From the weir on the boundary of the districts Ottersheim and Knittelsheim, the Spiegelbach flows 9.2 km before reaching the Old Rhine at Sondernheim.
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After a devastating flood in 1745, in which the mills on the Altbach and Brühlgraben were flooded, it was decided to create a diversion from the Queich towards Bellheim, in order to provide the newly built mills with a steady supply of water.