US Bridges

I-285 over South River

Good

DeKalb County, Georgia · 9.5 MI S of Decatur · Structure no. 000000008901020

Built
1966
59 years old, rebuilt 1984
Condition
Good
inspected March 2024
Type
Tee Beam
Concrete
Length
195 ft
5 main spans
Daily traffic
152,000
2024 count
Owner
State
State Highway Agency

About this bridge

I-285 over South River is a concrete tee beam carrying I-285 over South River in DeKalb County, Georgia. It was built in 1966 and reconstructed in 1984, so it is 59 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 152,000 vehicles a day, roughly 13% of them trucks, projected to reach 222,375 by 2031. The structure is 195 ft (59.4 m) long and 163 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-285
CrossesSouth River
Location9.5 MI S of Decatur
RouteInterstate 285
StateGeorgia
Coordinates33.68031, -84.31494
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.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.9 US tons
Inventory rating21.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length195 ft (59.4 m)
Longest span39 ft (11.9 m)
Deck width163 ft (49.7 m)
Roadway width157 ft (48 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic152,000 (2024)
Projected traffic222,375 by 2031
Trucks13%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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$3.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-285 over South River built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1984.

What condition is I-285 over South River 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 March 2024.

How much traffic does I-285 over South River carry?

About 152,000 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is I-285 over South River?

The structure is 195 ft (59.4 m) long with a longest span of 39 ft (11.9 m) and a deck 163 ft wide.

Who owns I-285 over South River?

It is owned by the State Highway Agency.