I found an excellent link for a "departure from normal" precipitation map. It is quite telling to look at the TFF area, all the way back to 2005. To use this as a yearly departure from normal, under "1 Timeframe" at the left on the bottom, click "Archive: Month/Year". Under "2 Product" at the bottom center, click, "Departure from Normal". Then under "1 Timeframe", select a previous year. In the "Month" combo, click "FULL YEAR". You can click on a region to zoom the map. Quite a shock as to how really low the area right around the flowage has been all the way back to 2005.

http://water.weather.gov/precip/