Harmless water snake. Also an expert baby trout fisherman.
Sadly, these beneficial snakes are often killed by people who can't tell the difference between the harmless water snake and the venomous Cottonmouth. The Cottonmouth has slit-type pupils like a cat. This harmless water snake has round pupils. So, all you have to do is get close enough to see what kind of pupil the snake has and you too can tell a venemous snake from a harmless one. LOL