This province is composed of the metropolitan, the Archdiocese of Portland in Oregon, along with its four suffragans: Baker (in Oregon), Boise City (in Idaho), Great Falls-Billings (Montana) and Helena (Montana).
Archbishop John George Vlazny (72) is the ordinary of the Archdiocese of Portland in Oregon. The archdiocese also has an auxiliary bishop: Bishop Kenneth Donald Steiner (73).
The Diocese of Baker is led by Bishop Robert Francis Vasa (58). His 10th anniversary of consecration as a bishop is in January. He is at an age and experience level that he might be considered for other posts. Curiously, his only predecessor that did that was the first, Bishop O'Reilly, who became the Bishop of Lincoln, Nebraska. That is also where Bishop Vasa served as a priest.
Bishop Michael Patrick Driscoll (70) is the leader of the Diocese of Boise City. He will celebrate 20 years as a bishop in March.
The Diocese of Great Falls-Billings is led by Bishop Michael William Warfel (61). He will celebrate 30 years as a priest in April.
Bishop George Leo Thomas (59) is the head of the Diocese of Helena. He also celebrates his 10th anniversary as a bishop in January.
Overall, it seems likely that this province will be quite stable in terms of its hierarchy for the next year or two. The one possible exception being Bishop Vasa as mentioned before.