US Bridges

Nfa A078 over North Fork Obion River

PoorPosted for load

Henry County, Tennessee · 6 Mi. N. of SR 69 · Structure no. 400A0780003

Built
1980
45 years old
Condition
Poor
inspected September 2023
Type
Channel Beam
Concrete
Length
95 ft
4 main spans
Daily traffic
40
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A078 over North Fork Obion River is a concrete channel beam carrying Nfa A078 over North Fork Obion River in Henry County, Tennessee. It was built in 1980, so it is 45 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 2% of them trucks, projected to reach 64 by 2042. The structure is 95 ft (29 m) long and 25 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesNfa A078
CrossesNorth Fork Obion River
Location6 Mi. N. of SR 69
RouteCounty Highway 78
Coordinates36.42494, -88.41183
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating15.8 US tons
Inventory rating9.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadH 15
Structure length95 ft (29 m)
Longest span29 ft (8.7 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2020)
Projected traffic64 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A078 over North Fork Obion River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Nfa A078 over North Fork Obion River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Nfa A078 over North Fork Obion River carry?

About 40 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A078 over North Fork Obion River?

The structure is 95 ft (29 m) long with a longest span of 29 ft (8.7 m) and a deck 25 ft wide.

Who owns Nfa A078 over North Fork Obion River?

It is owned by the County Highway Agency.