Sluice Podbaba, Navigation lock in Podbaba district, Prague, Czech Republic

Zdymadlo Troja-Podbaba is a water stage on the Vltava at river kilometre 43.50, comprising the Troja weir at km 45.58, a three-kilometre navigation canal along the left bank past Císařský ostrov, and a pair of locks at the canal's end. The right lock chamber measures 135 by 12 metres, the left 73 by 11 metres, with a height of 8.5 metres and a level difference of 5.5 metres.

The lock was built in the late 1800s to improve navigation on the Vltava River and handle varying water levels more effectively. It represents a period when Prague modernized its waterway infrastructure to support transportation and commerce.

The weir's former log-floating chute, 409 metres long and 12 metres wide along the right bank, was rebuilt in the early 1980s as a sports slalom course. The lock is still called the Vltava Canal in older references, and the seasonal Prague Steamboat Company line ends at the Troja – Císařský ostrov landing below the bridge.

The area is accessible year-round and offers a good vantage point to watch the lock system operate. A walk along the riverside path gives you a clear view of the mechanics and how boats use the facility.

The weir's former log chute, 409 metres long and 12 metres wide along the right bank, was rebuilt in the early 1980s as a whitewater slalom course. The lock's small hydroelectric plant, running since 1995, uses two Kaplan turbines set in the side walls of the large chamber.