Mike, the trout in Penns very often sit in the slow water on the banks like that. Especially on the outside bend of a curve, they usually move in during the afternoon for a dun hatch. The current sweeps bugs into the bank where they get caught in the slower water among the rocks. Each rock funnels current around it, meaning bugs from 2 or 3 feet of stream width get get fed over a single point, off the tip of each rock. Aggressively feeding fish will sit off the point in that current and feed consistently. More often, they'll sit behind the rock a while, then move into feeding position and rise 3 or 4 times quickly, then slide back in behind the rock and rest for 5 or 10 minutes, repeat for several hours. I've seen it 100 times there, you can set your watch by it. Feeding behavior more than cover, they're not there when nothing's hatching, they're out in the middle.
I look for it. You don't even see the rises unless you are staring at that spot. Often there's no ring, just a beak or a tail fin you see, maybe a wake. People walk by and say they haven't seen a rise all day when you have 9 or 10 of them working the bank in front of you, just nod and say yep. If you see it once from a distance you get into position, and then stare at that rock till he decides to start again, don't get distracted by the one 15 feet up, he'll get his turn. I usually cast on shore from above and twitch it back into the slow water in front of the rock, and let it float down around. Most of my bigger Penns fish have come doing this.
Then at dusk they all move out into the main current for bug soup.
