US Bridges

Nfa B346 over I26

Fair

Sullivan County, Tennessee · Btwn I81-I26 JCT & CO LN · Structure no. 82I00260005

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
234 ft
4 main spans
Daily traffic
1,030
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa B346 over I26 is a concrete continuous tee beam carrying Nfa B346 over I26 in Sullivan County, Tennessee. It was built in 1968, so it is 57 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 1,030 vehicles a day, roughly 2% of them trucks, projected to reach 1,648 by 2042. The structure is 234 ft (71.3 m) long and 36 ft wide. If it were closed, the detour would be 44.1 mi (71 km).

CarriesNfa B346
CrossesI26
LocationBtwn I81-I26 JCT & CO LN
RouteCounty Highway 346
Coordinates36.43916, -82.52312
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating28.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length234 ft (71.3 m)
Longest span72 ft (21.9 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,030 (2020)
Projected traffic1,648 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed44.1 mi (71 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa B346 over I26 built?

It was built in 1968, making it 57 years old in 2025.

What condition is Nfa B346 over I26 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 2024.

How much traffic does Nfa B346 over I26 carry?

About 1,030 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa B346 over I26?

The structure is 234 ft (71.3 m) long with a longest span of 72 ft (21.9 m) and a deck 36 ft wide.

Who owns Nfa B346 over I26?

It is owned by the State Highway Agency.