US Bridges

I-25 Sbl over North Platte River

Good

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

Built
1966
59 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
464 ft
4 main spans
Daily traffic
4,416
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over North Platte River is a steel continuous stringer/multi-beam or girder carrying I-25 Sbl 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,416 vehicles a day, roughly 25% of them trucks, projected to reach 6,182 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).

CarriesI-25 Sbl
CrossesNorth Platte River
LocationDouglas Marginal
RouteInterstate 25
StateWyoming
Coordinates42.7414, -105.39945
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.
Superstructure7 GoodSome minor problems.
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 evaluation7: Better than 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

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 width32 ft (9.8 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic4,416 (2024)
Projected traffic6,182 by 2043
Trucks25%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

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

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

What condition is I-25 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 April 2023.

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

About 4,416 vehicles per day (2024 count), of which roughly 25% are trucks.

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

It is owned by the State Highway Agency.