US Bridges

I75 over SR 71

FairPosted for load

Anderson County, Tennessee · 10.58 Mi.From Knox Co.Ln. · Structure no. 01I00750032

Built
1965
60 years old, rebuilt 1985
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
183 ft
3 main spans
Daily traffic
49,351
2021 count
Owner
State
State Highway Agency

About this bridge

I75 over SR 71 is a concrete continuous tee beam carrying I75 over SR 71 in Anderson County, Tennessee. It was built in 1965 and reconstructed in 1985, 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. Its operating status is: posted for load restriction.

It carries about 49,351 vehicles a day, roughly 6% of them trucks, projected to reach 78,962 by 2042. The structure is 183 ft (55.7 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesI75
CrossesSR 71
Location10.58 Mi.From Knox Co.Ln.
RouteInterstate 75
CountyAnderson County
StateTennessee
Coordinates36.22709, -84.15147
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.4 US tons
Inventory rating25.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length183 ft (55.7 m)
Longest span71 ft (21.6 m)
Deck width45 ft (13.6 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49,351 (2021)
Projected traffic78,962 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I75 over SR 71 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1985.

What condition is I75 over SR 71 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 August 2023.

How much traffic does I75 over SR 71 carry?

About 49,351 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I75 over SR 71?

The structure is 183 ft (55.7 m) long with a longest span of 71 ft (21.6 m) and a deck 45 ft wide.

Who owns I75 over SR 71?

It is owned by the State Highway Agency.