US Bridges

SW 120th over Little Walnut River

Fair

Butler County, Kansas · 2.7W 2.5S of Leon · Structure no. 000080875806240

Built
1960
65 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
26 ft
3 main spans
Daily traffic
35
2023 count
Owner
County
County Highway Agency

About this bridge

SW 120th over Little Walnut River is a concrete culvert carrying SW 120th over Little Walnut River in Butler County, Kansas. It was built in 1960, so it is 65 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.

It carries about 35 vehicles a day, projected to reach 35 by 2045. The structure is 26 ft (7.9 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSW 120th
CrossesLittle Walnut River
Location2.7W 2.5S of Leon
RouteCounty Highway 0
CountyButler County
StateKansas
Coordinates37.65058, -96.82879
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length26 ft (7.9 m)
Longest span8 ft (2.4 m)
Deck width23 ft (7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic35 (2023)
Projected traffic35 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 SW 120th over Little Walnut River built?

It was built in 1960, making it 65 years old in 2025.

What condition is SW 120th over Little Walnut 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 July 2024.

How much traffic does SW 120th over Little Walnut River carry?

About 35 vehicles per day (2023 count).

How long is SW 120th over Little Walnut River?

The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m) and a deck 23 ft wide.

Who owns SW 120th over Little Walnut River?

It is owned by the County Highway Agency.