This morning, after an unpleasant interaction with Philadelphia City Recreation Department employees at a pool where I had intended to go swimming (not relevant, except that I felt pissed off and needed a herping fix), I rode up MLK Drive to the Falls Bridge to check below for turtles.
I had seen red-eared sliders (Trachemys scripta elegans) basking down there before, and this time I saw some more turtles - one of which was surely a slider, and a few of which just might have been map turtles (Graptemys geographica). Maybe that's wishful thinking, but I think worth an empirical test of my own sometime in the future.
On my way back home, I decided to check out a rocky area around the railroad bridges just downstream from the Roosevelt Boulevard bridge. I saw a small, juvenile turtle basking that dove, but a bigger turtle just sat there in a rocky shallow spot right next to a pileon by the bank. So I waded over and picked her up. (please excuse the slightly crappy phone camera shot)

This turtle gave me the impression of being really old. She also smelled kind of funky - I'm wondering if she was under the weather, explaining her complacency as I approached to pick her up.
I guess I should be upset about her being an invasive species (we should be having red-bellies - Pseudemys rubriventris - basking down there), but it worked as a herping fix and made me feel less pissed off about the crappy customer service Philadelphians have to deal with from our public servants (I write that as a federal public servant who takes customer service seriously - enough ranting). Stay tuned for more Schuylkill turtling!