These species all have some sort of dorsal (middle of the back) striping, even though they might also have a pattern.  This striping will run from head to tail and may be strongly marked or faint and hard to detect. Click on the image to learn more about each one.
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Common gartersnake

DeKay's brownsnake

Graham's crayfish snake

Lined snake

Marcy's checkered gartersnake

Northern red-bellied snake

Plains gartersnake

Timber rattlesnake

Variable groundsnake

Western pygmy rattlesnake

Western ribbonsnake

Western smooth earthsnake