Los Campitos Reservoir
The 586th tallest dam in the world
Los Campitos Reservoir (Embalse Los Campitos) is located in the Anchieta ravine, near Los Campitos, above Santa Cruz de Tenerife, in the Canary Islands. The dam was constructed in the 1970s, after which it was discovered that the basin could not hold water. It was subsequently waterproofed in 1978, but has never held water. It was remodeled in the early 2000s, with an enclosed tank and a new pipeline constructed. A study has been conducted to build a hydroelectric plant at the reservoir.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).