US Bridges

Local 21-8-6 over Slate Creek

FairPosted for load

Sumner County, Kansas · 1.4N 1.0E Conway Springs · Structure no. 000960789006566

Built
1970
55 years old, rebuilt 2017
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
2 main spans
Daily traffic
25
2012 count
Owner
County
County Highway Agency

About this bridge

Local 21-8-6 over Slate Creek is a steel stringer/multi-beam or girder carrying Local 21-8-6 over Slate Creek in Sumner County, Kansas. It was built in 1970 and reconstructed in 2017, so it is 55 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 25 vehicles a day, roughly 1% of them trucks, projected to reach 25 by 2043. The structure is 100 ft (30.5 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLocal 21-8-6
CrossesSlate Creek
Location1.4N 1.0E Conway Springs
RouteCounty Highway 0
CountySumner County
StateKansas
Coordinates37.40746, -97.62328
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.3 US tons
Inventory rating14.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length100 ft (30.5 m)
Longest span59 ft (18 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic25 (2012)
Projected traffic25 by 2043
Trucks1%
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 Local 21-8-6 over Slate Creek built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2017.

What condition is Local 21-8-6 over Slate Creek 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 May 2023.

How much traffic does Local 21-8-6 over Slate Creek carry?

About 25 vehicles per day (2012 count), of which roughly 1% are trucks.

How long is Local 21-8-6 over Slate Creek?

The structure is 100 ft (30.5 m) long with a longest span of 59 ft (18 m) and a deck 28 ft wide.

Who owns Local 21-8-6 over Slate Creek?

It is owned by the County Highway Agency.