I was told by a Corps gate attendant the annual pass also included the use of a non occupied campsite to clean fish, picnic etc. as long as it was not an overnight stay and all trash etc. was cleaned up prior to leaving the campsite. I have seen a lot of people using the campsites after they came off the lake to clean their fish and then take them back to the lake to discard the remains but I don't see this in the Corps regulations.