US Bridges

I40 over Nfa A046

Fair

Decatur County, Tennessee · 0.1 M E Carroll CO Line · Structure no. 20I00400001

Built
1965
60 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
98 ft
3 main spans
Daily traffic
31,176
2021 count
Owner
State
State Highway Agency

About this bridge

I40 over Nfa A046 is a prestressed concrete continuous stringer/multi-beam or girder carrying I40 over Nfa A046 in Decatur County, Tennessee. It was built in 1965, so it is 60 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 31,176 vehicles a day, roughly 8% of them trucks, projected to reach 45,061 by 2042. The structure is 98 ft (29.9 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI40
CrossesNfa A046
Location0.1 M E Carroll CO Line
RouteInterstate 40
CountyDecatur County
StateTennessee
Coordinates35.81889, -88.17806
Functional classRural Principal Arterial - Interstate

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 inspectionDecember 2023
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length98 ft (29.9 m)
Longest span35 ft (10.7 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,176 (2021)
Projected traffic45,061 by 2042
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$965,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 over Nfa A046 built?

It was built in 1965, making it 60 years old in 2025.

What condition is I40 over Nfa A046 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 December 2023.

How much traffic does I40 over Nfa A046 carry?

About 31,176 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is I40 over Nfa A046?

The structure is 98 ft (29.9 m) long with a longest span of 35 ft (10.7 m) and a deck 40 ft wide.

Who owns I40 over Nfa A046?

It is owned by the State Highway Agency.