Kolksluis, Historic lock in Spaarndam-West, Netherlands
Kolksluis is a lock in the Spaarndam-West area near Haarlem that connects the IJ and Spaarne rivers. The structure has two sets of gates that control water levels and allow vessels to pass through.
The lock was built in 1280 under the commission of Count Willem II of Holland to protect the region from saltwater intrusion and flooding. It became essential for shipping and water management in the area.
The lock sits at the heart of a working waterway where boats pass through daily, and visitors can watch the gates open and close with the rhythm of local river traffic.
You can view the lock year-round from outside and watch it in operation. Guided visits are offered during warmer months to learn more about how it works and its role in water management.
The lock has operated almost unchanged since the 13th century, making it one of the oldest working structures of its kind in the world still performing its original purpose. Few visitors realize how ancient this simple system truly is compared to modern engineering.
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