Generate a concise, detailed and straightforward text focusing on the topics i will give you about the movie Thunderbolt and Lightfoot from 1974. I'm looking for a straightforward and non-flowery style in this article with minimal use of adjectives. Please use simple and easily understandable language throughout the article. Try to avoid repeating the term 1974 movie Thunderbolt and Lightfoot too often in your response. This is used for a middle part in our script. Cut out intro and outro and jump right into the given facts. Using the information provided, craft a narrative or response that begins with a general statement or an engaging opening sentence that does not include the name or title of the context in question. Here Are the facts :
 
1: Though filmed entirely in Montana, the story ranges into north Idaho on the Oregon border (at ~30 min.), on the Snake River in Hells Canyon. The original plan was to film there. To save money however it was decided early on to shift to the Missouri River near Helena (south of the Gates of the Mountains), with the Missouri standing in for the Snake.
2: According to "American Rebel: The Life of Clint Eastwood" (2009) by Marc Eliot, Hollywood talent agent Stanley Kamen gave the idea for this movie to Michael Cimino to write, on speculation, for Clint Eastwood in mind as a vehicle for him.
3: That the film comes across as a "modern western" is no accident. According to a Malpaso Company representative at the time, the original plan was to film a more-or-less classic western. The setting was modernized "after the Montana shooting scene was studied".


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