This volume of the Animas-La Plata series (SWCA Anthropological Research Paper No. 10) describes the results of excavations at one Late Archaic site, three Basketmaker II sites, nineteen Pueblo I limited activity sites, and six undated artifact scatters in Ridges Basin, located approximately 2 miles south of Durango, Colorado. The volume concludes with a summary discussion of chronology, architecture, material culture, population, subsistence, and settlement within both local and regional cultural contexts.