John Beal as Major Powell, Brian Keith as Bill Dunn, and James Drury as Walter Powell.
Reviewers from Letterboxd note that while the location footage of the Grand Canyon is beautiful, it is often undermined by unconvincing blue-screen shots and rear-projection techniques. Ten Who Dared
Critics and audiences from platforms like IMDb and Rotten Tomatoes generally agree on the following points: John Beal as Major Powell, Brian Keith as
Despite the high stakes of the real expedition, the film is often criticized as "dull" and "lackluster," failing to deliver the excitement one would expect from a river-running adventure. John Beal as Major Powell
While it serves as a "glorified orientation film" for the Grand Canyon, is largely remembered as a flawed effort that fails to capture the true peril of Powell's journey.