These are the Houtrib locks, a lock complex on the route between Amsterdam and Lemmer in Lelystad. The complex was opened in 1975 and constist of two locks and a sluice. The Houtribdike separates the IJssellake from the Markerlake. The locks are each 190 m long and 18 m wide, they are suitable for vessels up to 5,000 tons. Every year some 88.000 ships pass through the locks. The sluice consists of six openings are sealed with steel lift gates.
I tried to make a photo of the "defecating Man" of my post of December 4th sitting on the locks.