Grevelingendam, Compartmentation dam between Schouwen-Duiveland and Goeree-Overflakkee islands, Netherlands
The Grevelingendam is a compartmentation dam extending 6 kilometers across water between two islands in southern Netherlands. It contains navigation locks and control structures that manage water flow while supporting the road that connects Schouwen-Duiveland to Goeree-Overflakkee.
Construction began in 1958 and finished in 1965 following the devastating 1953 North Sea flood that impacted the region. The project was part of the Delta Works, a major effort to prevent future flooding in low-lying Dutch areas.
The lock system reflects how Dutch engineers linked water management with transportation needs. Walking across the dam, you notice how it serves both as a barrier and a bridge connecting two communities.
The N59 motorway runs along the entire dam, making it the main vehicle connection between the islands. You can cross by car, bus, or bicycle with good views across the water on both sides.
Engineers used a cable car system to gradually close the northern channel during construction, managing the challenging tidal conditions. This innovative approach allowed the dam to be built safely despite the constantly shifting water levels.
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