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Thamnophis sp.
Black with white/yellow stripe down his back and side marks of the same color. About the size of a quarter in diameter, bigger than two feet long
Off paved path of urban forest nature park in PNW
Do garter snakes come in all colors??
This looks like one of the garter snakes (Thamnophis sp. http://www.californiaherps.com/noncal/no... ). There are about four species in your area. They can be extremely variable in color and pattern: solid, striped, speckled, checkered or a combination of these.