US Bridges

KY-645 over Middle Fork

Good

Martin County, Kentucky · 1000 East of JCT Ky 3 · Structure no. 080B00040N

Built
2004
21 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
232 ft
3 main spans
Daily traffic
4,537
2021 count
Owner
State
State Highway Agency

About this bridge

KY-645 over Middle Fork is a prestressed concrete continuous stringer/multi-beam or girder carrying KY-645 over Middle Fork in Martin County, Kentucky. It was built in 2004, so it is 21 years old, younger 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 4,537 vehicles a day, roughly 3% of them trucks, projected to reach 4,537 by 2041. The structure is 232 ft (70.7 m) long and 84 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesKY-645
CrossesMiddle Fork
Location1000 East of JCT Ky 3
RouteState Highway 645
Coordinates37.84833, -82.53917
Functional classRural Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.8 US tons
Inventory rating34.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length232 ft (70.7 m)
Longest span91 ft (27.7 m)
Deck width84 ft (25.5 m)
Roadway width81 ft (24.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,537 (2021)
Projected traffic4,537 by 2041
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Middle Fork built?

It was built in 2004, making it 21 years old in 2025.

What condition is KY-645 over Middle 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 August 2023.

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

About 4,537 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is KY-645 over Middle Fork?

The structure is 232 ft (70.7 m) long with a longest span of 91 ft (27.7 m) and a deck 84 ft wide.

Who owns KY-645 over Middle Fork?

It is owned by the State Highway Agency.