US Bridges

SW 20th over Unnamed Watercourse

Fair

Butler County, Kansas · 0.5S 0.1W of Eldorado · Structure no. 000000000081120

Built
1930
95 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
38 ft
4 main spans
Daily traffic
2,470
2021 count
Owner
County
County Highway Agency

About this bridge

SW 20th over Unnamed Watercourse is a concrete continuous slab carrying SW 20th over Unnamed Watercourse in Butler 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 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.

It carries about 2,470 vehicles a day, roughly 3% of them trucks, projected to reach 2,200 by 2045. The structure is 38 ft (11.5 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSW 20th
CrossesUnnamed Watercourse
Location0.5S 0.1W of Eldorado
RouteCounty Highway 900
CountyButler County
StateKansas
Coordinates37.79546, -96.88204
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadUnknown
Structure length38 ft (11.5 m)
Longest span9 ft (2.7 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic2,470 (2021)
Projected traffic2,200 by 2045
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$275,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SW 20th over Unnamed Watercourse built?

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

What condition is SW 20th over Unnamed Watercourse 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 20th over Unnamed Watercourse carry?

About 2,470 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is SW 20th over Unnamed Watercourse?

The structure is 38 ft (11.5 m) long with a longest span of 9 ft (2.7 m) and a deck 31 ft wide.

Who owns SW 20th over Unnamed Watercourse?

It is owned by the County Highway Agency.