The USGS Georgia Water Science Center maintains a map of real-time streamflow in Georgia. The monitoring station closest to our area is number 02336240 "S.F. PEACHTREE CREEK JOHNSON RD," located just on the other side of Emory campus. You can zoom into the map and click on that station for detailed graphs. There is also a ton of other general info, e.g., on what is meant by "100 year flood".
http://ga.water.usgs.gov/flooding-sept09.html