US Bridges

Cl Cnty RD 99B over BNSF Railway

Fair

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

Built
1981
44 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
231 ft
3 main spans
Daily traffic
146
2024 count
Owner
County
County Highway Agency

About this bridge

Cl Cnty RD 99B over BNSF Railway is a steel continuous stringer/multi-beam or girder carrying Cl Cnty RD 99B over BNSF Railway in Campbell County, Wyoming. It was built in 1981, so it is 44 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 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 146 vehicles a day, roughly 10% of them trucks, projected to reach 204 by 2043. The structure is 231 ft (70.4 m) long and 29 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesCl Cnty RD 99B
CrossesBNSF Railway
Location20 Mi. S.E. of Gillette
RouteCounty Highway 99
CountyCampbell County
StateWyoming
Coordinates44.03127, -105.32647
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length231 ft (70.4 m)
Longest span89 ft (27.1 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 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
CrossesRailroad
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$91,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cl Cnty RD 99B over BNSF Railway built?

It was built in 1981, making it 44 years old in 2025.

What condition is Cl Cnty RD 99B over BNSF Railway 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 BNSF Railway carry?

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

How long is Cl Cnty RD 99B over BNSF Railway?

The structure is 231 ft (70.4 m) long with a longest span of 89 ft (27.1 m) and a deck 29 ft wide.

Who owns Cl Cnty RD 99B over BNSF Railway?

It is owned by the County Highway Agency.