How to Identify the Concho Water Snake (Identification Guide)
Recognize the Concho Water Snake by its narrow dark crossbands on a pale body and its very limited range along central Texas rivers.
Read the full Concho Water Snake encyclopedia entry →
Key identifying features
The Concho Water Snake (Nerodia paucimaculata) is a small to moderate-sized water snake identified by narrow, well-spaced dark crossbands or blotches on a pale gray to tan background, combined with an extremely limited natural range confined to a short stretch of central Texas river systems.
Coloration & pattern
The back typically shows a series of relatively narrow, dark brown or gray-brown crossbands or blotches spaced somewhat evenly along the body, set against a pale gray, tan, or light brown background. Compared to some related water snakes, the pattern tends to look cleaner and less busy, with fewer secondary markings between the main bands. The belly is pale, often cream or light gray, sometimes with faint dark spotting.
Head, eyes & scales
The head is moderately broad, typical of water snakes, colored similarly to the body. Eyes sit relatively high on the head with round pupils. Scales are keeled, giving the body a rough texture.
Size & body shape
Adults are relatively modest in size, typically 15 to 25 inches (38-64 cm), with a moderately slender to average build and a short tapering tail.
Range & habitat where you'll see it
This species has one of the most restricted natural ranges of any North American snake, historically limited to a short section of the Concho and Colorado Rivers in central Texas, associated with rocky riffles and shallow, clear-flowing sections of river. Because of this extremely narrow range, geography alone is a strong identification clue.
How to tell it apart from look-alikes
Its pattern is broadly similar to other banded water snakes in the region, including the closely related Brazos Water Snake, making its highly restricted range along the Concho and Colorado Rivers in central Texas one of the most reliable identification aids. Comparing the spacing and cleanness of the crossbands with regional field guides for these two closely related, geographically restricted species can help refine identification.
Frequently asked questions
What makes the Concho Water Snake identifiable despite similar-looking relatives?
Its extremely restricted natural range, historically limited to a short section of the Concho and Colorado Rivers in central Texas.
What does the pattern on this snake look like?
Narrow, evenly spaced dark crossbands or blotches on a pale gray to tan background, with a relatively clean overall look.
How large does this snake grow?
It is a relatively small water snake, typically 15 to 25 inches in total length.
How does it compare to the Brazos Water Snake?
The two are closely related and pattern-similar, but the Concho Water Snake occupies a different, non-overlapping stretch of central Texas rivers.
Is the Concho Water Snake venomous?
No, it is nonvenomous and harmless to humans.