US Bridges

Nfa A644 over Doe River

Fair

Carter County, Tennessee · S of SR37-W of Roan Mtn. · Structure no. 100A6440001

Built
1998
27 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
2 main spans
Daily traffic
290
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A644 over Doe River is a steel stringer/multi-beam or girder carrying Nfa A644 over Doe River in Carter County, Tennessee. It was built in 1998, so it is 27 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 5 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 290 vehicles a day, roughly 2% of them trucks, projected to reach 464 by 2041. The structure is 82 ft (25 m) long and 19 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNfa A644
CrossesDoe River
LocationS of SR37-W of Roan Mtn.
RouteCounty Highway 644
CountyCarter County
StateTennessee
Coordinates36.20287, -82.10278
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating43.7 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadHS 20
Structure length82 ft (25 m)
Longest span37 ft (11.4 m)
Deck width19 ft (5.7 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2020)
Projected traffic464 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$337,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A644 over Doe River built?

It was built in 1998, making it 27 years old in 2025.

What condition is Nfa A644 over Doe 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 July 2023.

How much traffic does Nfa A644 over Doe River carry?

About 290 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A644 over Doe River?

The structure is 82 ft (25 m) long with a longest span of 37 ft (11.4 m) and a deck 19 ft wide.

Who owns Nfa A644 over Doe River?

It is owned by the County Highway Agency.