US Bridges

FAS 347 over Blairs Gap Branch

Good

Sullivan County, Tennessee · .6 M NE of Hawkins CO LN · Structure no. 82S24630001

Built
1985
40 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
407
2021 count
Owner
State
State Highway Agency

About this bridge

FAS 347 over Blairs Gap Branch is a concrete continuous culvert carrying FAS 347 over Blairs Gap Branch in Sullivan County, Tennessee. It was built in 1985, so it is 40 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 407 vehicles a day, roughly 4% of them trucks, projected to reach 520 by 2041. The structure is 31 ft (9.4 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesFAS 347
CrossesBlairs Gap Branch
Location.6 M NE of Hawkins CO LN
RouteState Highway 347
CountySullivan County
StateTennessee
Coordinates36.45016, -82.67935
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span14 ft (4.3 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic407 (2021)
Projected traffic520 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 347 over Blairs Gap Branch built?

It was built in 1985, making it 40 years old in 2025.

What condition is FAS 347 over Blairs Gap Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does FAS 347 over Blairs Gap Branch carry?

About 407 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is FAS 347 over Blairs Gap Branch?

The structure is 31 ft (9.4 m) long with a longest span of 14 ft (4.3 m) and a deck 29 ft wide.

Who owns FAS 347 over Blairs Gap Branch?

It is owned by the State Highway Agency.