Kolksluis, Historic lock in Spaarndam-West, Netherlands
The Kolksluis operates with two sets of doors to regulate water levels between the IJ and Spaarne river, enabling vessel passage through precise water management.
Constructed in 1280 under Count Willem II of Holland's commission, this lock played a central role in protecting the region from saltwater intrusion and floods.
The structure represents Dutch engineering excellence in water management, functioning as a critical component of regional maritime infrastructure for over seven centuries.
Between May and September, visitors can access the lock on weekends to observe its mechanisms and learn about water control systems in the Netherlands.
This lock stands as Europe's oldest operational water control structure, maintaining its original function through numerous modifications since the thirteenth century.
Location: Haarlem
Inception: 1280
GPS coordinates: 52.41352,4.67882
Latest update: March 7, 2025 06:16
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Oostkolk 5, Spaarndam
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Westkolk 56, Spaarndam
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