wes,why would you put the silt over the rock formations?i would think that the formations would make excellent cover.as for being bad,in may case yes.where the average depth in the past was 8 to 10 feet the lake has silted in to a point that the average depth on one end is now 3 to 4 feet.thru time if you allow the silt to continue,you will lose that 12 foot depth. \:\(