Swimmers sits about four miles into the Lower Youghiogheny run through Ohiopyle, right below the Dimple ledge, and it's earned a reputation as one of the better-known playholes in the eastern US. It forms just past the river bend, and at the right gauge reading — roughly 4 to 5 feet at Ohiopyle — it turns into a genuinely fun little surf wave. Push much higher than that and it washes out into a pushier, hole-riddled mess, so timing matters. Stay centered on your approach, too; there's a nasty hole lurking river right that's bounced more than a few surfers out of their line.