US Bridges

Indigo Rd. over South Cottonwood River

FairPosted for load

Marion County, Kansas · 3.2S of Hillsboro · Structure no. 000000000570200

Built
1942
83 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
140 ft
4 main spans
Daily traffic
1,500
2020 count
Owner
County
County Highway Agency

About this bridge

Indigo Rd. over South Cottonwood River is a concrete continuous slab carrying Indigo Rd. over South Cottonwood River in Marion County, Kansas. It was built in 1942, so it is 83 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 6 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 1,500 vehicles a day, projected to reach 1,590 by 2045. The structure is 140 ft (42.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIndigo Rd.
CrossesSouth Cottonwood River
Location3.2S of Hillsboro
RouteCounty Highway 422
CountyMarion County
StateKansas
Coordinates38.30369, -97.20619
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 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; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating25.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length140 ft (42.7 m)
Longest span38 ft (11.6 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic1,500 (2020)
Projected traffic1,590 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 statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Indigo Rd. over South Cottonwood River built?

It was built in 1942, making it 83 years old in 2025.

What condition is Indigo Rd. over South Cottonwood River 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 South Cottonwood River carry?

About 1,500 vehicles per day (2020 count).

How long is Indigo Rd. over South Cottonwood River?

The structure is 140 ft (42.7 m) long with a longest span of 38 ft (11.6 m) and a deck 28 ft wide.

Who owns Indigo Rd. over South Cottonwood River?

It is owned by the County Highway Agency.