HydroBASINS lev08 watershed · #2080535770
Bassin de la Loire
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 4 administrative regions : Haute-Loire, Loire, Puy-de-Dôme, Rhône
Sub-basin area
1 880,6km²
Upstream area
5 113,3km²
Discharge
50,28m³/s
Mean elev.
620m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Ance540 km²
- Bassin de la Loire10 km²
4 dept-equivalent regions (GADM L2)
- 1425.2 km²75.6% of basin
- 266.6 km²14.1% of basin
- 188.6 km²10.0% of basin
- 4.6 km²0.2% of basin
164 communes (GADM L5)Available for FRA, RWA
- Saint-Étienne65.84 km²82% commune
- Saint-Genest-Malifaux47.20 km²99% commune
- Saint-Just-Saint-Rambert40.90 km²100% commune
- Monistrol-sur-Loire40.85 km²85% commune
- Larajasse33.37 km²98% commune
- Bas-en-Basset32.68 km²71% commune
- Marlhes31.96 km²98% commune
- Périgneux31.89 km²100% commune
- Saint-Maurice-en-Gourgois31.57 km²100% commune
- Saint-Héand31.13 km²100% commune
- Saint-Marcellin-en-Forez31.13 km²100% commune
- Saint-Martin-en-Haut28.62 km²73% commune
- Panissières26.23 km²100% commune
- Saint-Didier-en-Velay25.90 km²100% commune
- Sury-le-Comtal24.81 km²100% commune
- Saint-Just-Malmont23.73 km²100% commune
- Aurec-sur-Loire22.80 km²100% commune
- Feurs21.52 km²88% commune
- Saint-Romain-le-Puy21.39 km²100% commune
- La Fouillouse21.38 km²100% commune
- Chazelles-sur-Lyon21.12 km²96% commune
- Luriecq20.87 km²100% commune
- Malvalette20.71 km²100% commune
- Saint-Galmier19.70 km²100% commune
- Saint-Cyr-les-Vignes19.53 km²100% commune
- Bellegarde-en-Forez19.42 km²100% commune
- Chambles19.15 km²100% commune
- Saint-Hilaire-Cusson-la-Valmitte18.43 km²98% commune
- Boisset-Saint-Priest17.84 km²100% commune
- Chalain-le-Comtal17.80 km²93% commune
- Roche-la-Molière17.66 km²100% commune
- Le Chambon-Feugerolles17.53 km²100% commune
- Valeille16.88 km²100% commune
- Sainte-Sigolène16.85 km²55% commune
- Saint-Jean-Soleymieux16.53 km²100% commune
- Verrières-en-Forez16.41 km²78% commune
- Saint-Martin-Lestra16.14 km²100% commune
- Saint-Christo-en-Jarez16.07 km²73% commune
- Saint-Nizier-de-Fornas16.04 km²100% commune
- Gumières16.01 km²99% commune
- Haute-Rivoire16.00 km²76% commune
- Chambost-Longessaigne15.73 km²100% commune
- Précieux15.73 km²96% commune
- Andrézieux-Bouthéon15.64 km²100% commune
- Saint-Laurent-la-Conche15.14 km²100% commune
- Saint-Victor-Malescours14.97 km²100% commune
- Chevrières14.48 km²100% commune
- Marols14.46 km²100% commune
- Saint-Romain-les-Atheux14.37 km²100% commune
- Rozier-Côtes-d'Aurec14.14 km²100% commune
- Cottance14.11 km²100% commune
- Pomeys13.45 km²100% commune
- Saint-Romain-Lachalm13.16 km²67% commune
- Civens13.13 km²100% commune
- Saint-Genest-Lerpt13.03 km²100% commune
- Lézigneux13.02 km²88% commune
- L'Hôpital-le-Grand12.99 km²100% commune
- Saint-Bonnet-les-Oules12.98 km²100% commune
- Violay12.86 km²46% commune
- Planfoy12.37 km²100% commune
- La Chapelle-d'Aurec12.33 km²100% commune
- Saint-Clément-les-Places12.32 km²98% commune
- Virigneux12.26 km²100% commune
- Cuzieu11.36 km²100% commune
- Veauche11.25 km²100% commune
- Tarentaise11.22 km²91% commune
- Magneux-Haute-Rive11.19 km²90% commune
- Saint-Barthélemy-Lestra11.16 km²100% commune
- Salvizinet11.07 km²100% commune
- Saint-Denis-sur-Coise10.95 km²100% commune
- Saint-Ferréol-d'Auroure10.90 km²100% commune
- Chambœuf10.87 km²100% commune
- Chambéon10.80 km²63% commune
- Jonzieux10.51 km²100% commune
- Saint-Médard-en-Forez10.44 km²100% commune
- Firminy10.39 km²100% commune
- Montrond-les-Bains10.03 km²100% commune
- Grézieux-le-Fromental9.81 km²91% commune
- Longessaigne9.79 km²80% commune
- Chazelles-sur-Lavieu9.64 km²100% commune
- Saint-Georges-Haute-Ville9.56 km²100% commune
- Soleymieux9.53 km²100% commune
- Chenereilles9.52 km²100% commune
- Sorbiers9.51 km²80% commune
- Salt-en-Donzy9.20 km²100% commune
- Aveizieux9.18 km²100% commune
- Coise9.07 km²100% commune
- Marcenod8.86 km²98% commune
- Unieux8.85 km²100% commune
- Marclopt8.75 km²100% commune
- Aboën8.72 km²100% commune
- Montchal8.71 km²100% commune
- Saint-André-le-Puy8.54 km²100% commune
- Pont-Salomon8.45 km²100% commune
- L'Étrat8.34 km²100% commune
- Craintilleux8.21 km²100% commune
- Boisset-lès-Montrond8.03 km²100% commune
- La Séauve-sur-Semène8.01 km²100% commune
- Grammond7.99 km²100% commune
- La Talaudière7.83 km²100% commune
- Villechenève7.70 km²53% commune
- Margerie-Chantagret7.70 km²100% commune
- Veauchette7.56 km²100% commune
- Maringes7.37 km²79% commune
- Sainte-Catherine7.36 km²55% commune
- Saint-Cyprien7.20 km²100% commune
- Fontanès7.12 km²100% commune
- Essertines-en-Donzy7.09 km²100% commune
