This is the largest "common snapping turtle" I have encountered, ever.
In this image, the body is visible beneath the water. Most of the voters know what they were seeing.
My first thought was a beaver that got hit with an ugly stick, but those eyes are a give away. Was very near a beaver lodge and had seen some fresh timber falls. The neck on that thing is huge, got a fleeting glimps.
Here is another snapping turtle captured on the same day but different body of water. They do not sun themselves near as much as other turtles do.
Here is an image copied from DailyMail.com. The poor guy moved in for the kiss without permission.