Sluizencomplex Aduarderzijl
The first locks at Aduarderzijl were built quite early on: around 1400. The lock, which was still made of wood at the time, ensured that excess water from the area around the city of Groningen flowed into the Reitdiep.
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Until the nineteenth century, the Reitdiep was directly connected to the sea, allowing the water to flow out freely. During the St Martin’s Flood of 1686, this sluice was completely washed away. Today, there are two sluices in Aduard: the Aduarderzijlen, a western drainage sluice built in 1706, and an eastern one dating from 1867.