Water snakes do an excellent job of looking like both copperheads and moccasins, but usually they copy the darker patterns. That picture shows a classic copperhead (or two) of the desert tan coloring. Copperheads usually live in dry places. However, the last time I saw a copperhead, it was right next to a lake, in the debris and logs that collect along the shore.
"We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin