US Bridges

I75 over Tennessee River

Good

Loudon County, Tennessee · 3 M SE of City of Loudon · Structure no. 53I00750016

Built
1977
48 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,672 ft
8 main spans
Daily traffic
52,785
2021 count
Owner
State
State Highway Agency

About this bridge

I75 over Tennessee River is a steel continuous stringer/multi-beam or girder carrying I75 over Tennessee River in Loudon County, Tennessee. It was built in 1977, so it is 48 years old, older than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 52,785 vehicles a day, roughly 6% of them trucks, projected to reach 84,456 by 2042. The structure is 1,672 ft (509.6 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI75
CrossesTennessee River
Location3 M SE of City of Loudon
RouteInterstate 75
Coordinates35.75497, -84.37563
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.7 US tons
Inventory rating16.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20 + Mod
Structure length1,672 ft (509.6 m)
Longest span400 ft (121.9 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,785 (2021)
Projected traffic84,456 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I75 over Tennessee River built?

It was built in 1977, making it 48 years old in 2025.

What condition is I75 over Tennessee River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does I75 over Tennessee River carry?

About 52,785 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is I75 over Tennessee River?

The structure is 1,672 ft (509.6 m) long with a longest span of 400 ft (121.9 m) and a deck 42 ft wide.

Who owns I75 over Tennessee River?

It is owned by the State Highway Agency.