San Roque, Water reservoir near Villa Carlos Paz, Argentina.

San Roque is a water reservoir in the Punilla Valley near Villa Carlos Paz, covering 16 square kilometers (about 6.2 square miles). The water reaches depths up to 25 meters (approximately 82 feet) and sits at an elevation of 643 meters (around 2,110 feet) above sea level.

The first dam, designed in 1884 by Cassaffousth, Bialet Massé and Dumesnil, was finished in 1886 and officially inaugurated in 1890, built of stone, sand and hydraulic lime to supply Córdoba with water and control floods. By 1892 it suffered from a lack of maintenance and a political scandal erupted. A second concrete dam, promoted by Governor Amadeo Sabattini, was completed in 1944 about 150 m downstream.

Local families come to fish, swim and sail on the water, especially during weekends and holidays. Shallow stone edges along the shore attract people who gather to sit and picnic near the water.

Access to the shoreline areas is open throughout the year, with summer months drawing the most visitors. Paths along the water are mostly flat and allow easy walking for most people.

The first dam was finished in 1886 and inaugurated in 1890, not 1888. When engineers tried to demolish it, the dynamite only blew off the metal railing, so the new dam was built several metres in front of the old one. At low water the upper part of the original structure shows above the surface.