US Bridges

KY-187 over Flat Rock Branch

Fair

Grayson County, Kentucky · .20 MI Nor. of Wky Pw UP · Structure no. 043B00012N

Built
1937
88 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
3,176
2022 count
Owner
State
State Highway Agency

About this bridge

KY-187 over Flat Rock Branch is a concrete culvert carrying KY-187 over Flat Rock Branch in Grayson County, Kentucky. It was built in 1937, so it is 88 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.

It carries about 3,176 vehicles a day, roughly 9% of them trucks, projected to reach 3,176 by 2042. The structure is 23 ft (7 m) long and 24 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesKY-187
CrossesFlat Rock Branch
Location.20 MI Nor. of Wky Pw UP
RouteState Highway 187
CountyGrayson County
StateKentucky
Coordinates37.4525, -86.34083
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,176 (2022)
Projected traffic3,176 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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-187 over Flat Rock Branch built?

It was built in 1937, making it 88 years old in 2025.

What condition is KY-187 over Flat Rock 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 October 2024.

How much traffic does KY-187 over Flat Rock Branch carry?

About 3,176 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is KY-187 over Flat Rock Branch?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 24 ft wide.

Who owns KY-187 over Flat Rock Branch?

It is owned by the State Highway Agency.