Where was Across the Wide Missouri filmed?

1951 film by William A. Wellman

Across the Wide Missouri (1951) was filmed in Rocky Mountains, Durango, Molas Pass and Durango Mountain Resort, 4 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as Colorado. Each place says where its claim comes from.

See them on the map → Wikipedia Source data

Places per Wikipedia's article

The Wikipedia article names 4 places. Each links to the sentence that says so.

Recorded only at country level

Also filmed in Colorado, but the exact places are not known, so they are not on the map.

Filming locations that are mapped there: United States

Also shot in these places