US Bridges

320 Rd. over Trib. N. Cottonwood Riv.

GoodPosted for load

Marion County, Kansas · 3.4N 6.4W of Durham · Structure no. 000570819105020

Built
1930
95 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
10
2020 count
Owner
County
County Highway Agency

About this bridge

320 Rd. over Trib. N. Cottonwood Riv. is a concrete culvert carrying 320 Rd. over Trib. N. Cottonwood Riv. in Marion County, Kansas. It was built in 1930, so it is 95 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 10 vehicles a day, roughly 5% of them trucks, projected to reach 15 by 2044. The structure is 21 ft (6.3 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries320 Rd.
CrossesTrib. N. Cottonwood Riv.
Location3.4N 6.4W of Durham
RouteCounty Highway 0
CountyMarion County
StateKansas
Coordinates38.53672, -97.35061
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic10 (2020)
Projected traffic15 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 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 320 Rd. over Trib. N. Cottonwood Riv. built?

It was built in 1930, making it 95 years old in 2025.

What condition is 320 Rd. over Trib. N. Cottonwood Riv. 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 November 2024.

How much traffic does 320 Rd. over Trib. N. Cottonwood Riv. carry?

About 10 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 320 Rd. over Trib. N. Cottonwood Riv.?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 23 ft wide.

Who owns 320 Rd. over Trib. N. Cottonwood Riv.?

It is owned by the County Highway Agency.