Lucerne
Nadelwehr

The Nadelwehr regulates the flow of Lake Lucerne and powers the small power station at Mühlenplatz. It is one of the few dams of this type to have been preserved in its historic state. While dams on large rivers have been replaced by semi- or fully automatic mechanical devices, this one continues to be adjusted to the water level as before. In the event of large quantities of water due to storms, the opening of the dam has to be enlarged by four or five men equipped with hook-shaped "Zäppis", which pull out part of the 175 3.5-metre long needles.

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