Hara said:
My guess is if you got it off the side of the road, it is not a turtle but a terrapin.
Ah, the age-old nomenclature issue...
Understand that for most Americans, all fully aquatic (turtle/sea-turtle), semi-aquatic (terrapin), and many NA terrestrial (tortoise) chelonians are referred to as 'turtles', without the distinction that most Europeans and some North Americans make. There are very few mainly-aquatic FW turtles (such as softshells, some musk turtles) that rarely leave the water (for even basking) in the USA.
The species list she can choose from (for indigenous species) in her area are:
Common musk turtle (less likely)
Sternotherus odoratus
Northern redbellied cooter (endangered species)
Pseudemys rubriventris
Diamondback terrapin (threatened)
Malaclemmys terrapin
Painted turtle (common)
Chrysemys picta
Blanding turtle (threatened)
Emydoidea blandingii
Spotted turtle (common, and my bet)
Clemmys guttata
Wood turtle (fairly common)
Clemmys insculpta
Bog turtle (threatened)
Clemmys muhlenbergii
Common snapping turtle (common, but unlikely)
Chelydra serpentina
And, of course, the ubiquitous red-eared slider, which would be an introduced species.