US Bridges

SR 280 over I-75 - I-75 Ramp

Good

Cobb County, Georgia · 4.2 MI SE of Marietta · Structure no. 000000006700570

Built
1965
60 years old, rebuilt 1990
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
303 ft
4 main spans
Daily traffic
31,600
2024 count
Owner
State
State Highway Agency

About this bridge

SR 280 over I-75 - I-75 Ramp is a steel continuous stringer/multi-beam or girder carrying SR 280 over I-75 - I-75 Ramp in Cobb County, Georgia. It was built in 1965 and reconstructed in 1990, so it is 60 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 31,600 vehicles a day, roughly 4% of them trucks, projected to reach 47,520 by 2032. The structure is 303 ft (92.4 m) long and 123 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSR 280
CrossesI-75 - I-75 Ramp
Location4.2 MI SE of Marietta
RouteState Highway 280
StateGeorgia
Coordinates33.9228, -84.4855
Functional classUrban Minor Arterial

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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31 US tons
Inventory rating18 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length303 ft (92.4 m)
Longest span91 ft (27.7 m)
Deck width123 ft (37.5 m)
Roadway width120 ft (36.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,600 (2024)
Projected traffic47,520 by 2032
Trucks4%
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$4.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 280 over I-75 - I-75 Ramp built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1990.

What condition is SR 280 over I-75 - I-75 Ramp 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 April 2023.

How much traffic does SR 280 over I-75 - I-75 Ramp carry?

About 31,600 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is SR 280 over I-75 - I-75 Ramp?

The structure is 303 ft (92.4 m) long with a longest span of 91 ft (27.7 m) and a deck 123 ft wide.

Who owns SR 280 over I-75 - I-75 Ramp?

It is owned by the State Highway Agency.