US Bridges

Nfa A612 over I75

Fair

McMinn County, Tennessee · 3.1 MI from SR30 · Structure no. 54I00750031

Built
1973
52 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
342 ft
5 main spans
Daily traffic
510
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A612 over I75 is a prestressed concrete continuous box beam or girders - multiple carrying Nfa A612 over I75 in McMinn County, Tennessee. It was built in 1973, so it is 52 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 510 vehicles a day, roughly 2% of them trucks, projected to reach 816 by 2042. The structure is 342 ft (104.2 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNfa A612
CrossesI75
Location3.1 MI from SR30
RouteCounty Highway 612
Coordinates35.51123, -84.60301
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating35.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length342 ft (104.2 m)
Longest span93 ft (28.3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2020)
Projected traffic816 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nfa A612 over I75 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Nfa A612 over I75 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 April 2024.

How much traffic does Nfa A612 over I75 carry?

About 510 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A612 over I75?

The structure is 342 ft (104.2 m) long with a longest span of 93 ft (28.3 m) and a deck 32 ft wide.

Who owns Nfa A612 over I75?

It is owned by the State Highway Agency.