US Bridges

I-25 Sbl over Machinery Pass

Fair

Platte County, Wyoming · Wheatland - Glendo · Structure no. ADU

Built
1966
59 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
188 ft
3 main spans
Daily traffic
3,568
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over Machinery Pass is a steel stringer/multi-beam or girder carrying I-25 Sbl over Machinery Pass in Platte 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 5 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 3,568 vehicles a day, roughly 26% of them trucks, projected to reach 4,995 by 2043. The structure is 188 ft (57.2 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-25 Sbl
CrossesMachinery Pass
LocationWheatland - Glendo
RouteInterstate 25
CountyPlatte County
StateWyoming
Coordinates42.08142, -104.97265
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.8 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length188 ft (57.2 m)
Longest span68 ft (20.7 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,568 (2024)
Projected traffic4,995 by 2043
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$338,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Sbl over Machinery Pass built?

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

What condition is I-25 Sbl over Machinery Pass 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 Sbl over Machinery Pass carry?

About 3,568 vehicles per day (2024 count), of which roughly 26% are trucks.

How long is I-25 Sbl over Machinery Pass?

The structure is 188 ft (57.2 m) long with a longest span of 68 ft (20.7 m) and a deck 33 ft wide.

Who owns I-25 Sbl over Machinery Pass?

It is owned by the State Highway Agency.