B.C. hwy 97 south to S.E CA and S.W. AZ late Oct.

I just looked up Westbridge. That's just north of the Kettle Valley Prov Park, where I've lunched and camped a couple of times. Hwy 3 has some grades and curves that are comparable to US97, for example Anarchist Summit, Paulson Summit, and Kootenay Pass.