2017-6-20 - juv. Northern Watersnake (Nerodia sipedon sipedon) 12-15" by David, D&M MD - in the driveway

This was a challenge to ID. The above is a comparison I pasted together from David's photo and one from:
https://www.marylandbiodiversity.com/viewSpecies.php?species=878
I also darkened and added some contrast to David's photo. If you zoom in on that you'll see the reddish scales on the side, common to this snake.