US Bridges

I-25 Nbl over Machinery Pass

Fair

Converse County, Wyoming · Glendo - Douglas · Structure no. CZW

Built
1971
54 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
180 ft
3 main spans
Daily traffic
3,563
2024 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl over Machinery Pass is a steel continuous stringer/multi-beam or girder carrying I-25 Nbl over Machinery Pass in Converse County, Wyoming. It was built in 1971, so it is 54 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 3,563 vehicles a day, roughly 24% of them trucks, projected to reach 4,988 by 2043. The structure is 180 ft (54.9 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 Nbl
CrossesMachinery Pass
LocationGlendo - Douglas
RouteInterstate 25
CountyConverse County
StateWyoming
Coordinates42.65297, -105.1988
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length180 ft (54.9 m)
Longest span68 ft (20.7 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,563 (2024)
Projected traffic4,988 by 2043
Trucks24%
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 Nbl over Machinery Pass built?

It was built in 1971, making it 54 years old in 2025.

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

About 3,563 vehicles per day (2024 count), of which roughly 24% are trucks.

How long is I-25 Nbl over Machinery Pass?

The structure is 180 ft (54.9 m) long with a longest span of 68 ft (20.7 m) and a deck 45 ft wide.

Who owns I-25 Nbl over Machinery Pass?

It is owned by the State Highway Agency.