US Bridges

I-25 Nbl over Wyo 312 (south Street)

Fair

Platte County, Wyoming · Wheatland Marginal · Structure no. BRH

Built
1975
50 years old
Condition
Fair
inspected April 2023
Type
Frame
Steel Continuous
Length
146 ft
3 main spans
Daily traffic
3,657
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over Wyo 312 (south Street) is a steel continuous frame carrying I-25 Nbl over Wyo 312 (south Street) in Platte County, Wyoming. It was built in 1975, so it is 50 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 3,657 vehicles a day, roughly 30% of them trucks, projected to reach 5,120 by 2043. The structure is 146 ft (44.5 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-25 Nbl
CrossesWyo 312 (south Street)
LocationWheatland Marginal
RouteInterstate 25
CountyPlatte County
StateWyoming
Coordinates42.05139, -104.96535
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeFrame
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length146 ft (44.5 m)
Longest span56 ft (17.1 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,657 (2024)
Projected traffic5,120 by 2043
Trucks30%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Nbl over Wyo 312 (south Street) built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-25 Nbl over Wyo 312 (south Street) 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 312 (south Street) carry?

About 3,657 vehicles per day (2024 count), of which roughly 30% are trucks.

How long is I-25 Nbl over Wyo 312 (south Street)?

The structure is 146 ft (44.5 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 312 (south Street)?

It is owned by the State Highway Agency.