US Bridges

Nfa A412 over Branch

Fair

Grainger County, Tennessee · East of SR1 · Structure no. 290A4120001

Built
1923
102 years old
Condition
Fair
inspected April 2023
Type
Arch - Deck
Concrete
Length
26 ft
1 main span
Daily traffic
160
2020 count
Owner
County
County Highway Agency

About this bridge

Nfa A412 over Branch is a concrete arch - deck carrying Nfa A412 over Branch in Grainger County, Tennessee. It was built in 1923, so it is 102 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 6 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 160 vehicles a day, roughly 4% of them trucks, projected to reach 256 by 2041. The structure is 26 ft (7.8 m) long and 17 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNfa A412
CrossesBranch
LocationEast of SR1
RouteCounty Highway 412
CountyGrainger County
StateTennessee
Coordinates36.1493, -83.6368
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating39.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.8 m)
Longest span20 ft (6.2 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2020)
Projected traffic256 by 2041
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$145,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa A412 over Branch built?

It was built in 1923, making it 102 years old in 2025.

What condition is Nfa A412 over 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 April 2023.

How much traffic does Nfa A412 over Branch carry?

About 160 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Nfa A412 over Branch?

The structure is 26 ft (7.8 m) long with a longest span of 20 ft (6.2 m) and a deck 17 ft wide.

Who owns Nfa A412 over Branch?

It is owned by the County Highway Agency.