US Bridges

Jonar Knob RD over Buffalo Creek

Good

Marion County, Kentucky · .1 MI S of Buffalo RD · Structure no. 078C00094N

Built
1992
33 years old
Condition
Good
inspected June 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
15
2010 count
Owner
County
County Highway Agency

About this bridge

Jonar Knob RD over Buffalo Creek is a prestressed concrete box beam or girders - multiple carrying Jonar Knob RD over Buffalo Creek in Marion County, Kentucky. It was built in 1992, so it is 33 years old, younger than the Kentucky average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, projected to reach 15 by 2030. The structure is 32 ft (9.8 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesJonar Knob RD
CrossesBuffalo Creek
Location.1 MI S of Buffalo RD
RouteCounty Highway 1123
CountyMarion County
StateKentucky
Coordinates37.52528, -85.05917
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length32 ft (9.8 m)
Longest span31 ft (9.3 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2010)
Projected traffic15 by 2030
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Jonar Knob RD over Buffalo Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is Jonar Knob RD over Buffalo Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2022.

How much traffic does Jonar Knob RD over Buffalo Creek carry?

About 15 vehicles per day (2010 count).

How long is Jonar Knob RD over Buffalo Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.3 m) and a deck 16 ft wide.

Who owns Jonar Knob RD over Buffalo Creek?

It is owned by the County Highway Agency.