US Bridges

Nfa A628 over Doe River

Fair

Carter County, Tennessee · N of SR37-E of SR173 Jct. · Structure no. 100A6280001

Built
1992
33 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
210
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A628 over Doe River is a prestressed concrete stringer/multi-beam or girder carrying Nfa A628 over Doe River in Carter County, Tennessee. It was built in 1992, so it is 33 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 210 vehicles a day, roughly 2% of them trucks, projected to reach 336 by 2042. The structure is 52 ft (15.8 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNfa A628
CrossesDoe River
LocationN of SR37-E of SR173 Jct.
RouteCounty Highway 628
CountyCarter County
StateTennessee
Coordinates36.23072, -82.15553
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.1 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span49 ft (14.8 m)
Deck width24 ft (7.4 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2020)
Projected traffic336 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A628 over Doe River built?

It was built in 1992, making it 33 years old in 2025.

What condition is Nfa A628 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 A628 over Doe River carry?

About 210 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A628 over Doe River?

The structure is 52 ft (15.8 m) long with a longest span of 49 ft (14.8 m) and a deck 24 ft wide.

Who owns Nfa A628 over Doe River?

It is owned by the County Highway Agency.