US Bridges

KY-412 over Knob Creek

Good

Marion County, Kentucky · 4 MI NW of JCT Ky 289 · Structure no. 078B00057N

Built
1955
70 years old
Condition
Good
inspected January 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
151
2021 count
Owner
State
State Highway Agency

About this bridge

KY-412 over Knob Creek is a concrete culvert carrying KY-412 over Knob Creek in Marion County, Kentucky. It was built in 1955, so it is 70 years old, older 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 151 vehicles a day, projected to reach 151 by 2041. The structure is 29 ft (8.8 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesKY-412
CrossesKnob Creek
Location4 MI NW of JCT Ky 289
RouteState Highway 412
CountyMarion County
StateKentucky
Coordinates37.50833, -85.37306
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width31 ft (9.4 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic151 (2021)
Projected traffic151 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was KY-412 over Knob Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is KY-412 over Knob 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 January 2023.

How much traffic does KY-412 over Knob Creek carry?

About 151 vehicles per day (2021 count).

How long is KY-412 over Knob Creek?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 31 ft wide.

Who owns KY-412 over Knob Creek?

It is owned by the State Highway Agency.