The Canadian River basin in Norman, Oklahoma supports a strong population of diamondback watersnakes -- or, at least, it did. I haven't been back since 2007 and I know there's been continued development in that area. When I was a kid in the 1980s, they were highly abundant. In the mid-2000s they were still present, but less common in their old haunts, likely because of residential development pushing in from both the south and the north.
~ janson jones,
http://dusttracks.com
The Diamondback Water Snake (Nerodia rhombifer) is a common species of water snake found throughout much of the central United States and northern Mexico. It is non-venomous and a member of the colubrid family. There are three recognized subspecies of N. rhombifer. The species was first described as Tropidonotus rhombifera by Edward Hallowell in 1852.
