Tag Archive for: effacement d’obstacles

Dam Removal Day: celebrate free flowing rivers: 2 new factsheets to understand dam and weir removals

“On Dam Removal Day, 8 October 2025, NGOs in France and Europe reaffirm their commitment to restoring waterways and removing obsolete artificial barriers. More than 1.2 million structures block the free flow of European rivers and weaken the biodiversity and resilience of aquatic ecosystems. It is estimated that more than 200,000 of these structures are unused, abandoned or obsolete. Most are small structures less than 3 metres high, such as sluice gates, weirs and culverts, which bear witness to past uses. Their cumulative impact on biodiversity and the functioning of watercourses is significant. These obstacles isolate vulnerable freshwater species already weakened by the effects of climate change, impact fish migration, and promote the deposition of fine sediments that clog the riverbed upstream of the structures, etc.”

(read press release , in french only)

To reaffirm the advantages of removing obsolete structures that have a significant impact, ERN has published two fact sheets on experiences of removal in France:

– Removal of large dams on the Sélune, 4 pages, May 2025, ERN (french only)

For over a century, the Vezins and La Roche-qui-Boit dams interrupted the natural course of the river. Their removal allowed the Sélune to return to its original bed and natural dynamics. The result of many years of debate and scientific studies, this project restored ecological continuity and improved water quality throughout the watershed. Supported by numerous organisations, it will be scientifically monitored until 2027.

The initial results are already very promising. Atlantic salmon, European eels and sea lampreys have returned, natural sediment transport has resumed and biodiversity is increasing.

– Removal of the Rhodes Bridge weir, 4 pages, May 2025, ERN (french only):

This document summarises the main stages and challenges of the project to remove the Rhodes Bridge weir, which has reconnected nearly 29 km of free-flowing rivers, benefiting local biodiversity and the quality of aquatic environments.

Vidéos and cases sutides on youtube chanel : Rivières Vivantes – Laisser Couler – YouTube

World Rivers Day, another step towards freeing our rivers

This September, thanks to the support of the European Rivers Network under the Open Rivers Programme, a number of river barrier removal projects are scheduled in France, in sub-basins of the Dordogne, Loire, Gave de Pau and Rhône (see details in the press release).

After three years of implementation of the Open Rivers Programme, more than 140 projects have been supported throughout Europe, including around ten in France, thus contributing to achieving the objective of 25,000 km of free rivers by 2030 in Europe, as set out in the European regulation on nature restoration and measure 20 of the National Strategy for Biodiversity (SNB) 2030, which aims to strengthen actions in favour of ecological webs and remove their main obstacles. Faced with the consequences of climate change, removing weirs and dams that have no use or have a high impact is a key measure for limiting the warming of water, restoring access to refuge areas and increasing the resilience of habitats and species.

On World River Day, we feel it is important to point out that life in our rivers and the quality of our watercourses is still too severely degraded and that urgent action is needed to halt the erosion of biodiversity and cope with the effects of climate change. ‘Repairing rivers and making environments and species more resilient to variations in temperature and hydrology will depend solely on our actions and involvement. There is still a huge task to be done, and it is sometimes difficult to get people to accept it,’ explains Roberto Epple, President of the European Rivers Network. Yet these projects are the result of a long, complex and collective process, combining technical work and consultation, and sometimes militant struggle. So each ecological restoration project is a source of pride, an event to be celebrated that contributes to restoring our shared heritage.

The projects taking part in the Open Rivers Programme are located in sensitive, protected areas with high biodiversity potential, and will help to reconnect habitats for fish (trout, lamprey, salmon), white-clawed crayfish and pearl mussels. ‘By re-establishing the natural dynamics of the watercourse and facilitating the movement of species, we are restoring the system and the complex interactions between living beings and their environments, and providing an additional opportunity to adapt to climate change. These are ‘no-regrets’ measures that benefit everyone,’ explains Corinne Ronot, Project Manager at the European Rivers Network. A range of highly ambitious projects that the European Rivers Network has submitted to the Open Rivers Programme for funding, sometimes in addition to that provided by the French Water Agencies.

Read presse release (in french)