In 1767, the corregidor Luis Manuel de Zañartu, launched one of the most important architectural works of the entire colonial period, Calicanto Bridge, effectively connecting the city to La Chimba on the north side of the river, and began the construction of embankments to prevent overflows of the Mapocho River. Although its builders were able to complete the bridge, the piers were constantly being damaged by the river. In 1780, Governor Agustín de Jáuregui hired the Italian architect Joaquín Toesca, who would design, among other important works, the façade of the cathedral, the Palacio de La Moneda, the canal San Carlos, and the final construction of the embankments during the government of Ambrosio O'Higgins. These important works were opened permanently in 1798. The O'Higgins government also oversaw the opening of the road to Valparaíso in 1791, which connected the capital with the country's main port.