US Bridges

Nfa A656 over Doe River

PoorPosted for load

Carter County, Tennessee · E of SR143-S of Roan Mtn. · Structure no. 100A6560001

Built
1983
42 years old
Condition
Poor
inspected June 2023
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
270
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A656 over Doe River is a concrete slab carrying Nfa A656 over Doe River in Carter County, Tennessee. It was built in 1983, so it is 42 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 270 vehicles a day, roughly 2% of them trucks, projected to reach 432 by 2041. The structure is 32 ft (9.7 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNfa A656
CrossesDoe River
LocationE of SR143-S of Roan Mtn.
RouteCounty Highway 656
CountyCarter County
StateTennessee
Coordinates36.17175, -82.07975
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.7 m)
Longest span30 ft (9 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2020)
Projected traffic432 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$242,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A656 over Doe River built?

It was built in 1983, making it 42 years old in 2025.

What condition is Nfa A656 over Doe 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 June 2023.

How much traffic does Nfa A656 over Doe River carry?

About 270 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A656 over Doe River?

The structure is 32 ft (9.7 m) long with a longest span of 30 ft (9 m) and a deck 25 ft wide.

Who owns Nfa A656 over Doe River?

It is owned by the County Highway Agency.