As part of the SCRIBES ON SCREEN series:

A River Runs Through It (1992) 123 min.

Summary from IMDB.com:

The Maclean brothers, Paul and Norman, live a relatively idyllic life in rural Montana, spending much of their time fly fishing. The sons of a minister, the boys eventually part company when Norman moves east to attend college, leaving his rebellious brother to find trouble back home. When Norman finally returns, the siblings resume their fishing outings, and assess both where they've been and where they're going.

BE ADVISED -- this film is Rated PG, with smoking, Prohibition-Era drinking, profanity, a brief moment of nudity, some brawling, a bad end for one character, a glorious foxtrot and sublime moments of fly-casting without any fish being injured.