US Bridges

Nfa A746 over Overflow

FairPosted for load

Carter County, Tennessee · 1.5 M FR Hampton · Structure no. 10SR0670009

Built
1941
84 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
55 ft
2 main spans
Daily traffic
2,460
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A746 over Overflow is a concrete tee beam carrying Nfa A746 over Overflow in Carter County, Tennessee. It was built in 1941, so it is 84 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 2,460 vehicles a day, roughly 2% of them trucks, projected to reach 3,936 by 2041. The structure is 55 ft (16.8 m) long and 40 ft wide. If it were closed, the detour would be 65.9 mi (106 km).

Location

Open in Google Maps
CarriesNfa A746
CrossesOverflow
Location1.5 M FR Hampton
RouteCounty Highway 746
CountyCarter County
StateTennessee
Coordinates36.28855, -82.17149
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length55 ft (16.8 m)
Longest span30 ft (9.1 m)
Deck width40 ft (12.2 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,460 (2020)
Projected traffic3,936 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed65.9 mi (106 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A746 over Overflow built?

It was built in 1941, making it 84 years old in 2025.

What condition is Nfa A746 over Overflow 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 August 2023.

How much traffic does Nfa A746 over Overflow carry?

About 2,460 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A746 over Overflow?

The structure is 55 ft (16.8 m) long with a longest span of 30 ft (9.1 m) and a deck 40 ft wide.

Who owns Nfa A746 over Overflow?

It is owned by the County Highway Agency.