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 is probably Isoperla petersoni, a very common Perlodid stonely in Alaska streams.
This stonefly was collected from the Kwethluk River in Alaska on July 9th, 2010 and added to Troutnut.com by Bnewell on July 3rd, 2011.