A bit off topic, but FYI since you’re moving there. There is an FSSP Catholic Church offering daily Latin Mass (EF), under the authority of the Bishop of Boise, Idaho, in Couer D’Alene, just over the state line from Spokane on highway 90.
I’ve also heard there are EF masses around town in Spokane, but I’m not sure it’s true, I never found one. The Cathedral is attractive and sometimes Mass is chanted. Of course the Jesuits are also quite a presence with Gonzaga and St. Aloysius and a community there. Spokane Valley has a small but well-established Byzantine Rite Catholic Church which is very nice.
With all these diverse Catholic “groups” I’m sure if you ask around they will know if Opus Dei is in town. I am under the impression they would not go so far west away from their other hubs, into an area with such competition. I mean, honestly, you’ve got the Jesuits, the Trads, the regular diocese, the SSPX, that other weird group at St Michael’s, many Catholics and psuedo-Catholics. Plus it’s the See of the bishop. Sounds like a town for Opus Dei to avoid, there ain’t enough room for them. And this with Spokane population only 15% Catholic.
Note there are many regular NO Catholic parishes, along with the FSSP for EF, as distinguished from some sedavacantists groups that have congregated in Spokane for decades. Avoid these, such as the SSPX chapel, why go there when you have FSSP in union, 5 minutes down the road?