The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Millcreek on Feb 21, 2019February 21st, 2019, 2:00 pm EST
August - Might be an Isoperla. They're usually pretty distinctively marked but some aren't. Here's a link to one that looks similar. https://bugguide.net/node/view/594434/bgpage
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Creno on Feb 21, 2019February 21st, 2019, 3:09 pm EST
Another good place to look for determined images of immature aquatic insects is Bob Henricks pages - https://www.instagram.com/buddhabob2hanlubo/ and aquaticinsectsofcentralvirginia.blogspot.com