US Bridges

I-25 Nbl over North Platte River

Fair

Converse County, Wyoming · Douglas Marginal · Structure no. AFZ

Built
1966
59 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
464 ft
4 main spans
Daily traffic
3,723
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over North Platte River is a steel continuous stringer/multi-beam or girder carrying I-25 Nbl over North Platte River in Converse County, Wyoming. It was built in 1966, so it is 59 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 3,723 vehicles a day, roughly 28% of them trucks, projected to reach 5,212 by 2043. The structure is 464 ft (141.4 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-25 Nbl
CrossesNorth Platte River
LocationDouglas Marginal
RouteInterstate 25
CountyConverse County
StateWyoming
Coordinates42.74157, -105.39936
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.7 US tons
Inventory rating32.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length464 ft (141.4 m)
Longest span130 ft (39.6 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic3,723 (2024)
Projected traffic5,212 by 2043
Trucks28%
Lanes on structure2
Traffic directionOne-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 statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1966, making it 59 years old in 2025.

What condition is I-25 Nbl over North Platte River 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 North Platte River carry?

About 3,723 vehicles per day (2024 count), of which roughly 28% are trucks.

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

The structure is 464 ft (141.4 m) long with a longest span of 130 ft (39.6 m) and a deck 34 ft wide.

Who owns I-25 Nbl over North Platte River?

It is owned by the State Highway Agency.