Structure 8901540 · DeKalb County, GA

Columbia Drive over I-285 (sr 407)

Carries Columbia Drive over I-285 (sr 407), 8.5 Mi SE Of Decatur.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT300 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

300 ft end to end, longest span 83 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built196759 years old
Length299.9 ft91.4 m
Daily traffic10,100counted 2024
Last inspectedMarch 2024every 24 months

Location

StateGeorgia
CountyDeKalb
Location8.5 Mi SE Of Decatur
CarriesColumbia Drive
CrossesI-285 (sr 407)
Coordinates33.70174, -84.25217

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length299.9 ft (91.4 m)
Max Span83.0 ft (25.3 m)
Deck Width34.4 ft (10.5 m)
Deck Area959.7 sq m
Main Spans4
Year Built1967

Traffic

Avg Daily Traffic10,100 (2024)
Truck Traffic4%
Lanes On Bridge2
Lanes Under Bridge8

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000008901540

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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