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Taricha granulosa
Cool find Andrew! Newts are adorable and this one is very lovely colors! I had to remove my ID suggestion because there are two species that look similar. I think this might actually be a Rough-skinned Newt, Taricha granulosa
http://www.californiaherps.com/salamande...
But you can compare to the Red-bellied Newt, Taricha rivularis http://www.californiaherps.com/salamande...