The MOSE Flood Barriers
Last updated on September 10, 2026Overview
MOSE is the system of mobile gates built across the three inlets of the Venetian lagoon to shut out the Adriatic when a high tide threatens the city.
Seventy-eight steel gates lie flat on the seabed, full of water and invisible. When they are needed, compressed air forces the water out and they rise on hinges to stand above the surface, closing the lagoon off for a few hours until the tide falls.
It was first raised in earnest on 3 October 2020, and it worked. Getting there took seventeen years, roughly six billion euros and a corruption scandal that reached the mayor of Venice.
Visit Responsibly
These are secured operational sites. Do not attempt to approach the barriers, the caissons or the control buildings by land or by boat -- the exclusion zones are enforced and the machinery is live.
If you are in Venice during a closure, remember it is a civil-protection operation, not a display. Follow the city's instructions and keep out of the way of the people running it.
The barriers are contested locally, on cost, on ecology and on what they mean for the lagoon's future. Visitors are better served by understanding the argument than by treating the works as a spectacle.
Reaching the viewpoints by public boat rather than a private one keeps wash out of channels where the salt marsh is already eroding.
Plan Your Visit
MOSE is infrastructure, not an attraction, and there is no general public access to the barriers.
What you can do is see the works. The most accessible viewpoint is Punta Sabbioni at the Lido inlet, where the breakwaters, the artificial island and the control buildings are visible from the shore and from the Venice boat.
The Chioggia inlet works are visible from Sottomarina, and the Malamocco locks from the Lido and Pellestrina.
Organised guided visits to the sites run periodically through the consortium and local operators, but they are limited, must be booked well ahead, and are not a walk-up option.
The most reliable way to see MOSE actually working is to be in Venice during a high-tide closure in autumn or winter -- announced in advance by the city's tide forecast.