US Bridges

I75 Nbl over SR 39

Fair

McMinn County, Tennessee · 7.3 Mi. from Bradley Co. · Structure no. 54I00750009

Built
1972
53 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
95 ft
1 main span
Daily traffic
47,306
2021 count
Owner
State
State Highway Agency

About this bridge

I75 Nbl over SR 39 is a prestressed concrete box beam or girders - single or spread carrying I75 Nbl over SR 39 in McMinn County, Tennessee. It was built in 1972, so it is 53 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 47,306 vehicles a day, roughly 7% of them trucks, projected to reach 75,690 by 2042. The structure is 95 ft (29 m) long and 44 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI75 Nbl
CrossesSR 39
Location7.3 Mi. from Bradley Co.
RouteInterstate 75
CountyMcMinn County
StateTennessee
Coordinates35.3915, -84.71851
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span95 ft (29 m)
Deck width44 ft (13.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,306 (2021)
Projected traffic75,690 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I75 Nbl over SR 39 built?

It was built in 1972, making it 53 years old in 2025.

What condition is I75 Nbl over SR 39 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 April 2024.

How much traffic does I75 Nbl over SR 39 carry?

About 47,306 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I75 Nbl over SR 39?

The structure is 95 ft (29 m) long with a longest span of 95 ft (29 m) and a deck 44 ft wide.

Who owns I75 Nbl over SR 39?

It is owned by the State Highway Agency.