La Roche-qui-Boit dam removal

Sélune river, Normandie, France, 2021-2022

La-Roche-qui-Boit dam 2019  © ERN France Roberto Epple

La-Roche-qui-Boit dam June 20 2022 © ERN France Roberto Epple


As confirmed by the authority of res judicata and separate from the legal justification for  removal, the Selune Valley renaturation project was necessary for both scientific and technical reasons. (See the chronology of the removal).

The Vezins and La Roche-Qui-Boit reservoirs (36 m and 16 m high) create extremely large bodies of water that take away the natural character of close to 25 km of the Sélune River and constitute an unsurmountable hinderance for migratory fish that frequent this coastal river. 700km2 of the Sélune watershed are inaccessible.

Given the impacts, the regulatory obligations made previously to bring them up to standard, water quality problems they generate, their low energy productivity and reports which conclude it is technically impossible to rearrange them, removal the dams at the end of the concession period back in 2007 was requested by NGOs and also the represantatives of SAGE. Local opposition has also been strong.

Deconstruction of the two dam is scheduled for 2020-2022. An important scientific monitoring program has been supporting this project since 2012.

The Sélune dams removal project

The works and project management

EDF, the project manager for the site, will launch the sediment management work in June 2020. The final emptying of the reservoir is scheduled for April 2021 and the deconstruction of the dam at the end of 2021-early 2022.

Videos & reportages


Characteristics of the La-Roche-qui-Boit dam

– Built between 1916 et 1919
Located 12 km from the sea
– Power : 1,6MW
– Production : 4,7 GWh
– Height : 16 mètres
– Width : 129 mètres
– Volume of the reservoir : 1,4 millions m3
– Length : 4 km
– Surface : 40 ha

Sélune river after emptying reservoir and removal, habitats recovered !

photos coming asap

Our activities on Selune dams are supported by .