Phoenix-See, Artificial lake in Hörde, Dortmund, Germany

Phoenix-See is an artificial lake in the Hörde district of Dortmund, Germany. The water body is surrounded by wide paths for walkers and cyclists, with lawns and low trees offering shade in many spots.

A steelworks stood on the site from 1841, when the Hermannshütte ironworks was already operating. Excavation for the lake began in September 2006, when around 2.5 million cubic metres of soil were removed. Filling with some 150,000 cubic metres of water started on 1 October 2010 and took about a year; the shore opened to the public on 9 May 2011.

The name Phoenix recalls the old steelworks and points to the rebirth of the site after the iron industry ended. Today you see sailors on the water and joggers along the shore paths who use the place as part of their everyday routine.

The lake is freely accessible in any season and can be walked or cycled around comfortably. The paths are mostly flat and paved, making it easier to move with a stroller or wheelchair.

The lake doubles as a flood reservoir for the Emscher: its basin can take in up to 360,000 m³ of extra rainwater, held back at a monk structure in the harbour basin and released in a controlled way. A phosphate elimination plant north of the lake filters up to 90 m³ of lake water per hour.