Martinlf on May 18, 2012May 18th, 2012, 6:39 pm EDT
The wings look clear enough, and the body dark enough this seems like a spinner to me. Great photo on this one and on the baetis posted the same time. Ah, yes, I see the other photos of thing bug labeled as spinners look the same.
"He spread them a yard and a half. 'And every one that got away is this big.'"