The Cachi dam is a thin double-arch concrete structure ( stated to be one of the thinnest such dams in the world ) ) built to a height of above the deepest foundation . It is located in a narrow gorge and has a crest length of , impounding 51 million cubic metres of inflows of the Reventazon River . During the 1991 Limon earthquake , the dam did not suffer any damage even though the epicentre was away from the dam . However , there was a temporary suspension of power generation at the powerhouse located away , due to dislocation of the transformers
1991 Limon earthquake
1991 Limon earthquake
Lake Cachí