Missouri records
Diamondback Watersnake in Missouri
HarmlessNerodia rhombifer

Yes. The Diamondback Watersnake has been recorded in 23 Missouri counties. It is non-venomous (harmless). Heavy banded or blotched body, round pupils, and a narrow head — unlike the cottonmouth's broad, blocky head.
Missouri counties with Diamondback Watersnake records
23 listedSee the full Diamondback Watersnake profile or all snakes in Missouri.