Further reading. Graham's crayfish snake is a medium-sized, dull-colored, semiaquatic snake known from prairie streams, marshes, and ponds. There are no subspecies of Graham's crayfish snake, Regina grahamii, which are recognized. External links. Geographic range. Graham's Crayfish Snake on Reptiles and Amphibians of Iowa. They are semi-aquatic, living in lakes, ponds and slow-moving waters with abundant crayfish populations.They can also be found in urban areas. R. grahamii is found in Arkansas, Illinois, Iowa, Kansas, Louisiana, Mississippi, Missouri, Nebraska, Oklahoma, and Texas. Baird, S.F., and C. Girard (1853). Graham’s crayfish snakes can be found throughout Central Oklahoma and in the Red River drainage. References. There may be a faint tan stripe along the middle of the back. The ground color is brown or yellowish brown above, with yellowish-tan stripes along the sides. Find local businesses, view maps and get driving directions in Google Maps.