Posted 9/16/2020 08:04 (#8498458 - in reply to #8498176) Subject: RE: Idaho/ Montana State boundary
East Central Ia, S. Waterloo
Part of it is the continental divide. After that it looks like there are several stories of how it was determined but basically it follows the Bitteroot Mtns.. Just for the record, I only know that because I looked up, the border between Idaho-Montana. It was an interesting read.