Zdymadlo Čelákovice, Navigation lock near Elbe River in Čelákovice, Czech Republic.

Zdymadlo Čelákovice is a weir-and-lock complex on the Elbe at river kilometre 872.327, on the northern edge of Čelákovice. Its main parts are a movable weir with three 23 m spans, a single-chamber lock 85 m long and 12 m wide at the left bank, a small hydroelectric plant, a fish pass and a 550 m mill race. The weir stands 2.7 m high.

The weir and navigation lock were built by the Prague firm Lanna, whose construction began in 1934 after the Ministry of Public Works approved the project; both structures were inspected and approved in 1937 and entered service in 1938. The work was part of the third stage of Elbe riverbed regulation, carried out between 1931 and 1938. During construction the weirs by the mills on both banks were removed, and the old riverbed was reshaped into a 550 m millrace to keep the mills running.

The weir footbridge served as a public crossing of the Elbe for nearly 80 years until Povodí Labe closed it permanently in March 2013 after a 2011 assessment rated its condition critical. The city then built its own footbridge 400 m upstream, and a ferry linked the banks in the interim.

The weir footbridge served as a public crossing for nearly 80 years until Povodí Labe closed it permanently in March 2013 over its critical structural condition. A replacement footbridge now stands about 400 metres upstream, so cross the Elbe there rather than at the lock. The lock chamber lies on the left bank, the small hydro plant on the right.

The lock features a fish passage system that allows native fish species to move freely through the Elbe despite the water level barrier. This detail is worth knowing if you are curious about how the river ecosystem is protected alongside shipping infrastructure.