US Bridges

South Cobb Drive over I-285

Fair

Cobb County, Georgia · 4.5 Miles South East of S · Structure no. 000000006700520

Built
1969
56 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
241 ft
4 main spans
Daily traffic
43,800
2024 count
Owner
State
State Highway Agency

About this bridge

South Cobb Drive over I-285 is a steel stringer/multi-beam or girder carrying South Cobb Drive over I-285 in Cobb County, Georgia. It was built in 1969, so it is 56 years old, older 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 43,800 vehicles a day, roughly 1% of them trucks, projected to reach 73,110 by 2032. The structure is 241 ft (73.5 m) long and 103 ft wide.

Location

Open in Google Maps
CarriesSouth Cobb Drive
CrossesI-285
Location4.5 Miles South East of S
RouteState Highway 280
CountyCobb County
StateGeorgia
Coordinates33.82526, -84.48952
Functional classUrban Other Principal Arterial

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length241 ft (73.5 m)
Longest span70 ft (21.3 m)
Deck width103 ft (31.5 m)
Roadway width92 ft (28.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,800 (2024)
Projected traffic73,110 by 2032
Trucks1%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
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$3.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was South Cobb Drive over I-285 built?

It was built in 1969, making it 56 years old in 2025.

What condition is South Cobb Drive over I-285 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 September 2023.

How much traffic does South Cobb Drive over I-285 carry?

About 43,800 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is South Cobb Drive over I-285?

The structure is 241 ft (73.5 m) long with a longest span of 70 ft (21.3 m) and a deck 103 ft wide.

Who owns South Cobb Drive over I-285?

It is owned by the State Highway Agency.