We are not 100% sure on this identification but believe this large, black wolf spider is Meloscosa fumosa, the only species of its genus. It fits the bill in terms of appearance and its subalpine habitat in the Rockies. This one was spotted in scree at Siyeh Pass in Glacier National Park at an elevation of 7900 feet. We did not come across a lot of information, but according to a 2010 news article from the University of Guelph in Guelph, Ontario, Canada, they are reportedly rare. Except for one genus (Sosippus), wolf spiders do not spin webs. They are fast, ground-dwellers that hunt down their prey.
Photo by Michael Wharton on 8/7/20 in Glacier National Park, MT