US Bridges

KY-121 over Overflow Structure

FairPosted for load

Calloway County, Kentucky · .57 MI West of JCT Ky 444 · Structure no. 018B00024N

Built
1945
80 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
87 ft
3 main spans
Daily traffic
3,080
2022 count
Owner
State
State Highway Agency

About this bridge

KY-121 over Overflow Structure is a concrete tee beam carrying KY-121 over Overflow Structure in Calloway County, Kentucky. It was built in 1945, so it is 80 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. Its operating status is: posted for load restriction.

It carries about 3,080 vehicles a day, roughly 14% of them trucks, projected to reach 3,080 by 2042. The structure is 87 ft (26.5 m) long and 26 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesKY-121
CrossesOverflow Structure
Location.57 MI West of JCT Ky 444
RouteState Highway 121
CountyCalloway County
StateKentucky
Coordinates36.54861, -88.16278
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 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
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length87 ft (26.5 m)
Longest span26 ft (7.9 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,080 (2022)
Projected traffic3,080 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$282,000
NavigationNo navigation control on waterway

Frequently asked questions

When was KY-121 over Overflow Structure built?

It was built in 1945, making it 80 years old in 2025.

What condition is KY-121 over Overflow Structure 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-121 over Overflow Structure carry?

About 3,080 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is KY-121 over Overflow Structure?

The structure is 87 ft (26.5 m) long with a longest span of 26 ft (7.9 m) and a deck 26 ft wide.

Who owns KY-121 over Overflow Structure?

It is owned by the State Highway Agency.