Große Tränke, Weir in Fürstenwalde/Spree, Germany.

The Große Tränke is a weir on the Spree River in Fürstenwalde that consists of concrete elements and mechanical gates. This structure controls water flow and creates water level conditions suitable for boat traffic.

The weir Große Tränke was built in 1890 together with the western section of the Oder-Spree Canal to hold water in the roughly 24 km stretch between Fürstenwalde and Wernsdorf. It served until the late 1990s; a new weir with three fields was commissioned on 18 December 1997, and a fish ladder was added east of it in 2007. The nearby lock, opened in 1891 and doubled in 1910-1912, was taken out of service in 1950 and demolished in 2004.

The name Große Tränke refers to the canal stage and its former lock, not to a livestock watering place. The weir built in 1890 held the water level in the roughly 24-kilometre western stretch of the Spree-Oder Canal; since 1997 a new weir with three fields has done this, and a boat slip lets sport boats pass between the Fürstenwalder Spree and the Müggelspree.

The weir stands about 150 m north of the former Große Tränke lock site, where the Spree becomes the Müggelspree. A boat slipway beside the weir lets sport boats pass between the Fürstenwalder Spree and the Müggelspree. A bridge built in 2007 crosses the fish ladder east of the weir.

The old lock beside the weir was taken out of service in 1950 and demolished in 2004; its gates had stood open for long periods because the Dahme flood-relief canal, built from 1911, had made it redundant. The weir itself was rebuilt and recommissioned on 18 December 1997.