US Bridges

KY-510 over Koyle Br of Line Fork

Good

Letcher County, Kentucky · 2.8 MI West of JCT Ky 463 · Structure no. 067B00048N

Built
1959
66 years old
Condition
Good
inspected May 2021
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
481
2021 count
Owner
State
State Highway Agency

About this bridge

KY-510 over Koyle Br of Line Fork is a concrete culvert carrying KY-510 over Koyle Br of Line Fork in Letcher County, Kentucky. It was built in 1959, so it is 66 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 481 vehicles a day, projected to reach 481 by 2041. The structure is 30 ft (9 m) long and 31 ft wide. If it were closed, the detour would be 13.7 mi (22 km).

Location

Open in Google Maps
CarriesKY-510
CrossesKoyle Br of Line Fork
Location2.8 MI West of JCT Ky 463
RouteState Highway 510
CountyLetcher County
StateKentucky
Coordinates36.9825, -83.08861
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
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
Waterway adequacy7: Better than 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 loadH 15
Structure length30 ft (9 m)
Longest span14 ft (4.3 m)
Deck width31 ft (9.3 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic481 (2021)
Projected traffic481 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13.7 mi (22 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-510 over Koyle Br of Line Fork built?

It was built in 1959, making it 66 years old in 2025.

What condition is KY-510 over Koyle Br of Line Fork 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-510 over Koyle Br of Line Fork carry?

About 481 vehicles per day (2021 count).

How long is KY-510 over Koyle Br of Line Fork?

The structure is 30 ft (9 m) long with a longest span of 14 ft (4.3 m) and a deck 31 ft wide.

Who owns KY-510 over Koyle Br of Line Fork?

It is owned by the State Highway Agency.