US Bridges

FAP 78 over Slough

Fair

Lake County, Tennessee · 2.5 M S JCT SR21&SR78 · Structure no. 48SR0780007

Built
1997
28 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
66 ft
4 main spans
Daily traffic
2,974
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 78 over Slough is a concrete continuous culvert carrying FAP 78 over Slough in Lake County, Tennessee. It was built in 1997, so it is 28 years old, younger than the Tennessee average of 47.4 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 2,974 vehicles a day, roughly 6% of them trucks, projected to reach 4,944 by 2040. The structure is 66 ft (20.2 m) long and 50 ft wide. If it were closed, the detour would be 73.9 mi (119 km).

Location

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CarriesFAP 78
CrossesSlough
Location2.5 M S JCT SR21&SR78
RouteState Highway 78
CountyLake County
StateTennessee
Coordinates36.34125, -89.46995
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20
Structure length66 ft (20.2 m)
Longest span15 ft (4.6 m)
Deck width50 ft (15.1 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,974 (2021)
Projected traffic4,944 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed73.9 mi (119 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 FAP 78 over Slough built?

It was built in 1997, making it 28 years old in 2025.

What condition is FAP 78 over Slough 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 May 2024.

How much traffic does FAP 78 over Slough carry?

About 2,974 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is FAP 78 over Slough?

The structure is 66 ft (20.2 m) long with a longest span of 15 ft (4.6 m) and a deck 50 ft wide.

Who owns FAP 78 over Slough?

It is owned by the State Highway Agency.