US Bridges

KY-20 over Willoughby Creek

FairPosted for load

Boone County, Kentucky · .30 MI Nor. of JCT Ky 18 · Structure no. 008B00019N

Built
1939
86 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
718
2021 count
Owner
State
State Highway Agency

About this bridge

KY-20 over Willoughby Creek is a concrete culvert carrying KY-20 over Willoughby Creek in Boone County, Kentucky. It was built in 1939, so it is 86 years old, older than the Kentucky average of 46.6 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 718 vehicles a day, roughly 19% of them trucks, projected to reach 718 by 2041. The structure is 23 ft (7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKY-20
CrossesWilloughby Creek
Location.30 MI Nor. of JCT Ky 18
RouteState Highway 20
CountyBoone County
StateKentucky
Coordinates38.99972, -84.82833
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic718 (2021)
Projected traffic718 by 2041
Trucks19%
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-20 over Willoughby Creek built?

It was built in 1939, making it 86 years old in 2025.

What condition is KY-20 over Willoughby 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 June 2023.

How much traffic does KY-20 over Willoughby Creek carry?

About 718 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is KY-20 over Willoughby Creek?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns KY-20 over Willoughby Creek?

It is owned by the State Highway Agency.