Yes we were out Monday as well and the hatch is starting for sure. the worse part of the hatch is they smell like rotten fish when they die so cleaning up after them can be a stinky and messy job. When I was a kid and yes that was a really long time ago we had a really bad summer in PC, the mayflies were so thick they brought in scoop shovel tractors to scoop them off the roads. They were blocking the radiators in cars causing them to overheat and really stink. My dad said it was like driving on ice from the mashed bugs on the road. I can remember seeing dump trucks hauling loads of them to the dump. I have been fising the lake in this area much of my life and yes the hatch definitely slows down the catch rate of the fisherman, in some years I just keep the boat in the barn and wait until it passes, not worth the gas in bad years.