This is been one of the better Julys that I have had the pleasure of guiding on Montana’s Rivers over the years. With a ton of water coming off the mountains, the river has held up wonderfully and fishing has been excellent from top to bottom on the Bitterroot river system. Big water does affect the bugs in weird ways where the hatches are actually not that prolific, though.
When you have a large amount of water coming down the drainage coupled with cooler temperatures, you will see a smattering of many different bugs hatching. On the contrary, low-water years with warmer temperatures will expose more bugs and one will see explosive hatches. The downfall of the low-water is that the hatch will run out of biomass quickly and be short-lived. Big water years you will see the hatches spread out over a longer period of time allowing you to fish a multitude of bugs with all the varied hatches going on at one time. Give any veteran river guide a choice, and I will take the big water hsnds down every time.