US Bridges

I24 over Sequatchie River

Poor

Marion County, Tennessee · 0.5 MI S of SR28 · Structure no. 58I00240037

Built
1965
60 years old, rebuilt 1981
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
492 ft
7 main spans
Daily traffic
52,102
2021 count
Owner
State
State Highway Agency

About this bridge

I24 over Sequatchie River is a prestressed concrete continuous stringer/multi-beam or girder carrying I24 over Sequatchie River in Marion County, Tennessee. It was built in 1965 and reconstructed in 1981, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 52,102 vehicles a day, roughly 7% of them trucks, projected to reach 83,363 by 2042. The structure is 492 ft (150 m) long and 44 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI24
CrossesSequatchie River
Location0.5 MI S of SR28
RouteInterstate 24
Coordinates35.04842, -85.62656
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating27.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans7
Design loadHS 20
Structure length492 ft (150 m)
Longest span71 ft (21.6 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,102 (2021)
Projected traffic83,363 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I24 over Sequatchie River built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1981.

What condition is I24 over Sequatchie River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does I24 over Sequatchie River carry?

About 52,102 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I24 over Sequatchie River?

The structure is 492 ft (150 m) long with a longest span of 71 ft (21.6 m) and a deck 44 ft wide.

Who owns I24 over Sequatchie River?

It is owned by the State Highway Agency.