US Bridges

I-25 Sbl over I-25 Service Road

Fair

Natrona County, Wyoming · Casper - Kaycee · Structure no. DFN

Built
1980
45 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
164 ft
3 main spans
Daily traffic
1,647
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over I-25 Service Road is a steel continuous stringer/multi-beam or girder carrying I-25 Sbl over I-25 Service Road in Natrona County, Wyoming. It was built in 1980, so it is 45 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 1,647 vehicles a day, roughly 30% of them trucks, projected to reach 2,306 by 2043. The structure is 164 ft (50 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-25 Sbl
CrossesI-25 Service Road
LocationCasper - Kaycee
RouteInterstate 25
CountyNatrona County
StateWyoming
Coordinates43.44934, -106.38323
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.2 US tons
Inventory rating35.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length164 ft (50 m)
Longest span64 ft (19.5 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,647 (2024)
Projected traffic2,306 by 2043
Trucks30%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 I-25 Service Road built?

It was built in 1980, making it 45 years old in 2025.

What condition is I-25 Sbl over I-25 Service 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 March 2023.

How much traffic does I-25 Sbl over I-25 Service Road carry?

About 1,647 vehicles per day (2024 count), of which roughly 30% are trucks.

How long is I-25 Sbl over I-25 Service Road?

The structure is 164 ft (50 m) long with a longest span of 64 ft (19.5 m) and a deck 45 ft wide.

Who owns I-25 Sbl over I-25 Service Road?

It is owned by the State Highway Agency.