US Bridges

I-25 Nbl over Wyo 220

Fair

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

Built
1985
40 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
185 ft
2 main spans
Daily traffic
6,857
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over Wyo 220 is a steel continuous stringer/multi-beam or girder carrying I-25 Nbl over Wyo 220 in Natrona County, Wyoming. It was built in 1985, so it is 40 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 6,857 vehicles a day, roughly 15% of them trucks, projected to reach 9,600 by 2043. The structure is 185 ft (56.4 m) long and 53 ft wide.

Location

Open in Google Maps
CarriesI-25 Nbl
CrossesWyo 220
LocationCasper Marginal
RouteInterstate 25
CountyNatrona County
StateWyoming
Coordinates42.85751, -106.3332
Functional classUrban 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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length185 ft (56.4 m)
Longest span93 ft (28.3 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,857 (2024)
Projected traffic9,600 by 2043
Trucks15%
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Nbl over Wyo 220 built?

It was built in 1985, making it 40 years old in 2025.

What condition is I-25 Nbl over Wyo 220 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 June 2024.

How much traffic does I-25 Nbl over Wyo 220 carry?

About 6,857 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is I-25 Nbl over Wyo 220?

The structure is 185 ft (56.4 m) long with a longest span of 93 ft (28.3 m) and a deck 53 ft wide.

Who owns I-25 Nbl over Wyo 220?

It is owned by the State Highway Agency.