US Bridges

US-68 over Salt River

Fair

Mercer County, Kentucky · 1.1 MI W of W-Jct Ky 152 · Structure no. 084B00032N

Built
1982
43 years old
Condition
Fair
inspected August 2022
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
99 ft
3 main spans
Daily traffic
2,449
2020 count
Owner
State
State Highway Agency

About this bridge

US-68 over Salt River is a prestressed concrete continuous box beam or girders - single or spread carrying US-68 over Salt River in Mercer County, Kentucky. It was built in 1982, so it is 43 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 2,449 vehicles a day, roughly 7% of them trucks, projected to reach 2,449 by 2040. The structure is 99 ft (30.2 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesUS-68
CrossesSalt River
Location1.1 MI W of W-Jct Ky 152
RouteU.S. Route 68
Coordinates37.74639, -84.86194
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating67 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length99 ft (30.2 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,449 (2020)
Projected traffic2,449 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$376,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US-68 over Salt River built?

It was built in 1982, making it 43 years old in 2025.

What condition is US-68 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 US-68 over Salt River carry?

About 2,449 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is US-68 over Salt River?

The structure is 99 ft (30.2 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns US-68 over Salt River?

It is owned by the State Highway Agency.