US Bridges

I-90 Wbl over Machinery Pass

Fair

Campbell County, Wyoming · Gillette - Moorcroft · Structure no. CFW

Built
1976
49 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
3,932
2024 count
Owner
State
State Highway Agency

About this bridge

I-90 Wbl over Machinery Pass is a concrete continuous tee beam carrying I-90 Wbl over Machinery Pass in Campbell County, Wyoming. It was built in 1976, so it is 49 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 3,932 vehicles a day, roughly 15% of them trucks, projected to reach 5,505 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-90 Wbl
CrossesMachinery Pass
LocationGillette - Moorcroft
RouteInterstate 90
CountyCampbell County
StateWyoming
Coordinates44.29069, -105.34362
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
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 geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 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 traffic3,932 (2024)
Projected traffic5,505 by 2043
Trucks15%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 Wbl over Machinery Pass built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-90 Wbl 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 May 2023.

How much traffic does I-90 Wbl over Machinery Pass carry?

About 3,932 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is I-90 Wbl 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-90 Wbl over Machinery Pass?

It is owned by the State Highway Agency.