US Bridges

Nfa A321 over I40

Fair

Roane County, Tennessee · Just W of Bradbury Exit · Structure no. 73I00400029

Built
1970
55 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
237 ft
4 main spans
Daily traffic
110
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A321 over I40 is a concrete continuous tee beam carrying Nfa A321 over I40 in Roane County, Tennessee. It was built in 1970, so it is 55 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 110 vehicles a day, roughly 2% of them trucks, projected to reach 176 by 2040. The structure is 237 ft (72.2 m) long and 29 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNfa A321
CrossesI40
LocationJust W of Bradbury Exit
RouteCounty Highway 321
CountyRoane County
StateTennessee
Coordinates35.86613, -84.38667
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating29.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length237 ft (72.2 m)
Longest span66 ft (20.1 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2020)
Projected traffic176 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa A321 over I40 built?

It was built in 1970, making it 55 years old in 2025.

What condition is Nfa A321 over I40 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 September 2024.

How much traffic does Nfa A321 over I40 carry?

About 110 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A321 over I40?

The structure is 237 ft (72.2 m) long with a longest span of 66 ft (20.1 m) and a deck 29 ft wide.

Who owns Nfa A321 over I40?

It is owned by the State Highway Agency.