US Bridges

I-575 (sbl) over I-75

Fair

Cobb County, Georgia · 3.6 MI SE of Kennesaw · Structure no. 000000006701100

Built
1980
45 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
533 ft
4 main spans
Daily traffic
17,400
2024 count
Owner
State
State Highway Agency

About this bridge

I-575 (sbl) over I-75 is a steel stringer/multi-beam or girder carrying I-575 (sbl) over I-75 in Cobb County, Georgia. It was built in 1980, so it is 45 years old, younger than the Georgia average of 47.5 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 17,400 vehicles a day, roughly 5% of them trucks, projected to reach 107,835 by 2032. The structure is 533 ft (162.5 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-575 (sbl)
CrossesI-75
Location3.6 MI SE of Kennesaw
RouteInterstate 575
CountyCobb County
StateGeorgia
Coordinates34.00023, -84.56216
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.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length533 ft (162.5 m)
Longest span167 ft (50.9 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,400 (2024)
Projected traffic107,835 by 2032
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$3.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-575 (sbl) over I-75 built?

It was built in 1980, making it 45 years old in 2025.

What condition is I-575 (sbl) over I-75 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 May 2023.

How much traffic does I-575 (sbl) over I-75 carry?

About 17,400 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is I-575 (sbl) over I-75?

The structure is 533 ft (162.5 m) long with a longest span of 167 ft (50.9 m) and a deck 44 ft wide.

Who owns I-575 (sbl) over I-75?

It is owned by the State Highway Agency.