
The middle Rio Grande sub-basin consists of the portion of the river flowing from just below International Amistad Reservoir to just above International Falcon Reservoir and also includes San Felipe Creek. This 303-mile (487 km) stretch of the river flows past five counties in Texas and the Mexican states of Coahuila, Nuevo Leon, and Tamaulipas. Del Rio, Eagle Pass and Laredo, along with Mexican sister cities Ciudad Acuņa, Piedras Negras, and Nuevo Laredo comprise the bulk of the population living along the Rio Grande in this reach. Laredo, in particular, is one of the fastest growing cities in Texas. Increased trade with Mexico, manufacturing growth, and tourism have contributed to population increases in the area.
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