Earlier in its place there used to be two historically older dams, Šítkovský and Old Town, and there was a system of lock chambers. The lock was built by Lanna between 1911-1922. Technically, it is composed of four successive gates. From the end of the Children's Island then proceeds through the wall a separate channel that leads to Old Town weir at Sova's Mills. Today the operator of the weir is the state enterprise Vltava River Basin.
The lock chamber at Smíchov is the busiest lock on the River Vltava. The tourist shipping is its prime interest.