I was pretty far up the river yesterday (elev. ~2300) and spotted a bunch of insect activity. Yellow Sallies, size 14 tan caddis, and what I think were PEDs were out and about. I also found a few of these guys: I also spotted a couple dozen large mayflies, maybe size 8-10, brown color with 2 tails (or a very small middle tail not visible from 3 feet) each split 45 degrees off midline. The tails were about 1.5-2x the length of the body. They were flittering 6-15 feet above the stream, never landing on anything and always remaining out of reach. I started noticing them about 6:30 and the hatch increased until we left around 7:30. Any guess on what they could have been?