Heaviest emergence I ever saw was a few years ago on a small Yellowstone trib. I had fished the same stream the previous year and had a blast catching a bunch of cutt-bows on a peacock foam-back Convertible. This time I barely got a sniff on the Convertible with all the spruce moths on the water (the few fish I caught looked like they had bellied up to the buffet more than once), and switching to a tan EHC didn't do a whole lot better; not sure if they were being picky or just had too much of a good thing, but I definitely want some of these (and Wally's Widow Spruce Moth) in the box next time.

Regards,
Scott