US Bridges

KY-390 over Salt River

Fair

Mercer County, Kentucky · 4.2 MI W. JCT US 127 · Structure no. 084B00038N

Built
1990
35 years old
Condition
Fair
inspected August 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
99 ft
1 main span
Daily traffic
1,380
2021 count
Owner
State
State Highway Agency

About this bridge

KY-390 over Salt River is a prestressed concrete box beam or girders - multiple carrying KY-390 over Salt River in Mercer County, Kentucky. It was built in 1990, so it is 35 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 1,380 vehicles a day, projected to reach 1,380 by 2041. The structure is 99 ft (30.2 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesKY-390
CrossesSalt River
Location4.2 MI W. JCT US 127
RouteState Highway 390
CountyMercer County
StateKentucky
Coordinates37.80278, -84.88833
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating78.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length99 ft (30.2 m)
Longest span94 ft (28.8 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,380 (2021)
Projected traffic1,380 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$305,000
NavigationNo navigation control on waterway

Frequently asked questions

When was KY-390 over Salt River built?

It was built in 1990, making it 35 years old in 2025.

What condition is KY-390 over Salt River 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 2022.

How much traffic does KY-390 over Salt River carry?

About 1,380 vehicles per day (2021 count).

How long is KY-390 over Salt River?

The structure is 99 ft (30.2 m) long with a longest span of 94 ft (28.8 m) and a deck 24 ft wide.

Who owns KY-390 over Salt River?

It is owned by the State Highway Agency.