US Bridges

I-75 over I-285 Ramp Cbl Cd

Good

Cobb County, Georgia · 6.7 MI SE of Marietta · Structure no. 000000006700660

Built
1963
62 years old, rebuilt 2018
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
170 ft
3 main spans
Daily traffic
149,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-75 over I-285 Ramp Cbl Cd is a steel continuous stringer/multi-beam or girder carrying I-75 over I-285 Ramp Cbl Cd in Cobb County, Georgia. It was built in 1963 and reconstructed in 2018, so it is 62 years old, older than the Georgia average of 47.5 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 149,000 vehicles a day, roughly 5% of them trucks, projected to reach 211,575 by 2032. The structure is 170 ft (51.8 m) long and 179 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesI-75
CrossesI-285 Ramp Cbl Cd
Location6.7 MI SE of Marietta
RouteInterstate 75
StateGeorgia
Coordinates33.88971, -84.46035
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating35.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length170 ft (51.8 m)
Longest span78 ft (23.8 m)
Deck width179 ft (54.6 m)
Roadway width158 ft (48.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic149,000 (2024)
Projected traffic211,575 by 2032
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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$2.6 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 over I-285 Ramp Cbl Cd built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2018.

What condition is I-75 over I-285 Ramp Cbl Cd 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 June 2023.

How much traffic does I-75 over I-285 Ramp Cbl Cd carry?

About 149,000 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is I-75 over I-285 Ramp Cbl Cd?

The structure is 170 ft (51.8 m) long with a longest span of 78 ft (23.8 m) and a deck 179 ft wide.

Who owns I-75 over I-285 Ramp Cbl Cd?

It is owned by the State Highway Agency.