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I see why you think it is a chipmunk but the length of it's tail and its overall shape, but don't they normally have stripes?
This is a Californian ground squirrel (Otospermophilus beecheyi), a relative of the chipmunk. Note the mottled fur - grey, brown, reddish colours - and the pale ring around the eye.
These are fairly common throughout the Western USA.
If you want to put up an identification I'll agree to it.
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