Kallosluis, Maritime lock in Beveren, Belgium

Kallosluis is a sea lock in Beveren that allows large vessels to enter the port while accommodating their size. The structure manages water levels efficiently to move different ship types through its chambers.

Built from 1979, the Kallosluis initially operated only occasionally, run by volunteers. It entered continuous service in 1988 under head traffic controller Frans 'Frank' Huysmans, an adviser during construction, with a few permanent lock operators and freelance volunteers because left-bank shipping was still sparse. It later became busy, mainly with container traffic and car carriers such as Hyundai, Mitsubishi, Kia, Honda and Mazda. The Kieldrechtsluis was added as an alternative link to the Scheldt via the Deurganckdok.

The lock is named after the village of Kallo, where it lies. Its traffic is dominated by car carriers, mostly shipping Japanese vehicles: Hyundai, Mitsubishi, Kia, Honda and Mazda hold concessions in the left-bank docks it serves. Inland navigation has also grown strongly, and barges use VHF channel 1.

The lock is accessible to visitors during operating hours, though some areas may be restricted for safety reasons. It is wise to check current conditions before visiting to ensure a smooth experience.

The lock's operational width is 48 metres rather than 50, because floating beams one metre wide line both sides. Its sill lies at -12.58 m TAW, but the permitted draught of 12.25 m is set by the water depth of the Waasland Canal at the Beverentunnel, leaving 10% keel clearance. In its early years volunteers operated it only occasionally.