CDI

Built
1961
64 years old, rebuilt 2016
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
418 ft
5 main spans
Daily traffic
4,929
2024 count
Owner
State
State Highway Agency

About this bridge

US 20/26 Conn. Wbl over BNSF / Casper Creek is a steel continuous stringer/multi-beam or girder carrying US 20/26 Conn. Wbl over BNSF / Casper Creek in Natrona County, Wyoming. It was built in 1961 and reconstructed in 2016, so it is 64 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 4,929 vehicles a day, roughly 17% of them trucks, projected to reach 6,901 by 2043. The structure is 418 ft (127.4 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20/26 Conn. Wbl
CrossesBNSF / Casper Creek
LocationCasper
RouteU.S. Route 20
CountyNatrona County
StateWyoming
Coordinates42.8627, -106.38292
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
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length418 ft (127.4 m)
Longest span89 ft (27.1 m)
Deck width40 ft (12.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,929 (2024)
Projected traffic6,901 by 2043
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20/26 Conn. Wbl over BNSF / Casper Creek built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2016.

What condition is US 20/26 Conn. Wbl over BNSF / 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 2023.

How much traffic does US 20/26 Conn. Wbl over BNSF / Casper Creek carry?

About 4,929 vehicles per day (2024 count), of which roughly 17% are trucks.

How long is US 20/26 Conn. Wbl over BNSF / Casper Creek?

The structure is 418 ft (127.4 m) long with a longest span of 89 ft (27.1 m) and a deck 40 ft wide.

Who owns US 20/26 Conn. Wbl over BNSF / Casper Creek?

It is owned by the State Highway Agency.