Structure 8900650 · DeKalb County, GA

I-85 over N F Ptree Cr- 2 U-turns

Carries I-85 over N F Ptree Cr- 2 U-turns, 3 Mi S Of Chamblee.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT381 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

381 ft end to end, longest span 142 ft: about 5 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.

Built198046 years old
Length380.9 ft116.1 m
Daily traffic206,000counted 2024
Last inspectedJune 2024every 24 months

Location

StateGeorgia
CountyDeKalb
Location3 Mi S Of Chamblee
CarriesI-85
CrossesN F Ptree Cr- 2 U-turns
Coordinates33.84950, -84.30320

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length380.9 ft (116.1 m)
Max Span142.1 ft (43.3 m)
Deck Width170.9 ft (52.1 m)
Deck Area6048.8 sq m
Main Spans3
Year Built1980

Traffic

Avg Daily Traffic206,000 (2024)
Truck Traffic1%
Lanes On Bridge12
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000008900650

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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