US Bridges

Cl Cnty RD 99B over Machinery Pass

Fair

Campbell County, Wyoming · 20 Mi. S.E. of Gillette · Structure no. FKG

Built
1983
42 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
113 ft
1 main span
Daily traffic
146
2024 count
Owner
County
County Highway Agency

About this bridge

Cl Cnty RD 99B over Machinery Pass is a prestressed concrete stringer/multi-beam or girder carrying Cl Cnty RD 99B over Machinery Pass in Campbell County, Wyoming. It was built in 1983, so it is 42 years old, younger 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 146 vehicles a day, roughly 10% of them trucks, projected to reach 204 by 2043. The structure is 113 ft (34.4 m) long and 40 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesCl Cnty RD 99B
CrossesMachinery Pass
Location20 Mi. S.E. of Gillette
RouteCounty Highway 99
StateWyoming
Coordinates44.03583, -105.34482
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 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 alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span103 ft (31.4 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic146 (2024)
Projected traffic204 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cl Cnty RD 99B over Machinery Pass built?

It was built in 1983, making it 42 years old in 2025.

What condition is Cl Cnty RD 99B 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 February 2025.

How much traffic does Cl Cnty RD 99B over Machinery Pass carry?

About 146 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Cl Cnty RD 99B over Machinery Pass?

The structure is 113 ft (34.4 m) long with a longest span of 103 ft (31.4 m) and a deck 40 ft wide.

Who owns Cl Cnty RD 99B over Machinery Pass?

It is owned by the County Highway Agency.