US Bridges

Nfa A512 over I-24

Fair

Marion County, Tennessee · .1 MI at SR2 · Structure no. 58I00240015

Built
1963
62 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
245 ft
4 main spans
Daily traffic
740
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A512 over I-24 is a concrete continuous tee beam carrying Nfa A512 over I-24 in Marion County, Tennessee. It was built in 1963, so it is 62 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 740 vehicles a day, roughly 2% of them trucks, projected to reach 1,184 by 2040. The structure is 245 ft (74.7 m) long and 34 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesNfa A512
CrossesI-24
Location.1 MI at SR2
RouteCounty Highway 512
CountyMarion County
StateTennessee
Coordinates35.14583, -85.77538
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length245 ft (74.7 m)
Longest span71 ft (21.6 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic740 (2020)
Projected traffic1,184 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed49.7 mi (80 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 A512 over I-24 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Nfa A512 over I-24 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 July 2024.

How much traffic does Nfa A512 over I-24 carry?

About 740 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A512 over I-24?

The structure is 245 ft (74.7 m) long with a longest span of 71 ft (21.6 m) and a deck 34 ft wide.

Who owns Nfa A512 over I-24?

It is owned by the State Highway Agency.