Take a deep breath, DL. I think your visitor was a Northern Water Snake, not a Copperhead. Water snakes are heavy-bodied, and often get accused of being venomous, but they aren't (around here, they are often mistaken for Water Moccasins/Cottonmouths). The most obvious difference is the marks across the back; on a Copperhead, they are narrow across the spine and wider on the sides ("dumbell shaped"). The snake in your picture has bands too close together for a Copperhead, and the bands are wider across the spine, narrower on the sides.

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