US Bridges

FAP 78 over Drainage Ditch

Good

Obion County, Tennessee · .3 Mi.S. of Lake Co. · Structure no. 66SR0780001

Built
1982
43 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
105 ft
2 main spans
Daily traffic
3,574
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 78 over Drainage Ditch is a prestressed concrete continuous stringer/multi-beam or girder carrying FAP 78 over Drainage Ditch in Obion County, Tennessee. It was built in 1982, so it is 43 years old, younger than the Tennessee average of 47.4 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 3,574 vehicles a day, roughly 5% of them trucks, projected to reach 5,221 by 2042. The structure is 105 ft (32 m) long and 46 ft wide. If it were closed, the detour would be 73.9 mi (119 km).

Location

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CarriesFAP 78
CrossesDrainage Ditch
Location.3 Mi.S. of Lake Co.
RouteState Highway 78
CountyObion County
StateTennessee
Coordinates36.22208, -89.47027
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating29.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length105 ft (32 m)
Longest span52 ft (15.8 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,574 (2021)
Projected traffic5,221 by 2042
Trucks5%
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 78 over Drainage Ditch built?

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

What condition is FAP 78 over Drainage Ditch 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 March 2023.

How much traffic does FAP 78 over Drainage Ditch carry?

About 3,574 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAP 78 over Drainage Ditch?

The structure is 105 ft (32 m) long with a longest span of 52 ft (15.8 m) and a deck 46 ft wide.

Who owns FAP 78 over Drainage Ditch?

It is owned by the State Highway Agency.