Savage Water

Savage Water is a 1979 American thriller horror film co-produced and directed by Paul W. Kener and written by Kipp Boden. It stars Bridget Agnew, Ron Berger, Gil Van Waggoner, Pat Comer, Dewa DeAnne, Gene Eubanks, Kener, and Clayton King.
Premise.
A group of people are vacationing in the Grand Canyon, where they paddle through the Colorado River on a white water rafting tour run by a man named Dave Savage. As the trip goes on, the vacationers fall prey to a mysterious killer.
Production.
"Savage Water" was filmed on location along the Colorado River in Utah, and was the last of four films produced by director Paul W. Kener's company Talking Pictures. Screenwriter Kipp Boden was an actual Utah river runner. The film's theme music was provided by Doug Warr, and Kener's wife Karen and her band the KC Classics performed the song "Sherrie", which is used in the film.
Home media.
In May 2013, the film was released on DVD by Vinegar Syndrome as a double feature with the 1971 film "Death by Invitation".