US Bridges

KY-121 over Clarks River Overflow

Good

Calloway County, Kentucky · 1.0 MI West of JCT Ky 894 · Structure no. 018B00125N

Built
1956
69 years old
Condition
Good
inspected May 2021
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
162 ft
6 main spans
Daily traffic
6,438
2023 count
Owner
State
State Highway Agency

About this bridge

KY-121 over Clarks River Overflow is a prestressed concrete continuous box beam or girders - single or spread carrying KY-121 over Clarks River Overflow in Calloway County, Kentucky. It was built in 1956, so it is 69 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 6,438 vehicles a day, roughly 14% of them trucks, projected to reach 6,438 by 2043. The structure is 162 ft (49.4 m) long and 35 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

CarriesKY-121
CrossesClarks River Overflow
Location1.0 MI West of JCT Ky 894
RouteState Highway 121
Coordinates36.59083, -88.3
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110 US tons
Inventory rating84.1 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 25 or greater
Structure length162 ft (49.4 m)
Longest span27 ft (8.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,438 (2023)
Projected traffic6,438 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 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-121 over Clarks River Overflow built?

It was built in 1956, making it 69 years old in 2025.

What condition is KY-121 over Clarks River Overflow 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 May 2021.

How much traffic does KY-121 over Clarks River Overflow carry?

About 6,438 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is KY-121 over Clarks River Overflow?

The structure is 162 ft (49.4 m) long with a longest span of 27 ft (8.2 m) and a deck 35 ft wide.

Who owns KY-121 over Clarks River Overflow?

It is owned by the State Highway Agency.