US Bridges

FAP 78 over Obion River

Fair

Dyer County, Tennessee · 1.4 M SE JCT SR78&SR103 · Structure no. 23SR0780003

Built
1995
30 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
2,567 ft
20 main spans
Daily traffic
3,689
2021 count
Owner
State
State Highway Agency

About this bridge

FAP 78 over Obion River is a prestressed concrete continuous stringer/multi-beam or girder carrying FAP 78 over Obion River in Dyer County, Tennessee. It was built in 1995, so it is 30 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 3,689 vehicles a day, roughly 5% of them trucks, projected to reach 5,912 by 2042. The structure is 2,567 ft (782.4 m) long and 45 ft wide. If it were closed, the detour would be 73.9 mi (119 km).

Location

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CarriesFAP 78
CrossesObion River
Location1.4 M SE JCT SR78&SR103
RouteState Highway 78
CountyDyer County
StateTennessee
Coordinates36.13525, -89.43164
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans20
Design loadHS 20
Structure length2,567 ft (782.4 m)
Longest span134 ft (40.8 m)
Deck width45 ft (13.8 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,689 (2021)
Projected traffic5,912 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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$26.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FAP 78 over Obion River built?

It was built in 1995, making it 30 years old in 2025.

What condition is FAP 78 over Obion 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 October 2023.

How much traffic does FAP 78 over Obion River carry?

About 3,689 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FAP 78 over Obion River?

The structure is 2,567 ft (782.4 m) long with a longest span of 134 ft (40.8 m) and a deck 45 ft wide.

Who owns FAP 78 over Obion River?

It is owned by the State Highway Agency.