US Bridges

I40 Ramp to I75 SB over I75 Nbl

Fair

Loudon County, Tennessee · Near Knox Co. Line · Structure no. 53I00400013

Built
1964
61 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
430 ft
4 main spans
Daily traffic
41,804
2021 count
Owner
State
State Highway Agency

About this bridge

I40 Ramp to I75 SB over I75 Nbl is a prestressed concrete box beam or girders - single or spread carrying I40 Ramp to I75 SB over I75 Nbl in Loudon County, Tennessee. It was built in 1964, so it is 61 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 41,804 vehicles a day, roughly 6% of them trucks, projected to reach 66,886 by 2042. The structure is 430 ft (131.1 m) long and 36 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesI40 Ramp to I75 SB
CrossesI75 Nbl
LocationNear Knox Co. Line
RouteInterstate 40
CountyLoudon County
StateTennessee
Coordinates35.86868, -84.25713
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating34.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length430 ft (131.1 m)
Longest span120 ft (36.6 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,804 (2021)
Projected traffic66,886 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed19.9 mi (32 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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$5.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I40 Ramp to I75 SB over I75 Nbl built?

It was built in 1964, making it 61 years old in 2025.

What condition is I40 Ramp to I75 SB over I75 Nbl 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 October 2024.

How much traffic does I40 Ramp to I75 SB over I75 Nbl carry?

About 41,804 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I40 Ramp to I75 SB over I75 Nbl?

The structure is 430 ft (131.1 m) long with a longest span of 120 ft (36.6 m) and a deck 36 ft wide.

Who owns I40 Ramp to I75 SB over I75 Nbl?

It is owned by the State Highway Agency.