US Bridges

Nfa A601 over I40

Fair

Putnam County, Tennessee · 12 MI from SR56 · Structure no. 71I00400009

Built
1960
65 years old, rebuilt 1998
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
224 ft
4 main spans
Daily traffic
170
2020 count
Owner
State
State Highway Agency

About this bridge

Nfa A601 over I40 is a prestressed concrete box beam or girders - multiple carrying Nfa A601 over I40 in Putnam County, Tennessee. It was built in 1960 and reconstructed in 1998, so it is 65 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 170 vehicles a day, roughly 2% of them trucks, projected to reach 272 by 2042. The structure is 224 ft (68.3 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNfa A601
CrossesI40
Location12 MI from SR56
RouteCounty Highway 601
CountyPutnam County
StateTennessee
Coordinates36.09713, -85.7122
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 inspectionMay 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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating81.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length224 ft (68.3 m)
Longest span63 ft (19.2 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2020)
Projected traffic272 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 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 A601 over I40 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1998.

What condition is Nfa A601 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 May 2024.

How much traffic does Nfa A601 over I40 carry?

About 170 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Nfa A601 over I40?

The structure is 224 ft (68.3 m) long with a longest span of 63 ft (19.2 m) and a deck 31 ft wide.

Who owns Nfa A601 over I40?

It is owned by the State Highway Agency.