US Bridges

Diamond Rd. over S. Cottonwood River

FairPosted for load

Marion County, Kansas · 4.5W 1.5S of Hillsboro · Structure no. 000570825005305

Built
1965
60 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
71 ft
2 main spans
Daily traffic
40
2020 count
Owner
County
County Highway Agency

About this bridge

Diamond Rd. over S. Cottonwood River is a prestressed concrete tee beam carrying Diamond Rd. over S. Cottonwood River in Marion County, Kansas. It was built in 1965, so it is 60 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 40 vehicles a day, roughly 5% of them trucks, projected to reach 48 by 2044. The structure is 71 ft (21.5 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDiamond Rd.
CrossesS. Cottonwood River
Location4.5W 1.5S of Hillsboro
RouteCounty Highway 5701
CountyMarion County
StateKansas
Coordinates38.32667, -97.29806
Functional classRural Minor 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating15 US tons
Inventory rating15 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadUnknown
Structure length71 ft (21.5 m)
Longest span34 ft (10.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic40 (2020)
Projected traffic48 by 2044
Trucks5%
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 Diamond Rd. over S. Cottonwood River built?

It was built in 1965, making it 60 years old in 2025.

What condition is Diamond Rd. over S. 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 December 2024.

How much traffic does Diamond Rd. over S. Cottonwood River carry?

About 40 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Diamond Rd. over S. Cottonwood River?

The structure is 71 ft (21.5 m) long with a longest span of 34 ft (10.3 m) and a deck 26 ft wide.

Who owns Diamond Rd. over S. Cottonwood River?

It is owned by the County Highway Agency.