US Bridges

I-25 Nbl over Westwinds Road

Fair

Natrona County, Wyoming · Casper Marginal · Structure no. AIU

Built
1964
61 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
88 ft
3 main spans
Daily traffic
3,544
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over Westwinds Road is a concrete continuous slab carrying I-25 Nbl over Westwinds Road in Natrona County, Wyoming. It was built in 1964, so it is 61 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 3,544 vehicles a day, roughly 24% of them trucks, projected to reach 4,962 by 2043. The structure is 88 ft (26.8 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesI-25 Nbl
CrossesWestwinds Road
LocationCasper Marginal
RouteInterstate 25
CountyNatrona County
StateWyoming
Coordinates42.93551, -106.33397
Functional classRural Principal Arterial - Interstate

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 2023
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 alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length88 ft (26.8 m)
Longest span35 ft (10.7 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,544 (2024)
Projected traffic4,962 by 2043
Trucks24%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-25 Nbl over Westwinds Road built?

It was built in 1964, making it 61 years old in 2025.

What condition is I-25 Nbl over Westwinds Road 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 I-25 Nbl over Westwinds Road carry?

About 3,544 vehicles per day (2024 count), of which roughly 24% are trucks.

How long is I-25 Nbl over Westwinds Road?

The structure is 88 ft (26.8 m) long with a longest span of 35 ft (10.7 m) and a deck 42 ft wide.

Who owns I-25 Nbl over Westwinds Road?

It is owned by the State Highway Agency.