US Bridges

I-25 Sbl over Sunflower Trail

Fair

Converse County, Wyoming · Douglas - Casper · Structure no. AGN

Built
1958
67 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
80 ft
3 main spans
Daily traffic
4,762
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over Sunflower Trail is a concrete continuous slab carrying I-25 Sbl over Sunflower Trail in Converse County, Wyoming. It was built in 1958, so it is 67 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 4,762 vehicles a day, roughly 19% of them trucks, projected to reach 6,667 by 2043. The structure is 80 ft (24.4 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI-25 Sbl
CrossesSunflower Trail
LocationDouglas - Casper
RouteInterstate 25
CountyConverse County
StateWyoming
Coordinates42.79366, -105.59962
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 rating79.1 US tons
Inventory rating47.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length80 ft (24.4 m)
Longest span30 ft (9.1 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,762 (2024)
Projected traffic6,667 by 2043
Trucks19%
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 Sbl over Sunflower Trail built?

It was built in 1958, making it 67 years old in 2025.

What condition is I-25 Sbl over Sunflower Trail 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 Sbl over Sunflower Trail carry?

About 4,762 vehicles per day (2024 count), of which roughly 19% are trucks.

How long is I-25 Sbl over Sunflower Trail?

The structure is 80 ft (24.4 m) long with a longest span of 30 ft (9.1 m) and a deck 41 ft wide.

Who owns I-25 Sbl over Sunflower Trail?

It is owned by the State Highway Agency.