Found this not too long ago and thought it might prove helpful for anyone wanting to know the current water levels of 119 popular Texas lakes. As much as some of our lakes fluctuate it can prove quite helpful. I use it combined with Google Earth to give me some idea of what to look for on any given lake before I ever leave the house. Hope it proves as helpful to you as it does me.
If you don't live in Texas you might check to see if your state offers something similar.
Ben
http://wiid.twdb.state.tx.us/ims/resinfo/BushButton/lakeStatus.asp?selcat=3&slbasin=39