There's a picture on the web taken by the pilot of a passenger jet a few days ago, I can't locate it right now. It was taken from cruise altitude and shows the entire lake looking north from Greenville, multiple cracks are clearly visible. One prominant crack extends from the north end of Deer Island past Sandbar and parallel to the Rockwood shore. As woodchip said, strong shifting winds this year probably contributed to the number and location. You never know though, if a cold blast comes through some may freeze closed and stay that way for the season. Be safe guys.