US Bridges

I-90 Wbl over Machinery Pass

FairPosted for load

Sheridan County, Wyoming · Montana Line - Sheridan · Structure no. BBE

Built
1959
66 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
68 ft
3 main spans
Daily traffic
3,925
2024 count
Owner
State
State Highway Agency

About this bridge

I-90 Wbl over Machinery Pass is a concrete continuous slab carrying I-90 Wbl over Machinery Pass in Sheridan County, Wyoming. It was built in 1959, so it is 66 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. Its operating status is: posted for load restriction.

It carries about 3,925 vehicles a day, roughly 22% of them trucks, projected to reach 5,495 by 2043. The structure is 68 ft (20.6 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-90 Wbl
CrossesMachinery Pass
LocationMontana Line - Sheridan
RouteInterstate 90
CountySheridan County
StateWyoming
Coordinates44.85769, -106.98979
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating27.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length68 ft (20.6 m)
Longest span25 ft (7.6 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,925 (2024)
Projected traffic5,495 by 2043
Trucks22%
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-90 Wbl over Machinery Pass built?

It was built in 1959, making it 66 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 August 2023.

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

About 3,925 vehicles per day (2024 count), of which roughly 22% are trucks.

How long is I-90 Wbl over Machinery Pass?

The structure is 68 ft (20.6 m) long with a longest span of 25 ft (7.6 m) and a deck 41 ft wide.

Who owns I-90 Wbl over Machinery Pass?

It is owned by the State Highway Agency.