Like most of the old villages of the Taraco Peninsula, Chiripa shrunk during the LF1. Sector E has a population index value of 353, while Sector D (MF) has a value of 445. This represents a population index growth rate of -0.04% annually, the first time during its history in which the population of Chiripa declined.
Monumental construction continued, however. The Upper House Level structures (see section 6.3) were burned and demolished at the beginning of the LF1, and a large earthen mound was constructed over the resulting rubble. This mound is the mound that is visible today at Chiripa. This mound was then faced with cut stone, and an elaborate sunken court was constructed on top, again using large quantities of imported cut stone ([Bennett 1936]). There were apparently summit structures associated with this mound ([Chávez 1988]), though we know little about them.