US Bridges

I-90 Wbl over Machinery Pass

Fair

Crook County, Wyoming · Moorcroft - Sundance · Structure no. BIL

Built
1961
64 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
1,829
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 Crook County, Wyoming. It was built in 1961, so it is 64 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 1,829 vehicles a day, roughly 27% of them trucks, projected to reach 2,561 by 2043. The structure is 93 ft (28.3 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
LocationMoorcroft - Sundance
RouteInterstate 90
CountyCrook County
StateWyoming
Coordinates44.323, -104.58055
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length93 ft (28.3 m)
Longest span35 ft (10.7 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,829 (2024)
Projected traffic2,561 by 2043
Trucks27%
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 1961, making it 64 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 June 2023.

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

About 1,829 vehicles per day (2024 count), of which roughly 27% are trucks.

How long is I-90 Wbl over Machinery Pass?

The structure is 93 ft (28.3 m) long with a longest span of 35 ft (10.7 m) and a deck 41 ft wide.

Who owns I-90 Wbl over Machinery Pass?

It is owned by the State Highway Agency.