From what I can see, looks like you got a terrapin, or what we call locally a "box turtle"...I think you may be too far inland to get many true turtles there...I've caught a couple of these guys in my youth, & it's so cool that kiddo got to see a little bit of nature in action...
btw, terrapins have a worse track record of successful street crossing than even 'possums & armadillos

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