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 one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
grew up in Lake city Colo on the VC Bar ranch.We had 3 1/2 miles of the Lake Fork of the Gunnison River running through it.Until I was old enough to work I would eat breakfast and head out on to the river and fish all day every day.