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Dams cut off the fish on the Iller from their spawning grounds. At the same time, they prevent the current from carrying gravel from the mountains downstream, which causes problems with flood protection. The river is now being renovated at a cost of many millions of euros. Dams and river straightening have led to an impoverishment of natural biodiversity along long stretches of the Iller. Many species of fish, birds and insects are endangered because they no longer have suitable habitat. Hydroelectric power stations and other dams not only cut off the fish's path for their spawning migrations, they also prevent the current from carrying gravel downstream. This in turn has a negative impact on flood protection and the groundwater level. The river is currently being renovated at a cost of many millions of euros, including the "Agile Iller" project, which could also be groundbreaking for other Bavarian Alpine rivers. Gravel banks are being created, barriers for migratory fish species are being removed, and tributaries and alluvial forests are being reconnected to the Iller. Here you can find our BR24 website: http://www.BR24.de BR24 newsletter - subscribe here: http://br24.de/newsletter BR24 Facebook: / br24 BR24 Twitter: / br24 BR24 Instagram: / br24