In 1544, the Hondsbossche and Duinen polder control board in Petten built the Grote Sluis or Hondsbossche Sluis (near Dam 1) for the supply of stone from Belgium for the Hondsbossche Zeewering. There followed innovations in 1722-'24 and 1845 (J. Leguit). On the south side are natural stone weapons of the aforementioned hoogheemraadschap in a rich Louis XIV-frame by Jacob van der Beek (1724).
On the north side two arms are visible from the water board of the Uitwaterende Sluizen in Kennemerland and Westfriesland. This in 1780 by J.M. Cressant-made stones with decorative representations (including Neptune) were originally on the Duikersluis (1612, renewed 1778). At the lock there is a lock master and an old house (Dam 1 and 1b) from 1724. In 1903, the Kleine Sluis and the Duikersluis were converted to plans by J.C. Replace Nifterik with one large lock, the Wilhelminas lock. The corresponding lockkeeper's lodge (Wilhelminastraat 6) is executed in neo-Renaissance style. The Beatrix Bridge was laid over the lock in 1957-'58 (north side). The Wilhelminabrug (south side) was renewed in 1965 after widening the lock chamber.
The early-17th century Overtoomsluis (near Westzanerdijk 532) was rebuilt in 1719 by P.C. Zeeman and has a sluiswachterswoning from around 1890. In 1726 renovated the 17th century Papenpadsluis (at Westzijde
214; control house circa 1925). The Hanepadsluis (Hanenpad approx.) Is a former sea lock from 1713-'14, renewed in 1852 by J. Leguit (restored 1936). From the Mallegat lock (Westside approx.), A lock built in 1634, the whirlpool and the control house were renovated in 1916. The lock was further restored in 1938 and provided with a lift with concrete towers. On the foundations of the Hornersluis (1703) is the white plastered pumping station Soeteboom (Hogendijk 102) from 1874 (renovated 1898, electrified 1917).
