For other uses, see Lenne (disambiguation).

The Lenne in Iserlohn-Letmathe.
Country Germany
Main source Sauerland
819 m (2,687 ft)
River mouth Ruhr
51°24′54″N 7°29′31″E / 51.41500°N 7.49194°E / 51.41500; 7.49194 (Mouth of Lenne)Coordinates: 51°24′54″N 7°29′31″E / 51.41500°N 7.49194°E / 51.41500; 7.49194 (Mouth of Lenne)
Basin size 1,353 km2 (522 sq mi)
Physical characteristics
Length 128 km (80 mi)
  • Average rate:
    25 m3/s (880 cu ft/s)

The Lenne River is a tributary of the Ruhr River, and has caused flooding in recent years.[1]

Having its source on top of the Kahler Asten near Winterberg in an intermittent spring at an elevation of 2,687 feet, the Lenne ends after a course of 128 km flowing into the Ruhr river near the city of Hagen. With an average discharge of 25 m³/s near its mouth, it is the main tributary of the Ruhr.


  1. Gôppert, H.; Ihringer, J.; Plate, E. J.; Morgenschweis, G. (April 1998). "Flood forecast model for improved reservoir management in the Lenne River catchment, Germany". Hydrological Sciences—Journal—des Sciences Hydrologiques. Pub. 43 (2): 215. CiteSeerX accessible. doi:10.1080/02626669809492119.
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