15-35 inches. Pale gray or tan above with three broad, dark brown or black longitudinal stripes and a dark band through the eye; underside dark reddish brown with a central row of pale spots. The keeled scales are in 21 rows.
Salt marsh snakes occur in open brackish and salt marshes. They give birth to 3-19 young.
Coastal mashes including the north shore of Lake Pontchartrain.