The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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.