Barrage d'Arzal, Dam and lock system in Arzal, France
The Barrage d'Arzal stretches 500 meters across the Vilaine River with five sluice gates, a lock system, and three fish passages for water management.
The construction plans originated in the 1930s following severe floods, but World War II delayed the project until its completion in 1970.
The dam transformed local maritime activities, leading fishermen and recreational boaters to adapt their practices in the Vilaine estuary.
The facility supplies drinking water to over one million residents across the regions of Saint-Nazaire, Auray, and Rennes through its treatment plant.
The structure sinks approximately fifty centimeters every decade due to its placement on thirty meters of silt, requiring regular elevation adjustments.
Location: Arzal
Elevation above the sea: 0.281 m
GPS coordinates: 47.49972,-2.38222
Latest update: June 23, 2025 09:44
Bridges of La Roche-Bernard
6.4 km
Plage de la Mine d'Or
8.5 km
Pont du Morbihan
7.1 km
Abbaye de Prières
8.1 km
Phare de Tréhiguier
4.5 km
Dolmen du Crapaud
7.8 km
Église Saint-Pierre-et-Saint-Paul de Nivillac
8.4 km
Chapelle Saint-Jean-Baptiste de Lantierne
3.5 km
Cairn des Grays
8.4 km
Musée de la Vilaine maritime
6.3 km
Maison du Canon
6.3 km
Église Saint-Gildas de Pénestin
7 km
Chapelle Notre-Dame-de-la-Salette de Camoël
2.7 km
Pottery kilns in Landieul
6.7 km
La Roche-Bernard bridge (1839)
6.5 km
St Hilary, Assérac
7.8 km
La Roche-Bernard bridge (1960)
6.4 km
Église Saint-Michel de La Roche-Bernard
6.5 km
Église Notre-Dame-du-Bon-Garant de Férel
3.6 km
Église Saint-Martin de Camoël
2.3 km
Chapelle Notre-Dame de La Roche-Bernard
6.3 km
Église Saint-Pierre de Marzan
6.4 km
La Couronne
6.1 km
Église Saint-Martin d'Arzal
1.9 km
Abbatiale de l'abbaye de Prières de Billiers
8.4 km
Cannons of the Juste
6.1 km
Promenade du Ruicard
6.2 km
Pierre Blanche
4.9 kmReviews
Visited this place? Tap the stars to rate it and share your experience / photos with the community! Try now! You can cancel it anytime.
Discover hidden gems everywhere you go!
From secret cafés to breathtaking viewpoints, skip the crowded tourist spots and find places that match your style. Our app makes it easy with voice search, smart filtering, route optimization, and insider tips from travelers worldwide. Download now for the complete mobile experience.
A unique approach to discovering new places❞
— Le Figaro
All the places worth exploring❞
— France Info
A tailor-made excursion in just a few clicks❞
— 20 Minutes