US Bridges

Nfa A579 over I81

FairPosted for load

Jefferson County, Tennessee · Just SW of SR351 Exit · Structure no. 45I00810005

Built
1966
59 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
359 ft
5 main spans
Daily traffic
300
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A579 over I81 is a concrete continuous tee beam carrying Nfa A579 over I81 in Jefferson County, Tennessee. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.

It carries about 300 vehicles a day, roughly 2% of them trucks, projected to reach 480 by 2042. The structure is 359 ft (109.4 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesNfa A579
CrossesI81
LocationJust SW of SR351 Exit
RouteCounty Highway 579
CountyJefferson County
StateTennessee
Coordinates36.09655, -83.34793
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.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20 US tons
Inventory rating16.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length359 ft (109.4 m)
Longest span79 ft (24.2 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2020)
Projected traffic480 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa A579 over I81 built?

It was built in 1966, making it 59 years old in 2025.

What condition is Nfa A579 over I81 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 June 2024.

How much traffic does Nfa A579 over I81 carry?

About 300 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A579 over I81?

The structure is 359 ft (109.4 m) long with a longest span of 79 ft (24.2 m) and a deck 29 ft wide.

Who owns Nfa A579 over I81?

It is owned by the State Highway Agency.