US Bridges

Indigo Rd. over Antelope Creek

GoodPosted for load

Marion County, Kansas · 4.6S of Hillsboro · Structure no. 000000000570190

Built
1967
58 years old
Condition
Good
inspected January 2025
Type
Culvert
Concrete
Length
51 ft
4 main spans
Daily traffic
1,500
2020 count
Owner
County
County Highway Agency

About this bridge

Indigo Rd. over Antelope Creek is a concrete culvert carrying Indigo Rd. over Antelope Creek in Marion County, Kansas. It was built in 1967, so it is 58 years old, older than the Kansas average of 52.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 1,500 vehicles a day, roughly 10% of them trucks, projected to reach 1,650 by 2045. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIndigo Rd.
CrossesAntelope Creek
Location4.6S of Hillsboro
RouteCounty Highway 422
StateKansas
Coordinates38.28158, -97.206
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadH 20
Structure length51 ft (15.5 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic1,500 (2020)
Projected traffic1,650 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Indigo Rd. over Antelope Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Indigo Rd. over Antelope Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Indigo Rd. over Antelope Creek carry?

About 1,500 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Indigo Rd. over Antelope Creek?

The structure is 51 ft (15.5 m) long with a longest span of 12 ft (3.6 m).

Who owns Indigo Rd. over Antelope Creek?

It is owned by the County Highway Agency.