Sylvenstein Dam is an earthen embankment dam in the Isar valley in the alpine part of Upper Bavaria Germany which impounds the Sylvenstein Reservoir (German: Sylvensteinspeicher).Several hydropower plants were built in the tributary of the upper Isar river in the 1920s for example at the Achensee and Lake Walchen Power Plant. Therefore the river ran nearly dry during the dry season. This mainly affected the town of Bad Tölz.
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