Sally Blane (Ruth Dexter)
Charles Starrett (Tom Caldwell)
William Farnum (B.J. Dexter)
Irving Pichel (Bronte)
Dave "Tex" O'Brien (Dam Phone Operator)
Hardie Albright (Allan Dexter)
Robert E. Homans (Dam Engineer)
John Dilson (Doctor)
Howard Hickman (Board Member)
Murray Kinnell (Dr. Flynn)
Doris Dawson (Molly)
Harry Allen (McGregor)
James Bradbury (Lowery)
Arthur Lake (Crawford)
Theodore Von Eltz (Ed Tyler)
Guinn "Big Boy" Williams (Higgins)
Edgar Kennedy (O'Brien)