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.
This spinner came from one of those huge swarms that make one just stop fishing and admire the spectacle. Not bad for a little-known species.
In the same swarm I collected a female and another male.
This mayfly was collected from Mystery Creek #249 in Washington on July 4th, 2020 and added to Troutnut.com by Troutnut on July 12th, 2020.