Recent droughts (1999-2001, 2007) have focused attention on stream flow in the upper Chattahoochee (regulated) and Flint Rivers (largely unregulated) of the metro Atlanta area of North Georgia. Using long-term U.S. Geological Survey data from the Chattahoochee River (Buford Dam and Whitesburg stations) and Flint River (Carsonville station), changes in hydrology were determined. The Chattahoochee is a major water supply for Metro Atlanta. Chattahoochee River average annual discharge did not change following the construction of the Buford Dam. However, monthly 50 percentile flows were substantially altered, decreasing during late winter and spring and increasing from late summer through fall. Also, some of the lowest annual flows of record were observed during the droughts of the 1980’s and 1990’s. In the Flint River a slight declining trend was observed in annual flows over the period of record. Water extraction in the upper Flint tends to support off-channel reservoirs and storage.  Monthly 50 percentile flows were diminished from January through October. No long-term changes in annual regional rainfall were detected. These results indicate that forms of water supply development have substantially differing impacts on the hydrologic regime of rivers and should be accounted for in regional planning.