Floods, Ille-et-Vilaine and 4 other départements, January 2025
18,293 hectares of flooded area mapped by State services
8,583 hectares in Natura 2000 or under regulatory protection
47% of the observed flooded area159 protected animal species recorded within reach in the ten years before the flood
9 animal species threatened on the national Red List, protected or not
birds: by their population in the flood's season
- Communes declared
- 129
- Dates per the orders
- 23 January to 5 February 2025
- Départements
- Ille-et-Vilaine, Morbihan, Loire-Atlantique, Maine-et-Loire and Mayenne
- Flood type
- river flooding, runoff or mudflow
- Heaviest rainfall
- 48.1 mm
- in one day (Morbihan, 26 January 2025), PLOERDUT station · per Météo-France
- 21 January 2025: 3.2 mm
- 22 January 2025: 5.4 mm
- 23 January 2025: 10.2 mm
- 24 January 2025: 24.2 mm
- 25 January 2025: 2.6 mm
- 26 January 2025: 48.1 mm
- 27 January 2025: 11.4 mm
- 28 January 2025: 6.4 mm
- 29 January 2025: 26.7 mm
74.9 mm from 24 to 26 Jan, up to the wettest day
The flood's dates
- Peak discharge
- 1,385 m³/s
- La Vilaine à Rieux - Pont de Cran, on 30 January 2025 · provisional Hub'Eau value, it can be revised
- Extent
- flooded area mapped by State services
- 18,293 ha
Protected species recorded within reach
Observations recorded in the ten years before the flood, some known only to within a few kilometres, up to 10 km, when their published position is blurred or given by grid square. They tell which species were reported there, not what became of each animal.
1,075 species recorded within reach
159 protected animal species among them and 6 protected plants
9 animal species threatened on the national Red List, protected or not (vulnerable, endangered or critically endangered)
134 Birds
9 Amphibians
7 Reptiles
6 Fish, molluscs and crayfish
3 Mammals, bats included
For birds, the category is the one of their population at the flood's season (breeding, wintering or passage birds): a bird with no dated record within reach in that season in the GBIF data has none, and the breeding category needs at least two dated records in June or July. In the migration season (March, August to October), a bird that neither the passage list nor the wintering list assesses takes its breeding category only if it was recorded at least twice within reach in June or July. The list used is named under each species.
The most notable protected animal species
Species with at least three observations (for a bird, three in the months that give it its category, and no bird without a record at the flood's season), the most threatened first, then the most recorded. An observation is a published record: it can count one or several animals, and the same animal can be noted several times. When their published position is imprecise, blurred or given by grid square, they are said to be "within reach or nearby".
Fish, molluscs and crayfish
For fish, national protection (order of 8 December 1988) covers their eggs and spawning grounds: several are fished legally.
Birds
The observations cover every season: a migrant bird recorded there may have been away on the day of the flood.
Reptiles
Amphibians
Photos: Wikimedia Commons, each under its own licence (CC BY, CC BY-SA, CC0, public domain). Credit for each photo
In the water's path
Establishments registered today within reach of the flood, at their declared address or at the point Géorisques gives. They were not necessarily there on the day of the flood, and the dataset does not say whether they were flooded. An ICPE-classified farm can also be in the SIRENE register: these counts do not add up.
2 ICPE-classified livestock farms located within the flood's reach
Géorisques · ICPE22 livestock businesses in the SIRENE register based within the flood's reach
SIRENE register · InseeNo veterinary practice based within the flood's reach
SIRENE register · InseeNo animal protection association based within the flood's reach
National register of associationsNo wildlife association based within the flood's reach
National register of associations
Of the 22 livestock businesses in the SIRENE register: 12 cattle, sheep, goat or pig farms, 3 horse farms and 7 farms of other animals.
A wildlife association is an association whose declared purpose in the national register of associations is the preservation of wildlife: the register does not say whether it runs an authorised care centre. Associations are counted at their declared address: an association or a care centre based outside the area can work across all of it.
Protected areas within reach
Area of each site within reach of the flood, and the share of the site it represents. Natura 2000 and regulatory protection first, then the ZNIEFF.
