I would not get any closer. The pattern looks very similar to Rattlesnakes found in Oregon. Rattlesnakes can loose their rattles, they can break off.
http://www.examiner.com/oregon-nature-in-portland/rattle-snakes-of-oregonpicture?slide=9828206#slide=9828211
Here is the link for pics of a Rattlesnake in your area.
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