Diamondback Water Snake (Nerodia rhombifer) - Threatened

Description: 30 - 48 inches. Diamondback Water Snakes are yellow or green colored with a series of dark chain-like markings that may make the lighter colored areas on the back appear diamond-shaped. The belly is light yellow and marked with black or dark brown spots.

Similar Species: Northern Water Snakes and young Copperbelly Water Snakes have dark bands across the neck. Adult Copperbelly Water Snakes are generally patternless, and darker colored.

Age in years of Most Recent Record
75+ 70 65 60 55 50 45 40 35 30 25 20 15 10 5

This map is generated from data provided by the Drake University Biodiversity Center, observations from HerpMapper.org, the Iowa DNR Natural Areas Inventory, as well as other sources. Please help us keep it up to date by reporting your sightings to HerpMapper.