Pontillón de Castro Reservoir, reservoir in Pontevedra, Spain

The Pontillón de Castro Reservoir is a 10.8-hectare reservoir in Verducido, Pontevedra, held back by a gravity dam built of granite masonry between 1943 and 1956. The dam stands 23 metres high above its foundations and has a crest 159 metres long; its free-flow spillway is made of reinforced concrete. The reservoir is fed by the Rons river, also called Loural, and other small streams.

In 1939, with the Lérez often low, engineer Rafael Picó drafted a plan to expand Pontevedra's drinking water supply. The work was awarded in March 1943 for 998,014 pesetas plus 176,765 for expropriations. In 1947 the dam held half a million litres and was raised to 23 m; after leaks were found in 1949, sealing works were completed in 1956.

The reservoir is named after the Castro hill above it, in the parish of Verducido. Since 2007 the Pontillón do Castro sports centre, designed by José Ramón Garitaonaindía de Vera, has hosted canoeing events, including the 2007 European Flatwater Canoeing Championships and the 2012 World Championships. The forest park opened in 2010 on land reforested after the 2006 Galicia wildfires.

The Pontillón forest park opened in 2010 on land reforested after the 2006 Galicia wildfires, with three marked walking routes: the Presa (dam) route, the Castro route and the Outeiro route, plus a climbing wall. The dam crest is 159 m long and can be walked, giving a close view of the granite masonry wall and the 10.8-hectare reservoir.

The dam's spillway is a free-flow reinforced concrete structure able to discharge 50 m³/s, distinct from the granite masonry of the 159 m crest. The reservoir holds 10.8 hectares of water, and the forest park opened in 2010 on land reforested after the 2006 Galicia wildfires, with three trails: da Presa, de Castro and de Outeiro.