Spent a couple days on a tailwater in MT. Most hatches, caddis, PMD were pretty much non-factors but the tricos were doing there thing in massive numbers; however, the fish (of which there were many) didn't seem interested at all. Fished a few runs where I had seen very heavy feeding last July, but except for the odd, splashy rise to something else (beetle?, ant?, unknown?) the fish ignored the hatch and spinner-fall. It's been a hot, dry summer out here and flows are down (temps still seemed reasonable), but the protein is still on the table and the fish don't have to expend any more energy than they did before. I've seen trout ignore spruce moth falls and salmonflies because they're stuffed to the gills with them; do the get tired of day-after-day of these little bugs?