- La Ricamarie6.93 km²100% commune
- La Chapelle-sur-Coise6.85 km²100% commune
- Aveize6.39 km²38% commune
- Valprivas6.09 km²27% commune
- Duerne6.04 km²55% commune
- Jas5.90 km²100% commune
- Rozier-en-Donzy5.85 km²61% commune
- La Tourette5.54 km²100% commune
- Unias5.41 km²100% commune
- Villars5.34 km²100% commune
- Caloire5.17 km²100% commune
- La Tour-en-Jarez5.09 km²100% commune
- Bonson5.05 km²100% commune
- Saint-Pal-de-Mons5.00 km²18% commune
- Rivas4.79 km²100% commune
- Fraisses4.42 km²100% commune
- Lavieu4.35 km²100% commune
- Saint-Symphorien-sur-Coise3.96 km²100% commune
- Meys3.81 km²27% commune
- Saint-Paul-en-Cornillon3.66 km²100% commune
- Saint-Jean-Bonnefonds3.50 km²30% commune
- Sainte-Agathe-en-Donzy3.27 km²99% commune
- Grézieu-le-Marché3.24 km²29% commune
- La Gimond3.17 km²100% commune
- Les Villettes3.16 km²27% commune
- Saint-Priest-en-Jarez3.05 km²100% commune
- Estivareilles2.85 km²12% commune
- Châtelus2.48 km²100% commune
- Le Bessat2.45 km²25% commune
- Saint-Clément-de-Valorgue2.32 km²17% commune
- Saint-André-la-Côte2.22 km²45% commune
- Saint-Anthème2.11 km²3% commune
- Saint-Régis-du-Coin2.07 km²10% commune
- Saint-Laurent-de-Chamousset1.94 km²11% commune
- Saint-Bonnet-le-Château1.76 km²100% commune
- Saint-Thomas-la-Garde1.58 km²45% commune
- Merle-Leignec1.28 km²8% commune
- Pouilly-lès-Feurs1.16 km²9% commune
- Riotord1.04 km²2% commune
- Écotay-l'Olme0.88 km²14% commune
- Poncins0.53 km²3% commune
- Montromant0.52 km²5% commune
- La Chapelle-en-Lafaye0.51 km²6% commune
- Montbrison0.42 km²2% commune
- Bussières0.39 km²2% commune
- Viricelles0.36 km²19% commune
- Épercieux-Saint-Paul0.31 km²4% commune
- Saint-Romain-en-Jarez0.23 km²1% commune
- Affoux0.20 km²2% commune
- La Chaulme0.19 km²1% commune
- La Versanne0.18 km²1% commune
- Cleppé0.16 km²1% commune
- Montarcher0.09 km²2% commune
- Mornand-en-Forez0.07 km²0% commune
- Thélis-la-Combe0.05 km²0% commune
- Bard0.04 km²0% commune
24 intersecting protected areas
Plaine du Forez
IUCN Not ReportedSpecial Protection Area (Birds Directive)
156.43 km² overlap
Pilat
IUCN VRegional Nature Park
142.53 km² overlap
Gorges de la Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
67.10 km² overlap
Pelouses, landes et habitats rocheux des Gorges de la Loire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
25.00 km² overlap
Gorges de la Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
25.00 km² overlap
Milieux alluviaux et aquatiques de la Loire
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
15.82 km² overlap
Livradois-Forez
IUCN VRegional Nature Park
4.85 km² overlap
Vallée de l'Ondenon, contreforts nord du Pilat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.56 km² overlap
Écozone du Forez
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.89 km² overlap
15 more protected areassorted by overlap area
Gorges De La Loire
IUCN IVRegional Nature Reserve
3.58 km² overlap
Tourbières du Pilat et landes de Chaussitre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.14 km² overlap
Chaussitre Et Gimel
IUCN IVForest Managed Biological Reserve
1.34 km² overlap
bois du roy
IUCN IVLand acquired by a regional conservatory of natural areas
1.01 km² overlap
Etangs du Forez
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.65 km² overlap
Biotope Protection Order
0.28 km² overlap
Etang De La Ronze
IUCN IVBiotope Protection Order
0.24 km² overlap
Lignon, Vizezy, Anzon et leurs affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.16 km² overlap
Crêts du Pilat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.16 km² overlap
Parties sommitales du Forez et hautes chaumes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.14 km² overlap
Etang Des Plantées
IUCN IVBiotope Protection Order
0.12 km² overlap
sources du gournier
IUCN IVLand acquired by a regional conservatory of natural areas
0.05 km² overlap
suc de lavieu
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Site à chiroptères des Monts du Matin
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.01 km² overlap
col des limites
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 983 distinct species · 737 044 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de la Loire : 29 espèces + 5 bulles famille, 52 interactions GloBI documentées sur 7 types (connectance 9.3%, filtre Serrano α=0.2). Les 5 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
9,5°C
Annual rain
784mm
Moisture idx (CMI)
-0,08
Runoff
296mm/an
PET
850mm
AET
636mm
Mean slope
5,9°
Water table
342cm
Forest
29%
Crops
30%
Urban
13%
Protected
8%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)