This is the range map for douglasii based on information in the Helgen et al. 2009 paper in Journal of Mammalogy that revised a bunch of the ground squirrels.
https://www.researchgate.net/publication/375521118_Otospermophilus_douglasii_Rodentia_Sciuridae
To my knowledge, all of your Otospermophilus in Oregon would be douglasii.