Trout fly hatch?

[jbaldwinblkft]

Yeah, I haven't heard of big time hatches on the main stem either. However, one time I was bank fishing downstream a way from Blackfoot. I had caught a few small rainbows on a pt nymph when I sensed some movement across the underside bill of my hat. I was somewhat startled and I peeled my hat off and saw that it was a salmon fly, or some other kind of plecoptera. My first thought was to catch it for my insect collection (I'm a science teacher), but before I could take action it laboriously fluttered way. It slowly flew straight up in the air, it's big wings glittering, then dropped at a steep angle and landed on the water. Almost immediately the fish moved in and after about three or four boiling rolls the insect was taken. Right away I searched the flybox and came up with something kind of like it, and tied on a big foam version of what I thought it might be. No go though. It just didn't have whatever they were looking for (or I'm sure I wasn't presenting it well enough), anyhow I've wondered about it and thought that it might be something I ought to research.
Anyone else use them on the main stem of the Snake?