Walthenberg Canyon Named after John Walthenberg or Waltenberg (debatable spelling), companion of W.W. Bass. Due to its size, this is a major obstacle to travel along the Tonto platform. An enormous agave pit near the bed shows the area was inhabited. The rise from the bed to the top of Powell Plateau is one of the most dramatic anywhere in the Canyon.
1990 September - The circumambulation: day 8.