US Bridges

I-285 over South River Trib

Good

DeKalb County, Georgia · 9.5 MI S of Decatur · Structure no. 000000008901040

Built
1967
58 years old, rebuilt 1983
Condition
Good
inspected March 2024
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
98,600
2024 count
Owner
State
State Highway Agency

About this bridge

I-285 over South River Trib is a concrete culvert carrying I-285 over South River Trib in DeKalb County, Georgia. It was built in 1967 and reconstructed in 1983, so it is 58 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 98,600 vehicles a day, roughly 1% of them trucks, projected to reach 157,785 by 2031. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesI-285
CrossesSouth River Trib
Location9.5 MI S of Decatur
RouteInterstate 285
StateGeorgia
Coordinates33.67223, -84.33024
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length28 ft (8.5 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98,600 (2024)
Projected traffic157,785 by 2031
Trucks1%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$477,000
NavigationNo navigation control on waterway

Frequently asked questions

When was I-285 over South River Trib built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1983.

What condition is I-285 over South River Trib 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 Trib carry?

About 98,600 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is I-285 over South River Trib?

The structure is 28 ft (8.5 m) long with a longest span of 14 ft (4.3 m).

Who owns I-285 over South River Trib?

It is owned by the State Highway Agency.