Illinois records
Diamondback Watersnake in Illinois
HarmlessNerodia rhombifer
Yes. The Diamondback Watersnake has been recorded in 20 Illinois counties. It is non-venomous (harmless). Heavy banded or blotched body, round pupils, and a narrow head — unlike the cottonmouth's broad, blocky head.
Illinois counties with Diamondback Watersnake records
20 listedSee the full Diamondback Watersnake profile or all snakes in Illinois.