The Sierras are suffering from pine beetle infestation which is partially a result of the previous years of drought. The campground shown here has been forced to cut down hundreds of trees in what used to be a lush forest of pines and oaks.
Zoom in and scan side to side to get a better view.
I noticed a lot of dead pines in Yosemite. And elsewhere in Sierras you cant find any areas not affected. It really changes the landscape when our beloved trees are dying and can only be removed before they fall.