I probably should add that collecting macro's is MUCH
easier with two (2) people; one holding the netting, and the other disturbing the stream bed... and an old garden pitchfork really helps with the latter.
I used to take my daughter with me and she would record the species as I removed them from the netting. Each scoop netted well over one hundred (100) specimens... and for your purposes you'll get some "bonus" species once in a while too (sculpins, crayfish, madtoms, etc.).
My daughter hard at work trying to keep up, "BAETIS, CORNUTA, HYDRO, CORNUTA, INVARIA,..."
Here's your dragonfly nymph
Stonefly nymphs are all very cool looking
March Brown... quite the oddity from this particular stream
Depending on your timing, you may even get some hatching right in the net