You are right about the New Plymouth Chapel. That is a new one to me. I might visit some time.
Heck, going to Idaho falls/American Falls from here, by the time I get to Boise it seems like I’m almost there!
Yes, Post Falls and Idaho Falls are diocese approved TLMs. New Plymouth is a SSPX chapel. I am active at both St. Paul’s in Nampa (N.O.) and the SSPX church, if you can believe that. I am working with a friend to write a brief letter to Bishop Driscoll, asking what is the process to get a TLM regularly celebrated in the Treasure Valley. Anyone want to sign on? When I’ve asked my priest about this before, his story is that there isn’t a TLM offered because, and I quote, there isn’t enough interest in the Valley.