Where was Thunderbolt and Lightfoot filmed?

1974 film by Michael Cimino

Thunderbolt and Lightfoot (1974) was filmed in Great Falls, Choteau, Fort Benton, Hobson, Ulm, Augusta and 2 more places, 8 places named in its Wikipedia article, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data