US Bridges

US 421 over Stony Creek

Fair

Franklin County, Kentucky · 1.85 MI N of Ky 1570 · Structure no. 037B00085N

Built
1984
41 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete
Length
115 ft
4 main spans
Daily traffic
2,128
2021 count
Owner
State
State Highway Agency

About this bridge

US 421 over Stony Creek is a concrete culvert carrying US 421 over Stony Creek in Franklin County, Kentucky. It was built in 1984, so it is 41 years old, younger 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 2,128 vehicles a day, roughly 12% of them trucks, projected to reach 2,128 by 2041. The structure is 115 ft (35.1 m) long and 89 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 421
CrossesStony Creek
Location1.85 MI N of Ky 1570
RouteU.S. Route 421
CountyFranklin County
StateKentucky
Coordinates38.24528, -84.92139
Functional classRural 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating109.9 US tons
Inventory rating65.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length115 ft (35.1 m)
Longest span28 ft (8.4 m)
Deck width89 ft (27.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,128 (2021)
Projected traffic2,128 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 421 over Stony Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is US 421 over Stony 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 July 2024.

How much traffic does US 421 over Stony Creek carry?

About 2,128 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is US 421 over Stony Creek?

The structure is 115 ft (35.1 m) long with a longest span of 28 ft (8.4 m) and a deck 89 ft wide.

Who owns US 421 over Stony Creek?

It is owned by the State Highway Agency.