Sweetwater Creek (Chattahoochee River tributary)

It is a tributary of the Chattahoochee River, and near its end it is the centerpiece of Sweetwater Creek State Park.

[2] Since 1904 there has been a stream gauge near Austell (actually in Lithia Springs), at latitude 33°46'22"N, longitude 84°36'53"W. The watershed area above this point is 246 square miles (640 km2).

In late September 2009, the worst flooding ever occurred on the creek, after days of heavy rain.

New records were set, and many roads were left underwater by it, including Interstate 20, which was closed west of I-285 for nearly three days.

The National Weather Service said the chances of having more than 10 inches (25 cm) of rain in a 24-hour period were less than 0.01% per year, making it a 10,000-year event.