Tis the season to be jolly, sfrom Montana to Oregon to Colorado the high water marks the onset of the large salmonfly and stonefly migration up the rivers. This makes all the hearts of many fly fisherman go piter patter. Hard to follow, hard to hit because you are dealing with high muddy run-off water.
Usually if yoy can find the good water and hatch the fishing is realatively easy and fly selection simple and BIG. Trout are hungry. Water is moving very fast and the window of opportunity is short. Trout are on the feed, and feeding fast.