One the Arroyo de Alamar or Rio Alamar, runs in its upper reaches in the United States as Cottonwood Creek, and is impounded in by two dams, Barrett and Morena, to supply water to the city of San Diego.
One the Arroyo de Alamar or Rio Alamar, runs in its upper reaches in the United States as Cottonwood Creek. It runs from its source in the Laguna Mountains southwestward where it is impounded in by two dams, Barrett and Morena, to supply water to the city of San Diego.