I am in Beaverton, only a few miles from the transmitter sites for Portland area FM's so it is hard to DX anything at my location. When I lived in East Portland, I could get KUBE, KMPS, KING, KKWF, KPLZ, and KZOK. I doubt I could anymore with all of the new translators and stations on those frequencies now. I have never heard KISM in Portland.
It all depends on conditions...I have heard KPLZ south of Portland too, but not for a long time. There is also a translator in the Longview area now on 101.5.