Ruesga Dam Historical milestone · Cervera de Pisuerga, Montaña Palentina, Palencia Built in 1923 to regulate the river Rivera, the dam created a reservoir of ten cubic hectometres that today has an authorised bathing area and a recreational area at the foot of the parador, right on the edge of Cervera. 1923 Photo: Dbascones (CC BY-SA 4.0) What to see and do in Cervera de Pisuerga