Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This spinner appeared inside our car after a rest stop overlooking the Snake, so that's most likely where it came from. Two different keys place it firmly in Epeorus albertae.
This mayfly was collected from the Snake River in Idaho on August 23rd, 2020 and added to Troutnut.com by Troutnut on September 18th, 2020.