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.
Over the many years I found Caucci & Natasi's Mayfly Pocket Guide the best quick, visual reference for me on stream and off.
Although blurry you will see the short stocky spinner I have never seen before on this river.
Can't see it very well, but my impression is that it looks so stocky because a major portion of the abdomen is missing.