Readers Write In: Is this a Kansas Cottonmouth?

This is what I saw when I was running tonight it was right by a pond. I think it may be a Water Moccasin but I'm pretty sure they're not common around here.

Jacob P.
Derby Kansas

Okay folks, I'm wondering if this will be a challenge for you all. Let's hear your identifications for this critter. There is a clue in the original note, it was found by a pond. Here's another clue: it is baby snake season and they're showing up everywhere. Is it a Cottonmouth? Why or why not?