US Bridges

Nfa A556 over Middle Fork Obion River

FairPosted for load

Henry County, Tennessee · 3 Mi. S. of SR54 · Structure no. 400A5560005

Built
1960
65 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
38 ft
2 main spans
Daily traffic
260
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A556 over Middle Fork Obion River is a concrete channel beam carrying Nfa A556 over Middle Fork Obion River in Henry County, Tennessee. It was built in 1960, so it is 65 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 260 vehicles a day, roughly 2% of them trucks, projected to reach 416 by 2042. The structure is 38 ft (11.6 m) long and 25 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNfa A556
CrossesMiddle Fork Obion River
Location3 Mi. S. of SR54
RouteCounty Highway 556
CountyHenry County
StateTennessee
Coordinates36.27616, -88.3715
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadUnknown
Structure length38 ft (11.6 m)
Longest span19 ft (5.8 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic260 (2020)
Projected traffic416 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$275,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A556 over Middle Fork Obion River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Nfa A556 over Middle Fork 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 Nfa A556 over Middle Fork Obion River carry?

About 260 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A556 over Middle Fork Obion River?

The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 25 ft wide.

Who owns Nfa A556 over Middle Fork Obion River?

It is owned by the County Highway Agency.