Primero River

Once inside the city, the river channels into La Cañada, a waterway delineated by a stonework canal built through the downtown area, and inaugurated in 1944.

During the crisis years of 1988–91 and 2001–02, the duck population was devastated, allegedly by people desperately looking for food.

[citation needed] It was reported in March 2006 that a large number of ducks had died due to unspecified causes.

[2] Pollution of the water and of the riverbank is a major environmental issue in Córdoba.

Periodic cleaning operations are carried out to increase the quality of the water and to preserve the viability of fishing, both in the San Roque reservoir area and downstream.