OK, so I went to fly today to a reservoir that I have flown before (36 24'24.80 N 118 59'47.80 W) called Lake Kaweah in CA. I checked my AirMap and I was OK by their info, but before I got off the ground a Sheriff stopped and told me that I could not fly over the lake. So I said OK and asked if he new why, told me to check the posted letter at the ranger station. So went back, took a picture of the letter, which I have posted. I can't find to much on the net about this so I thought I would ask you guys that have been doing this way longer than me. Also the lake is built by the Army Engineer Corps. Can you educate me.