US Bridges

I-25 Nbl over Swanson Road

Fair

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

Built
1975
50 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
160 ft
3 main spans
Daily traffic
3,657
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over Swanson Road is a concrete continuous tee beam carrying I-25 Nbl over Swanson Road 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 160 ft (48.8 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesI-25 Nbl
CrossesSwanson Road
LocationWheatland Marginal
RouteInterstate 25
CountyPlatte County
StateWyoming
Coordinates42.07418, -104.96644
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.1 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length160 ft (48.8 m)
Longest span65 ft (19.7 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
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 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 Swanson Road built?

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

What condition is I-25 Nbl over Swanson Road 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 January 2025.

How much traffic does I-25 Nbl over Swanson Road carry?

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

How long is I-25 Nbl over Swanson Road?

The structure is 160 ft (48.8 m) long with a longest span of 65 ft (19.7 m) and a deck 45 ft wide.

Who owns I-25 Nbl over Swanson Road?

It is owned by the State Highway Agency.