Enciso Dam, Gravity dam in Enciso, Spain

Enciso Dam is a gravity dam crossing the Cidacos River in La Rioja, built from roller-compacted concrete. The structure measures 375 meters long and rises 104 meters above the riverbed.

The Enciso Dam was built by the joint venture UTE Presa de Enciso, formed by FCC and ACS/Dragados, in the upper Cidacos basin. After several stoppages and delays, it was inaugurated in January 2019. Once completed, the reservoir was planned to store 47 hm³ and supply water to the municipalities of the Cidacos.

The dam takes its name from the municipality of Enciso, in La Rioja, where the Cidacos rises. Its reservoir is planned to store 47 hm³ for regulating and supplying water to the Cidacos municipalities. The concrete wall, 375 m long at the crown, is a landmark visible from the upper Cidacos valley.

The dam is not open to visitors and has no crossing on its crown; it is an active construction site in the process of being emptied. The structure stands in the upper Cidacos basin within Enciso municipality, and the access road is a service track for the works.

The dam is a roller-compacted concrete gravity structure whose wall was designed to stand 104.15 m from the foundations, 94.5 m above the riverbed, and 375 m long at the crest. Its construction was awarded to the UTE Presa de Enciso, a joint venture of FCC and ACS/Dragados, and was planned to use 692,000 m³ of concrete. Once complete, the reservoir is to hold 47 hm³ for regulating and supplying water to the Cidacos municipalities.