- Marais de VilaineNatura 2000, Habitats Directive8,583 ha within reach78.9% of the site
- Marais de la Vilaine en amont de RedonZNIEFF type II (inventoried natural area)1,066 ha within reach97.0% of the site
- Marais de la Vilaine en aval de RedonZNIEFF type II (inventoried natural area)1,050 ha within reach95.1% of the site
- Marais de Beganne et TrefinZNIEFF type I (inventoried natural area)693 ha within reach91.9% of the site
- Marais de Saint-Dolay, du Bezo et de la CoraisZNIEFF type I (inventoried natural area)687 ha within reach96.8% of the site
- Gravières du sud de RennesZNIEFF type I (inventoried natural area)635 ha within reach84.3% of the site
- Marais de FegreacZNIEFF type I (inventoried natural area)491 ha within reach97.7% of the site
- Marais de RieuxZNIEFF type I (inventoried natural area)423 ha within reach99.9% of the site
- Confluence Oust-AffZNIEFF type I (inventoried natural area)382 ha within reach79.1% of the site
- Marais de l'Isac entre Genrouet et Pont-MinyZNIEFF type II (inventoried natural area)162 ha within reach11.9% of the site
- Lac de MurinZNIEFF type I (inventoried natural area)160 ha within reach99.5% of the site
- Marais de GannedelZNIEFF type I (inventoried natural area)133 ha within reach100.0% of the site
A ZNIEFF is a wildlife inventory, with no regulatory protection.
The declared communes
129 communes declared a natural disaster (flood) for this flood, département by département.
Ille-et-VilaineSee the 77 communes
Acigné, Amanlis, Bain-de-Bretagne, Bains-sur-Oust, Baulon, Betton, Boistrudan, Bourg-des-Comptes, Bréal-sous-Montfort, Brie, Bruc-sur-Aff, Bruz, Cesson-Sévigné, Chartres-de-Bretagne, Châteaubourg, Chauvigné, Chavagne, Comblessac, Corps-Nuds, Feins, Gévezé, Goven, Grand-Fougeray, Guichen, Guipry-Messac, Hédé-Bazouges, Iffendic, Janzé, La Chapelle-de-Brain, Laillé, Langon, Lassy, Le Rheu, Lieuron, Marcillé-Robert, Mézières-sur-Couesnon, Montfort-sur-Meu, Montreuil-sur-Ille, Mordelles, Mouazé, Nouvoitou, Noyal-Châtillon-sur-Seiche, Noyal-sur-Vilaine, Pacé, Paimpont, Pancé, Piré-Chancé, Pléchâtel, Pont-Péan, Redon, Renac, Rennes, Retiers, Rimou, Saint-Armel, Saint-Aubin-des-Landes, Saint-Erblon, Saint-Germain-sur-Ille, Saint-Gilles, Saint-Grégoire, Saint-Jacques-de-la-Lande, Saint-Just, Saint-Malo-de-Phily, Saint-Médard-sur-Ille, Saint-Senoux, Sainte-Anne-sur-Vilaine, Sainte-Marie, Sens-de-Bretagne, Sixt-sur-Aff, Thorigné-Fouillard, Tinténiac, Val-Couesnon, Vern-sur-Seiche, Vezin-le-Coquet, Vieux-Vy-sur-Couesnon, Vignoc, Vitré
MorbihanSee the 29 communes
Arzal, Baud, Béganne, Bréhan, Camoël, Camors, Carentoir, Cournon, Josselin, La Gacilly, La Roche-Bernard, Les Fougerêts, Malestroit, Missiriac, Muzillac, Nivillac, Peillac, Pleucadeuc, Pleugriffet, Rieux, Rochefort-en-Terre, Saint-Congard, Saint-Dolay, Saint-Jacut-les-Pins, Saint-Laurent-sur-Oust, Saint-Martin-sur-Oust, Saint-Perreux, Saint-Vincent-sur-Oust, Théhillac
Loire-AtlantiqueSee the 15 communes
Avessac, Blain, Derval, Guémené-Penfao, Guenrouet, Guérande, Herbignac, Jans, Le Pouliguen, Massérac, Pontchâteau, Saffré, Saint-Gildas-des-Bois, Saint-Nicolas-de-Redon, Sévérac
Maine-et-LoireSee the 4 communes
Bouillé-Ménard, Le Lion-d'Angers, Segré-en-Anjou Bleu, Thorigné-d'Anjou
MayenneSee the 4 communes
Changé, La Roche-Neuville, Laval, Saint-Jean-sur-Mayenne
This flood's data
In every file of the dataset, this flood carries the identifier EV-20250123-20250205-35.
The full dataset is released on 13 October at 6:00 (Paris time). Until then, we send it on request: presse@animalert.app.
Ask for the datasetpublic on 13 October at 6:00Recognised and listed
Public on data.gouv.fr on 13 October at 6:00
A project labelled by the French StateNational Resilience Day 2026 (Journée nationale de la résilience)
Registered with GBIFDerived dataset, DOI 10.15468/dd.ta4vkx