US Bridges

N 4th Street over Antelope Creek

Fair

Converse County, Wyoming · Douglas · Structure no. CFR

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
140 ft
3 main spans
Daily traffic
2,153
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

N 4th Street over Antelope Creek is a steel continuous stringer/multi-beam or girder carrying N 4th Street over Antelope Creek in Converse County, Wyoming. It was built in 1972, so it is 53 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.

It carries about 2,153 vehicles a day, roughly 10% of them trucks, projected to reach 3,014 by 2043. The structure is 140 ft (42.7 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesN 4th Street
CrossesAntelope Creek
LocationDouglas
RouteCity Street 4827
StateWyoming
Coordinates42.76917, -105.38262
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating56 US tons
Inventory rating38 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span54 ft (16.5 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,153 (2024)
Projected traffic3,014 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was N 4th Street over Antelope Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is N 4th Street 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 September 2024.

How much traffic does N 4th Street over Antelope Creek carry?

About 2,153 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is N 4th Street over Antelope Creek?

The structure is 140 ft (42.7 m) long with a longest span of 54 ft (16.5 m) and a deck 35 ft wide.

Who owns N 4th Street over Antelope Creek?

It is owned by the City or Municipal Highway Agency.