Dradenau was a branch of the river Elbe near Hamburg, Germany. The name was also used for two islands created by the channel, Gros Dradenau and Klein Dradenau (Big and Little Dradenau).

The islands of Dradenau were sold to Hamburg in 1445 by Count Otto von Holstein.H. Laue und H. Meyer: Zwischen Elbe, Seeve und Este, Verlag Gustav Elkan, Harburg/Elbe, 1925, Bd.II, S. 14 By 1840, it was leased as private property with two farms and 66 inhabitants.C. Walther: Dradenau und Tradenau, Mitteilungen des Vereins für Hamburgische Geschichte, Hamburg 1898/99, Bd. 19, S. 81 As part of the Hamburg port extensions, the Köhlfleet, another channel north of Dradenau channel, was reclaimed, which connected the islands to Waltershof, an area of Hamburg. By the late 19th century, the channel disappeared entirely due to silting and the construction of the port of Hamburg. A sewage treatment plant, Klärwerk Dradenau, currently exists where it used to flow.

See also List of rivers of Hamburg

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