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.
I found this specimen and saw a few more of its kind during midday on a small, steep, rocky creek fairly high in the Cascades, different from the previously reported habitats of its species.
This mayfly was collected from Mystery Creek #249 in Washington on September 29th, 2020 and added to Troutnut.com by Troutnut on November 10th, 2020.