The safety measures taken after the winter storms that profoundly altered the sandbanks in the Arcachon Basin passes have finally been lifted. Following in-depth surveys, the maritime authorities have approved the safe reopening of this sector.
Increased safety after storms
The storms of winter 2024 caused significant changes to the sandbanks in the Arcachon basin, making navigation perilous due to variable seabeds and strong currents. On April 5, 2024, the Local Nautical Commission (CNL) unanimously recommended the temporary closure of the passes. The Préfet Maritime de l'Atlantique then prohibited entry to and exit from the basin to ensure the safety of sea users.
Updated bathymetric surveys and buoys
After weeks of work, the Syndicat Intercommunal du Bassin d'Arcachon (SIBA) has carried out a complete bathymetric survey of the unstable seabed. Thanks to this data, the buoyage in this sector has been updated and is now operational, enabling safe navigation through the passes. It should be noted that only buoy 9N remains to be repositioned, with no impact on overall safety. This buoy is located inside the basin, not directly in the passes.
Repeal of closure order
Consequently, decree N° 2024/054, which delimited and regulated access to the Arcachon basin, was repealed by decree N° 2024/098 dated May 27, 2024. This repeal marks the end of restrictions and the resumption of normal nautical activities in the Arcachon basin.
Towards safer navigation
The reopening of the passes in the Arcachon basin marks a return to normal for the region's sailors. However, users are advised to remain cautious and refer to Notices to Mariners, in particular N°1881/24, to ensure safe navigation. The repositioning of buoy 9N, although not critical, is expected shortly to complete the safety arrangements.
Vigilance remains the order of the day, and the maritime authorities will continue to closely monitor the evolution of the seabed to prevent any future risks.
