US Bridges

Bh Cnty RD 229 over Antelope Creek

Fair

Big Horn County, Wyoming · 2 Miles S. of Basin · Structure no. EJR

Built
1926
99 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Concrete
Length
33 ft
1 main span
Daily traffic
343
2024 count
Owner
County
County Highway Agency

About this bridge

Bh Cnty RD 229 over Antelope Creek is a concrete tee beam carrying Bh Cnty RD 229 over Antelope Creek in Big Horn County, Wyoming. It was built in 1926, so it is 99 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 343 vehicles a day, roughly 9% of them trucks, projected to reach 480 by 2043. The structure is 33 ft (10.1 m) long and 23 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesBh Cnty RD 229
CrossesAntelope Creek
Location2 Miles S. of Basin
RouteCounty Highway 229
StateWyoming
Coordinates44.35771, -108.03475
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span31 ft (9.4 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic343 (2024)
Projected traffic480 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$39,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Bh Cnty RD 229 over Antelope Creek built?

It was built in 1926, making it 99 years old in 2025.

What condition is Bh Cnty RD 229 over Antelope Creek 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 Bh Cnty RD 229 over Antelope Creek carry?

About 343 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Bh Cnty RD 229 over Antelope Creek?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 23 ft wide.

Who owns Bh Cnty RD 229 over Antelope Creek?

It is owned by the County Highway Agency.