“Before I speak, I have something important to say” — Groucho Marx
Generic hatch charts suggest Green Drakes, small and large in size, start to hatch moderately when a stream tempetature reaches 52-54F (11-12C). The sweet spot is noted to be 54-58F (12-15C) for the most prolific hatches. Yet, there is one stream I fish where I see Drakes at 46F (8C). That’s several degrees cooler. I’ve noticed the key to the hatch on this specific flow is direct sunlight flooding the river bed/bottom. Once solar exposure happens it seems the nymphs are “ready to go”; ready to emerge. And it is not because the water temperature increased significantly in sunlight. On a sunny day I have seen it climb only 3 degrees by late afternoon.
So hatches can be river specific. This particular hatch appears synchronized to the valley’s lighting conditions once water temperatures pass 45F (around 8C). Once light floods the river I start looking for drifting Drakes and hopefully a response from the trout. Cloudy cooler days are never as good. Late afternoon mountain shadows seem to squelch the hatch. The trigger appears to be sunlight.
Speaking of hatches…there have been few dry fly opportunities this summer in my region, at least on the dozen or so rivers that I have visited. Bug life has been on the decline for years and this year it seems to have dropped off a cliff; it has “tanked” on most rivers…even on the generally reliable local tailwaters. Hopefully it will improve somewhat before the end of the season. If you are a visiting angler and want to be successful, you’ll have to be versatile in your angling methods.















































