US Bridges

I75 350029M over CSX Railroad

Fair

Hamilton County, Tennessee · 1.4 MI N of I-24 Junction · Structure no. 33I00750023

Built
1960
65 years old, rebuilt 1992
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
140 ft
3 main spans
Daily traffic
137,904
2021 count
Owner
State
State Highway Agency

About this bridge

I75 350029M over CSX Railroad is a prestressed concrete box beam or girders - multiple carrying I75 350029M over CSX Railroad in Hamilton County, Tennessee. It was built in 1960 and reconstructed in 1992, so it is 65 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 137,904 vehicles a day, roughly 7% of them trucks, projected to reach 207,712 by 2040. The structure is 140 ft (42.7 m) long and 130 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesI75 350029M
CrossesCSX Railroad
Location1.4 MI N of I-24 Junction
RouteInterstate 75
CountyHamilton County
StateTennessee
Coordinates35.011, -85.18937
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span51 ft (15.5 m)
Deck width130 ft (39.6 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic137,904 (2021)
Projected traffic207,712 by 2040
Trucks7%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed123.7 mi (199 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$3.6 million (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I75 350029M over CSX Railroad built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1992.

What condition is I75 350029M over CSX Railroad 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 July 2024.

How much traffic does I75 350029M over CSX Railroad carry?

About 137,904 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is I75 350029M over CSX Railroad?

The structure is 140 ft (42.7 m) long with a longest span of 51 ft (15.5 m) and a deck 130 ft wide.

Who owns I75 350029M over CSX Railroad?

It is owned by the State Highway Agency.