The general guides that I've seen are useful only in the sense of narrowing down what might possibly hatch in a given area at that time.
Beyond that, there is so much variation that I'm not sure they are of any use at all. For example, three of the main rivers that I fish are separated by no more than 20 miles, but they have 3 completely different hatch patterns such that the general hatch chart for the area is never right for all 3 rivers throughout the year.
For example, one river is a tailwater, so the main hatch for April on the general hatch chart is the BWO. Which occurs on this river not at all in April and only occasionally in May. But by then, it's a rarity on the other rivers in the area.
Whereas the black caddis hatch first appears on the chart for mid May. Well, that's generally correct, except on spring creeks when it comes in early to mid-April and then it's done by the time the general hatch chart says it should be happening.
So personally I don't find them to be very useful because weather and water conditions add so much variation. The only way I can see a chart being of any real use is the occasional charts you see for places like Henry's Fork, where they chart the hatches for specific sections based on daily observations taken over many years.
Grouse
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