US Bridges

Indigo Rd. over Trib. S. Cottonwood Riv.

FairPosted for load

Marion County, Kansas · 0.9S of Hillsboro · Structure no. 000000000570220

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

About this bridge

Indigo Rd. over Trib. S. Cottonwood Riv. is a concrete culvert carrying Indigo Rd. over Trib. S. Cottonwood Riv. 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 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 1,500 vehicles a day, projected to reach 1,590 by 2045. The structure is 38 ft (11.6 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesIndigo Rd.
CrossesTrib. S. Cottonwood Riv.
Location0.9S of Hillsboro
RouteCounty Highway 422
CountyMarion County
StateKansas
Coordinates38.33492, -97.20606
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 protection7 GoodSome minor problems.
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 geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.7 US tons
Inventory rating21.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length38 ft (11.6 m)
Longest span12 ft (3.6 m)
Deck width46 ft (13.9 m)
Roadway width44 ft (13.4 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 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. S. Cottonwood Riv. built?

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

What condition is Indigo Rd. over Trib. S. Cottonwood Riv. 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. S. Cottonwood Riv. carry?

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

How long is Indigo Rd. over Trib. S. Cottonwood Riv.?

The structure is 38 ft (11.6 m) long with a longest span of 12 ft (3.6 m) and a deck 46 ft wide.

Who owns Indigo Rd. over Trib. S. Cottonwood Riv.?

It is owned by the County Highway Agency.