US Bridges

Flat Shoals Road over Cobbs Creek

Fair

DeKalb County, Georgia · 6.5 MI SE of Decatur · Structure no. 000000008900410

Built
1984
41 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
200 ft
5 main spans
Daily traffic
31,400
2024 count
Owner
State
State Highway Agency

About this bridge

Flat Shoals Road over Cobbs Creek is a prestressed concrete stringer/multi-beam or girder carrying Flat Shoals Road over Cobbs Creek in DeKalb County, Georgia. It was built in 1984, so it is 41 years old, younger 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 31,400 vehicles a day, roughly 1% of them trucks, projected to reach 50,250 by 2031. The structure is 200 ft (61 m) long and 84 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFlat Shoals Road
CrossesCobbs Creek
Location6.5 MI SE of Decatur
RouteState Highway 155
StateGeorgia
Coordinates33.68372, -84.24881
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.9 US tons
Inventory rating35.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length200 ft (61 m)
Longest span40 ft (12.2 m)
Deck width84 ft (25.6 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,400 (2024)
Projected traffic50,250 by 2031
Trucks1%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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$2.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Flat Shoals Road over Cobbs Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Flat Shoals Road over Cobbs Creek 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 March 2024.

How much traffic does Flat Shoals Road over Cobbs Creek carry?

About 31,400 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Flat Shoals Road over Cobbs Creek?

The structure is 200 ft (61 m) long with a longest span of 40 ft (12.2 m) and a deck 84 ft wide.

Who owns Flat Shoals Road over Cobbs Creek?

It is owned by the State Highway Agency.