This cache is placed at the sculpture of two Blackfeet warriors located near the south boundary of the Blackfeet Nation. There are three others, where highways enter from the north, east, and west. It is also just south of the information sign noting this is the Minnie Spotted Wolf memorial highway. I'm not a tribal member but I have great respect for the native cultures of North America. I grew up on a Montana reservation, and my father was a physician who was well respected by the local tribes. He was made an honorary tribal member in 1968. 
You can read about the sculptures here https://visitmt.com/listing/blackfeet-warriors-sculpture-15143 and more about the artist, Jay Laber, here https://missoulacurrent.com/jay-laber/.
Despite the opportunities for a magnetic cache on these metal sculptures, this cache does not use a magnet. NOTE I have realized that if there is snow piled up everywhere, this may be difficult to find - might require some digging.