US Bridges

KY-645 over Rockhouse Fork

Fair

Martin County, Kentucky · @jct Ky 1884 · Structure no. 080B00021R

Built
1979
46 years old
Condition
Fair
inspected August 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
111 ft
1 main span
Daily traffic
1,921
2019 count
Owner
State
State Highway Agency

About this bridge

KY-645 over Rockhouse Fork is a steel stringer/multi-beam or girder carrying KY-645 over Rockhouse Fork in Martin County, Kentucky. It was built in 1979, so it is 46 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 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 1,921 vehicles a day, roughly 9% of them trucks, projected to reach 1,921 by 2039. The structure is 111 ft (33.9 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesKY-645
CrossesRockhouse Fork
Location@jct Ky 1884
RouteState Highway 645
CountyMartin County
StateKentucky
Coordinates37.91278, -82.58083
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.6 US tons
Inventory rating51.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length111 ft (33.9 m)
Longest span106 ft (32.3 m)
Deck width50 ft (15.2 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,921 (2019)
Projected traffic1,921 by 2039
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 KY-645 over Rockhouse Fork built?

It was built in 1979, making it 46 years old in 2025.

What condition is KY-645 over Rockhouse Fork 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 August 2021.

How much traffic does KY-645 over Rockhouse Fork carry?

About 1,921 vehicles per day (2019 count), of which roughly 9% are trucks.

How long is KY-645 over Rockhouse Fork?

The structure is 111 ft (33.9 m) long with a longest span of 106 ft (32.3 m) and a deck 50 ft wide.

Who owns KY-645 over Rockhouse Fork?

It is owned by the State Highway Agency.