Landscapes & nature
Lewis and Clark National Forest
US national forest in west central Montana, from 1907 to 2015, first established in 1897 as Lewis and Clarke Forest Reserve
Wikipedia names Lewis and Clark National Forest as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Lewis and Clark National Forest. Each title’s page links to the sentence that says so.
Thunderbolt and LightfootCrime film1974