I imagine so =D
You should always double-check when in new chinese restaurants, especially if they're not in your generally-considered normal vicinity.
For example, lo mein exists in Mammoth Mountain, CA! =O It was very shocking, so I ordered it posthaste, without asking if it was, in point of fact, the noodle dish.
It was stuffed mushrooms ><;; *shuuudder* I imagine that particular venue was on some sort of Chinese Food Hallucinogen or something, because... well come on. Stuffed mushrooms. Lo mein. Makes No~ sense o__O;
As far as I know, Oregon has chow mein, not lo mein, but again, double-checking is always a good idea. Plus, most menus list lo/chow mein under "noodles" or "noodles & rice" on the menu, which is a generally foolproof way if you're afraid of the waitperson =D