US Bridges

I-25 Nbl and Sbl over North Platte River

Good

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

Built
2024
1 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
450 ft
3 main spans
Daily traffic
6,857
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl and Sbl over North Platte River is a steel continuous stringer/multi-beam or girder carrying I-25 Nbl and Sbl over North Platte River in Natrona County, Wyoming. It was built in 2024, so it is 1 years old, younger than the Wyoming average of 48.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,857 vehicles a day, roughly 15% of them trucks, projected to reach 9,600 by 2043. The structure is 450 ft (137.2 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-25 Nbl and Sbl
CrossesNorth Platte River
LocationCasper Marginal
RouteInterstate 25
CountyNatrona County
StateWyoming
Coordinates42.85708, -106.32725
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length450 ft (137.2 m)
Longest span175 ft (53.3 m)
Deck width38 ft (11.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic6,857 (2024)
Projected traffic9,600 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-25 Nbl and Sbl over North Platte River built?

It was built in 2024, making it 1 years old in 2025.

What condition is I-25 Nbl and Sbl over North Platte River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does I-25 Nbl and Sbl over North Platte River carry?

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

How long is I-25 Nbl and Sbl over North Platte River?

The structure is 450 ft (137.2 m) long with a longest span of 175 ft (53.3 m) and a deck 38 ft wide.

Who owns I-25 Nbl and Sbl over North Platte River?

It is owned by the State Highway Agency.