Salado River, river in northeastern Mexico. It rises in the Sierra Madre Oriental in Coahuila state and flows generally east-northeastward for some 175 miles (280 km) into the lake created by the Venustiano Carranza Dam at Don Martín. Leaving the reservoir, the Salado, joined by the Sabinas River, winds southeastward for 110 miles (175 km) through northern Nuevo León and northwestern Tamaulipas states and joins the Falcón Reservoir on the Rio Grande (Río Bravo del Norte) opposite Zapata, Texas. The Salado is economically important, for its waters are used extensively for irrigation, particularly for cotton growing.