Don't be too concerned. The Google maps are created by layers of photos taken at different resolutions and focus points over a long period time.(This is what allows you to ZOOM In and Out and the picture refocuses each time). What you see could have been a colored runoff during a heavy rain storm that was taking place when that particular set of photos was taken. I am sure any leak that would show on Google would have long ago been resolved.
If you look around at different lakes and different elevations you will see where the sun is shining on the water in one section of the picture but not in the one next to it.
John K Fontenot-
The greatest joy in a parent's life is to see his sons grow into really good bass anglers.