US Bridges

FAS 352 over Big Branch

Fair

Unicoi County, Tennessee · 2.2 M NE JCT SR81&SR352 · Structure no. 86SR0810009

Built
1948
77 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
858
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 352 over Big Branch is a concrete continuous culvert carrying FAS 352 over Big Branch in Unicoi County, Tennessee. It was built in 1948, so it is 77 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 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 858 vehicles a day, roughly 2% of them trucks, projected to reach 1,776 by 2040. The structure is 21 ft (6.3 m) long and 39 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

Location

Open in Google Maps
CarriesFAS 352
CrossesBig Branch
Location2.2 M NE JCT SR81&SR352
RouteState Highway 352
CountyUnicoi County
StateTennessee
Coordinates36.05402, -82.528
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width39 ft (11.8 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic858 (2021)
Projected traffic1,776 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 FAS 352 over Big Branch built?

It was built in 1948, making it 77 years old in 2025.

What condition is FAS 352 over Big 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 October 2024.

How much traffic does FAS 352 over Big Branch carry?

About 858 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is FAS 352 over Big Branch?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 39 ft wide.

Who owns FAS 352 over Big Branch?

It is owned by the State Highway Agency.