The John Wesley Powell expedition of 1869 explores the dangerous Colorado River, withstands internal dissension, and finally discovers the Grand Canyon.
William Dunn
George Bradley
Maj. John Wesley Powell
Walter Powell
Oramel Howland
Billy Hawkins
Jack Sumner
Seneca Howland
Frank Goodman
Jim Baker
Ashtishkel
Indian chief
Indian woman
Andrew 'Andy' Hall
McSpadden (uncredited)
