US Bridges

RD 121 over Coon Creek

FairPosted for load

Ford County, Kansas · 4.5W 6.0S of Spearville · Structure no. 000290547006086

Built
1935
90 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
2 main spans
Daily traffic
40
2018 count
Owner
County
County Highway Agency

About this bridge

RD 121 over Coon Creek is a wood or timber stringer/multi-beam or girder carrying RD 121 over Coon Creek in Ford County, Kansas. It was built in 1935, so it is 90 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 40 vehicles a day, roughly 5% of them trucks, projected to reach 48 by 2043. The structure is 32 ft (9.8 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesRD 121
CrossesCoon Creek
Location4.5W 6.0S of Spearville
RouteCounty Highway 0
CountyFord County
StateKansas
Coordinates37.75597, -99.83335
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating15.8 US tons
Inventory rating11.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span15 ft (4.7 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic40 (2018)
Projected traffic48 by 2043
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$260,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RD 121 over Coon Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is RD 121 over Coon 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 February 2023.

How much traffic does RD 121 over Coon Creek carry?

About 40 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is RD 121 over Coon Creek?

The structure is 32 ft (9.8 m) long with a longest span of 15 ft (4.7 m) and a deck 25 ft wide.

Who owns RD 121 over Coon Creek?

It is owned by the County Highway Agency.