The United States Geological Survey pays keen attention to a number of physical processes around the country, and they are no less vigilant in their efforts to study water resources. Visitors to this site will first notice the map of real-time streamflow activity right in the middle of the homepage. The data is organized into seven percentile classes that draw on historical data to illustrate how the current streamflow activity compares to activity in the past. Using a series of drop-down menus on the top allows users to look for current flood and drought watches and also access historical maps and graphs that offer some perspective on monthly streamflow. Finally, the site also contains a thorough explanation of streamflow data and how such data is compiled and analyzed.