In early April 2011 a 2 person crew took 2 inflatable kayaks down part of the Rio Aros and Rio Yaqui to do bird surveys on parts of the Northern Jaguar Reserve and nearby areas. The reserve encompasses 70 square miles of prime jaguar habitat just 125 miles south of the Arizona border. This area is one of the most remote and rugged wilderness left in northern Mexico.
The river was smaller than average for the time of year at around 130cfs (cubic feet per second). Once the summer mansoons start, the river swells drastically to many thousands of cfs... and the all the land moves from winter greys and browns to being entirely bathed in brilliant green.
For more info on running whitewater rivers in Mexico, including the Aros, see the Sierra Rios website.