This trip was funded by the Northern Jaguar Project to study birds and associated habitat on the Northern Jaguar Reserve in central eastern Sonora. We used inflatable kayaks to run the river for 9 days, from Las Tesotas to the Rio Sahuaripa bridge near Sahuaripa, Sonora.
The water in the Aros was running clear at about 15 cubic meters per second (530 cfs) when we put on, good for December. Rain on and off for two days spiked the water level up to around 60 cubic meters per second (~2100 cfs), causing the river to turn muddy. Once we hit the Bavispe confluence the level went even higher with heavy releases from Presa La Angostura.