US Bridges

US 20/26 Conn. Wbl over Na County Road 129

Fair

Natrona County, Wyoming · Casper · Structure no. CDG

Built
1960
65 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
4,929
2024 count
Owner
State
State Highway Agency

About this bridge

US 20/26 Conn. Wbl over Na County Road 129 is a concrete continuous slab carrying US 20/26 Conn. Wbl over Na County Road 129 in Natrona County, Wyoming. It was built in 1960, so it is 65 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 93 ft (28.3 m) long and 39 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
CrossesNa County Road 129
LocationCasper
RouteU.S. Route 20
CountyNatrona County
StateWyoming
Coordinates42.86216, -106.39802
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length93 ft (28.3 m)
Longest span35 ft (10.7 m)
Deck width39 ft (11.8 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
CrossesHighway
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 Na County Road 129 built?

It was built in 1960, making it 65 years old in 2025.

What condition is US 20/26 Conn. Wbl over Na County Road 129 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 20/26 Conn. Wbl over Na County Road 129 carry?

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

How long is US 20/26 Conn. Wbl over Na County Road 129?

The structure is 93 ft (28.3 m) long with a longest span of 35 ft (10.7 m) and a deck 39 ft wide.

Who owns US 20/26 Conn. Wbl over Na County Road 129?

It is owned by the State Highway Agency.