We were just at Lake Powell from Friday to Wednesday. The biting dog flies are terrible. Like terrible. I have never seen flies like this at Lake Powell in the past 13 years of going. Each passing day of camping is worse than the 1st as they apparently realize you are there. In an effort to help others out, bring some bug deterant wafers (non flammable recommended) etc. Nothing like waking up in the morning covered in a fly horde. Bug spray was working well, but wish I had several of those BBQ area bug things to place around the boat, the trash, and the cook area.