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We report rediscovery of the Chihuahuan Dwarf Crayfish Cambarellus chihuahuae at the desert spring Ojo Solo in Ejido Rancho Nuevo in Chihuahua, México. This species was reported to be extinct. Morphological evaluation of 12 voucher specimens confirmed the population as C. chihuahuae. Crayfish were abundant upon rediscovery in September 2012 and remained so throughout bimonthly monitoring from February 2014 to April 2015. Despite abundance at Ojo Solo, the species is critically imperiled, with four of its five native habitats dry and the remaining one in decline; however, a population was established at Ojo Caliente, a nearby natural refuge habitat we created in Ejido Villa Ahumada y Anexos in late 2013. Conservation management of C. chihuahuae and associated endemic species is discussed.