This past September I pulled into the Lower Gray Canyon campground on a Saturday, hoping there would be an available spot. There wasn't. The place was packed. So onward to Plan B.
Yesterday, a Monday, I went to Lower Gray Canyon again and no one else was there. Just me. Sweet. Others showed up in the late afternoon and early evening, but I had already snagged the best spot. Off in a corner, right by the river, with no other campsites on either side of mine.