Yep. See big ones like that regularly. They are pretty cool. Saw 2 of them SLEEPING underwater last year. So strange. One of them lays eggs in my neighbor's garden. Same spot every year.
Plus my wife is on the Diamondback Terapin project in SE mASS. Trap, tag, release. She's the master trapper. Scoops em with a net from her kayak. Because turtles are smart - if they get caught in a trap once, they won't ever go in one again. It's only her swift net skills that give them already-tagged turtles to examine.