US Bridges

Indigo Rd. over Trib. to Antelope Creek

FairPosted for load

Marion County, Kansas · 6.9S of Hillsboro · Structure no. 000000000570170

Built
1970
55 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
33 ft
3 main spans
Daily traffic
1,165
2020 count
Owner
County
County Highway Agency

About this bridge

Indigo Rd. over Trib. to Antelope Creek is a concrete culvert carrying Indigo Rd. over Trib. to Antelope Creek in Marion County, Kansas. It was built in 1970, so it is 55 years old, older than the Kansas average of 52.8 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. Its operating status is: posted for load restriction.

It carries about 1,165 vehicles a day, projected to reach 1,230 by 2045. The structure is 33 ft (10.1 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIndigo Rd.
CrossesTrib. to Antelope Creek
Location6.9S of Hillsboro
RouteCounty Highway 422
CountyMarion County
StateKansas
Coordinates38.24744, -97.20689
Functional classRural Major 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length33 ft (10.1 m)
Longest span10 ft (2.9 m)
Deck width53 ft (16.2 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic1,165 (2020)
Projected traffic1,230 by 2045
Trucks0%
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 Trib. to Antelope Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is Indigo Rd. over Trib. to 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 January 2025.

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

About 1,165 vehicles per day (2020 count).

How long is Indigo Rd. over Trib. to Antelope Creek?

The structure is 33 ft (10.1 m) long with a longest span of 10 ft (2.9 m) and a deck 53 ft wide.

Who owns Indigo Rd. over Trib. to Antelope Creek?

It is owned by the County Highway Agency.