US Bridges

320 Rd. over Trib. N. Cottonwood Riv.

PoorPosted for load

Marion County, Kansas · 3.4N 3.7W of Durham · Structure no. 000570823905020

Built
1965
60 years old
Condition
Poor
inspected November 2024
Type
Culvert
Concrete
Length
21 ft
3 main spans
Daily traffic
45
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 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 45 vehicles a day, projected to reach 54 by 2044. The structure is 21 ft (6.4 m) long and 22 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 3.7W of Durham
RouteCounty Highway 0
CountyMarion County
StateKansas
Coordinates38.53672, -97.29911
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.7 US tons
Inventory rating25.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span7 ft (2.1 m)
Deck width22 ft (6.6 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic45 (2020)
Projected traffic54 by 2044
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$210,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 320 Rd. over Trib. N. Cottonwood Riv. built?

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

What condition is 320 Rd. over Trib. N. Cottonwood Riv. in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

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

About 45 vehicles per day (2020 count).

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

The structure is 21 ft (6.4 m) long with a longest span of 7 ft (2.1 m) and a deck 22 ft wide.

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

It is owned by the County Highway Agency.