US Bridges

I-25 Nbl over Wyo 259

Fair

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

Built
1976
49 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
138 ft
3 main spans
Daily traffic
1,656
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over Wyo 259 is a concrete continuous tee beam carrying I-25 Nbl over Wyo 259 in Natrona County, Wyoming. It was built in 1976, so it is 49 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 5 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 1,656 vehicles a day, roughly 31% of them trucks, projected to reach 2,318 by 2043. The structure is 138 ft (42.1 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesI-25 Nbl
CrossesWyo 259
LocationCasper - Kaycee
RouteInterstate 25
CountyNatrona County
StateWyoming
Coordinates43.16816, -106.33885
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.7 US tons
Inventory rating34.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length138 ft (42.1 m)
Longest span56 ft (17.1 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,656 (2024)
Projected traffic2,318 by 2043
Trucks31%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Nbl over Wyo 259 built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-25 Nbl over Wyo 259 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 Wyo 259 carry?

About 1,656 vehicles per day (2024 count), of which roughly 31% are trucks.

How long is I-25 Nbl over Wyo 259?

The structure is 138 ft (42.1 m) long with a longest span of 56 ft (17.1 m) and a deck 45 ft wide.

Who owns I-25 Nbl over Wyo 259?

It is owned by the State Highway Agency.