This isn’t the first time we’ve looked at unusual places in our city. We’ve already mentioned the incredible story of the Cusset hydroelectric power plant and, more recently, the former Citroën garage that has been converted into a state-of-the-art supermarket. But this time, we have to say that we were left speechless. This time, we’re diving into the bowels of Lyon. And even if we’re not talking about the “belly of Lyon” (our famous Halles Paul Bocuse), the former Caluire Water Plant was nonetheless a vital part of the city for many years!
The former Caluire water plant: an unsuspected underground world
Here is another jewel in Lyon’s heritage. But unlike all the others, it is invisible to the vast majority of its inhabitants. As we know, water is omnipresent in Lyon: its river, its peninsula, its many bridges and fountains…
What is less well known is the formidable technical feat that is the underground network, like the former Caluire Water Plant. Today, although not everything has been preserved as it was at the time, it is possible to visit the site:the building houses a monumental pump, which has been classified as a historical monument for over 35 years.
The highlight of the show: with our feet (almost) in the water
What makes the visit unique is undoubtedly the narrow staircase that leads straight to a huge 1,600 m² basin! The setting is both magical and enchanting. It’s hard to know where to put your feet… But don’t worry, they’ll stay dry during the visit!
We learn that these two huge basins, adorned with around thirty pillars and a suction gallery, were built in the 19th century to meet the needs of a city in the midst of industrial explosion by filtering the waters of the Rhône. These basins were in use until 1976, just 50 years ago. Despite the five decades that separate us from them, the site remains intact, much to the delight of visitors. The association L’Eau à Lyon et la Pompe de Cornouailles (Water in Lyon and the Cornish Pump) is campaigning for its preservation and promotion. The idea? To turn this former factory into a place of remembrance and transmission.
On World Water Day, Saturday, March 28, 2026, admission will be free, with no advance registration required. Outside of this event, guided tours are organized throughout the year (be sure to check the schedule in advance). It’s an original outing idea for the whole family (admission is free for children under 10). So, are you ready to dive into the history of Lyon?
📍 2 avenue de Poumeyrol, Caluire
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