Medium-large turtle seen sitting on rock in middle of the river (quite shallow and slow-flowing at present). Seen from river bank, maybe 10 m away, through binoculars, for 1-2 minutes before the turtle dropped into the water. Turtle was overall dark brown in colour, except for orange colouration below (on legs and neck). Head appeared dark brown and lacked prominent yellow stripes of painted turtle, which I commonly see at this site (though not in the river). Also, the coloration on the underparts was distinctly orange, not red. Head appeared dark brown, and shell appeared uniformly dark brown/grey as well. Shell also seemed a bit more peaked than I'm used to seeing in painted turtle, but I did not view it well enough to confirm a shape difference. Size was quite large - at the upper end of the range I commonly see in painted (less than a foot long, but not by much). After seeing this turtle I was unsure to the identification and emailed a colleague who studies herps for input as to whether a snapping turtle could show orange below. She suggested that I look up wood turtle, which I am not familiar with, and the pictures matched pretty much exactly what I saw. That said, my observation was brief and I still feel that I could be wrong. Unfortunately, I did not get a photo or other documentation as the turtle dropped into the water soon after I first saw it. I walk through this preserve regularly and will watch for the species again.
Gall on red oak leaf. With tiny naturalist.
Or possibly grey