Redesign of the Barrier on the River Dreisam in the City of Freiburg i.B.

In the course of straightening, the River Dreisam in the Black Forest was stabilised with several barriers, which restricted fish migration. The barriers were opened along part of the width and a groyne was added. As a result of these cost-effective measures it was possible to restore unrestricted fish access. Furthermore, the flow and structural diversity could be considerably improved.

Main Data

  • Number of redesigned barriers: 25
  • Drop height of each barrier: 20 to 50 cm
  • Length of upgraded river section: approx. 1.0 km
  • Construction costs per barrier: approx. € 800


Regional Administrative Council Freiburg i.B., Bad Säckingen office, Dept. 53.1


IUB Engineering AG, Construction supervision by the client

Construction period


Construction costs

€ 25,000

Scope of services

  • Options appraisal
  • Construction and implementation project
  • Advice on implementation