Well done!
I don’t know the exact location and I’ve never been to that area, but from what I can find, that’s the right spot. They originally said it would be for the Schuylkill River and kept saying Philadelphia if that helps at all.
I’m from the middle of Mass, about 20 minutes north of the Connecticut line. I never knew rivers could reverse until this came up. When he originally said, “point in the direction of flow” I thought he meant sway a little with the currents not actually turn completely around. This is what I get for assuming haha
Griz