A dam in the Tarn region of France, intended to provide irrigation for agricultural land and costing 8.4 million euros, has remained completely unused since its construction. Known as the Sivens dam, it was built despite environmental and social opposition, and was never put into service. Now, the structure is set to be demolished, with the financial burden falling on local taxpayers, who had already paid for its construction. The project, which spanned over a decade, has become a notable example of the risks involved in launching major public infrastructure projects without adequate consultation or risk evaluation. The dam was initially planned to supply water for farming during droughts, a critical need in the region. However, environmental organizations raised concerns about its potential impact on a nearby wetland, which is an important ecological area. These concerns led to public protests and increased pressure on authorities, which eventually forced them to stop the project before it could be operational. Following years of legal disputes, a court ruled that the dam must be demolished, with the Tarn department responsible for covering the costs of the removal. This means that local taxpayers will end up paying for both the construction and the demolition of the dam. The situation has sparked broader conversations about how public projects are managed and has emphasized the need for thorough environmental and social impact assessments before starting such large-scale initiatives. The Sivens dam case also highlights the difficulties local communities face when trying to balance economic development with environmental protection. Wetlands are vital for regulating water flow and supporting biodiversity, which are increasingly important as droughts become more frequent in France. The failure of the Sivens dam serves as a cautionary tale about the importance of comprehensive planning and meaningful engagement with all stakeholders involved in public infrastructure projects.