The Reservoir Wall is a series of climbs mostly starting on a ledge halfway up the north wall. Trees above, water below. Hazards include falling trees and rocks, cliff jumpers, and killer geese defending their nests.
From the welcome sign, follow the wide right-hand trail downhill toward the reservoir. Follow the path left around the fence to the other side. Once there, follow the other side of the fence back to where it meets the a rock wall in the woods, next to the right-hand shore of the reservoir. Follow the wall left until you get to the ground-level climbs of the Reservoir Wall.
To reach the upper climbs, you'll climb most of Mya's Climb until you're level with the ledge. From there, traverse left along a ledge, high above the reservoir. A series of climbs start from this scenic perch.
Follow the path past the Lower Climbs on your left, along the reservoir to your right. Follow a side trail along the edge of reservoir, and take it through the woods to the north. You'll reach a wooden sign with a weathered topo of the Giant Wall. Just past it you'll find the real deal.
Philadelphia
For those who want specifics, it was just above and to the left of Mya's climb. Big chunk of rock (including some small trees) came loose seemingly out of nowhere. Dec 20, 2018