US Bridges

I-25 Sbl over Machinery Pass

Fair

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

Built
1974
51 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
3,379
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over Machinery Pass is a concrete continuous tee beam carrying I-25 Sbl over Machinery Pass in Platte County, Wyoming. It was built in 1974, so it is 51 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 3,379 vehicles a day, roughly 26% of them trucks, projected to reach 4,731 by 2043. The structure is 75 ft (22.9 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-25 Sbl
CrossesMachinery Pass
LocationWheatland - Glendo
RouteInterstate 25
CountyPlatte County
StateWyoming
Coordinates42.46675, -105.02794
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 rating49.3 US tons
Inventory rating29.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length75 ft (22.9 m)
Longest span31 ft (9.4 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,379 (2024)
Projected traffic4,731 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Sbl over Machinery Pass built?

It was built in 1974, making it 51 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 March 2023.

How much traffic does I-25 Sbl over Machinery Pass carry?

About 3,379 vehicles per day (2024 count), of which roughly 26% are trucks.

How long is I-25 Sbl over Machinery Pass?

The structure is 75 ft (22.9 m) long with a longest span of 31 ft (9.4 m) and a deck 45 ft wide.

Who owns I-25 Sbl over Machinery Pass?

It is owned by the State Highway Agency.