Just try to get a last minute camp spot on Memorial Day weekend most places.  We were fortunate to discover Butt Lake near Lake Almanor.  Only one small burn area far from the campgrounds.  Friday was opening day for Cool Springs campground.  A PG&E operated facility, it was in great shape and ready for the season.  We did three nights, departing on Monday.  On Friday night we were one of only a few guests.  Saturday and Sunday were full, but the feeling was vary spacious.  The lake is a reservoir with no actual inlet.  Rather it is fed by a pipe from Lake Almanor with a hydroelectric plant just prior to the water entering Butt Lake.  Oddly for a PG&E lake there is not hydroelectric plant at the outlet dam.  Did some bike riding to check out the dam, Ponderosa Flat campground, Pioneer cemetery, and east shore of the lake.