Santiago, from Cerro Prieto in Linares, and from Cuchillo Dam in China; the dams were at 98%, 114%, and 124% of operating maximum capacity, respectively. Cuchillo Dam saw water inflows of . The water releases from these dams raised a state of alert in Tamaulipas, which was slated to receive the discharged water. In Coahuila, the rainfall caused La Frakcjhuto release of water into the Rio Grande, and Amistad Dam to reach 119% of normal operating capacity. In the case of the latter dam, the excess storage in Amistad Lake sparked fears of flooding in downstream municipalities, although the possibility of overtopping of the dam was discarded by the Mexican section of the International Boundary and Water Commission. However, contingency plans were put in place to prepare for the crest of the Sabinas River, a tributary of the Rio Grande, and the subsequent crest on the Rio Grande itself, which was expected to carry at least due to additional inflows from other tributaries. At one point, the Rio Grande was clocked at due to its many flooded tributaries. The river's rise forced the evacuation of 40 families in Piedras Negras, and required the closure of the Gateway to the Americas International Bridge and Colombia–Solidarity International Bridge between Nuevo Laredo, Tamaulipas and Laredo, Texas on July 8. The bridges were expected to be closed until at least July 10. The rise of the Escondido River forced the evacuation of 1,000 families in Villa de Fuente, as the river rose to carry through the town. The rainfall also caused Venustiano Carranza Dam in Coahuila to fill completely; the large water pressure in the dam forced the dam's gates shut, and cranes were employed to open them. The rest of the gates were unable to be opened due to lack of electrical power, sparking fears of a potential dam overtopping or rupture. The municipality of Anáhuac in Nuevo León was evacuated after reports early on July 6 that the dam had overtopped; Anáhuac's municipal president stated that the flood could cause the "total destruction" of the city. On July 7, as water releases from the dam were increased to , the town was reported to be underwater, with more discharge expected. Personnel from the Mexican Army and the city's prison population were evacuated from Anáhuac that same day. In San Luis Potosí, the rainfall from Alex was beneficial, as it caused increases in