US Bridges

US 421 over Slickway Branch

Fair

Franklin County, Kentucky · 2 MI N of Woodford Cl · Structure no. 037B00009N

Built
1949
76 years old, rebuilt 2010
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
13,277
2022 count
Owner
State
State Highway Agency

About this bridge

US 421 over Slickway Branch is a concrete culvert carrying US 421 over Slickway Branch in Franklin County, Kentucky. It was built in 1949 and reconstructed in 2010, so it is 76 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 13,277 vehicles a day, roughly 9% of them trucks, projected to reach 13,277 by 2042. The structure is 24 ft (7.4 m) long and 194 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 421
CrossesSlickway Branch
Location2 MI N of Woodford Cl
RouteU.S. Route 421
CountyFranklin County
StateKentucky
Coordinates38.18694, -84.80278
Functional classUrban Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length24 ft (7.4 m)
Longest span11 ft (3.5 m)
Deck width194 ft (59.1 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,277 (2022)
Projected traffic13,277 by 2042
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 US 421 over Slickway Branch built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 2010.

What condition is US 421 over Slickway Branch 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 July 2024.

How much traffic does US 421 over Slickway Branch carry?

About 13,277 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is US 421 over Slickway Branch?

The structure is 24 ft (7.4 m) long with a longest span of 11 ft (3.5 m) and a deck 194 ft wide.

Who owns US 421 over Slickway Branch?

It is owned by the State Highway Agency.