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USGS Georgia Water Science Center: Chattahoochee River BacteriAlert


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 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
05/23
5:15 AM EST
3 25 Currently, there is not a National Park Service health advisory in effect
The last E.coli water sample was taken on Thursday 05/21 at 1:15 PM Eastern Standard Time. At that time, the measured E. coli count was 24

Chattahoochee River at Paces Ferry Road


Most recent turbidityEstimated E. coli count *National Park Service health advisory statement *
DateTurbidity, in NTU
05/23
5:45 AM EST
10 117 Currently, there is not a National Park Service health advisory in effect
The last E.coli water sample was taken on Thursday 05/21 at 9:10 AM Eastern Standard Time. At that time, the measured E. coli count was 230

* 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: Medlock Bridge | Paces Ferry

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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