US Bridges

Nfa A799 over Trivett Branch

Fair

Carter County, Tennessee · S of SR159 at State Line · Structure no. 100A7990001

Built
1983
42 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
70
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A799 over Trivett Branch is a concrete slab carrying Nfa A799 over Trivett Branch 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 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 70 vehicles a day, roughly 2% of them trucks, projected to reach 112 by 2041. The structure is 32 ft (9.9 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A799
CrossesTrivett Branch
LocationS of SR159 at State Line
RouteCounty Highway 799
CountyCarter County
StateTennessee
Coordinates36.2358, -81.96477
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length32 ft (9.9 m)
Longest span30 ft (9.2 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2020)
Projected traffic112 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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$227,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A799 over Trivett Branch built?

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

What condition is Nfa A799 over Trivett Branch 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 A799 over Trivett Branch carry?

About 70 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A799 over Trivett Branch?

The structure is 32 ft (9.9 m) long with a longest span of 30 ft (9.2 m) and a deck 28 ft wide.

Who owns Nfa A799 over Trivett Branch?

It is owned by the County Highway Agency.