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USGS Georgia Water Science Center: Chattahoochee River BacteriAlert


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Chattahoochee River BacteriAlert Program

Background:   How safe is it to swim, wade, and boat in the Chattahoochee River today? For a highly urbanized river such as the Chattahoochee, much of the answer depends on bacteria levels in the water. This website provides recent E. coli bacteria counts and National Park Service health advisories for two locations (Medlock Bridge site and Paces Ferry site) on the Chattahoochee River (view map).

Important note:E. coli predictions and prediction intervals are inaccurate when water released from Buford Dam exceeds 2,500 cubic feet per second for periods longer than 4 hours.

E. coli bacteria counts and National Park Service health advisories for the Chattahoochee River

Chattahoochee River at Medlock Bridge Road


Most recent turbidityEstimated E. coli count *National Park Service health advisory statement *
DateTurbidity, in NTU
10/23
1:15 AM EST
14 173 Currently, there is not a National Park Service health advisory in effect

The last E.coli water sample was taken on Thursday 10/16 at 11:51 AM Eastern Standard Time. At that time, the measured E. coli count was 520

Chattahoochee River at Paces Ferry Road


Most recent turbidityEstimated E. coli count *National Park Service health advisory statement *
DateTurbidity, in NTU
10/23
12:45 AM EST
15 187 Currently, there is not a National Park Service health advisory in effect

The last E.coli water sample was taken on Thursday 10/16 at 8:55 AM Eastern Standard Time. At that time, the measured E. coli count was 817

* National Park Service health advisories and estimated average E. coli counts are based on current turbidity values. Bacteria counts are in number of colonies per 100 milliliters (ml) of water.
Formulas used to compute estimated E. coli counts, using the most recent turbidity:
Medlock Bridge site:   2.71828182845904^(2.11262 + 1.15221*log(turbidity))
Paces Ferry site:   2.71828182845904^(2.11262 + 1.15221*log(turbidity))

Data tables E.coli data tables

Chattahoochee River real-time streamflow: Buford Dam | Medlock Bridge | Paces Ferry | Ga 280 | Fairburn

Understanding BacteriALERT data.Important concepts to understand:
Understanding data
Find out about the bacteria

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The Chattahoochee River BacteriALERT project is a partnership between the National Park Service, the Chattahoochee Riverkeeper, and the Cobb County Water System, and . Agencies and organizations playing a direct role in the Chattahoochee BacteriALERT are:
List of  agencies and organizations playing a direct role in the Chattahoochee Riverway BacteriALERT

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