In 1958 the weir was built at Hagestein to monitor the water management in the Netherlands. The visor slides are striking: two arc-shaped steel structures that can be opened and closed, so that the flow of the river can be regulated. The Hagestein weir was designated as a protected national monument in 2014.
A fish passage was constructed in 2004 to prevent nature from suffering too much from the weir. Fish that pull up the river from the sea to spawn can jump through the lock via special stairs. The fish can be observed from a parking lot nearby.
Weir complex Hagestein
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Hagestein
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