HydroBASINS lev08 watershed · #2080526040
Bassin de la Petite Grosne
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 3 administrative regions : Ain, Rhône, Saône-et-Loire
Sub-basin area
234,8km²
Upstream area
26 700,9km²
Discharge
482,85m³/s
Mean elev.
298m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Veyle667 km²
- Bassin de la Saône373 km²
3 dept-equivalent regions (GADM L2)
- 162.5 km²69.0% of basin
- 52.3 km²22.2% of basin
- 20.6 km²8.8% of basin
44 communes (GADM L5)Available for FRA, RWA
- Cenves20.62 km²77% commune
- Pierreclos12.09 km²100% commune
- Charnay-lès-Mâcon11.86 km²97% commune
- Prissé10.94 km²100% commune
- Illiat10.59 km²51% commune
- La Roche-Vineuse9.93 km²85% commune
- Cormoranche-sur-Saône9.79 km²100% commune
- Serrières9.59 km²100% commune
- Crêches-sur-Saône9.47 km²100% commune
- Garnerans8.66 km²100% commune
- Mâcon8.63 km²32% commune
- Sologny8.56 km²78% commune
- Saint-Didier-sur-Chalaronne7.81 km²31% commune
- Grièges7.42 km²48% commune
- Solutré-Pouilly6.12 km²100% commune
- Verzé5.90 km²28% commune
- Vergisson5.58 km²100% commune
- Berzé-la-Ville5.34 km²99% commune
- Cruzilles-lès-Mépillat5.27 km²44% commune
- Fuissé4.99 km²100% commune
- Varennes-lès-Mâcon4.78 km²100% commune
- Leynes4.72 km²100% commune
- Davayé4.27 km²100% commune
- Vinzelles4.23 km²100% commune
- Bussières3.98 km²100% commune
- Chevagny-les-Chevrières3.97 km²100% commune
- La Chapelle-de-Guinchay3.94 km²31% commune
- Chaintré3.13 km²100% commune
- Berzé-le-Châtel2.86 km²53% commune
- Milly-Lamartine2.73 km²100% commune
- Chasselas2.70 km²100% commune
- Saint-Amour-Bellevue2.67 km²54% commune
- Bey2.62 km²100% commune
- Chânes2.54 km²100% commune
- Pruzilly2.33 km²53% commune
- Saint-Vérand2.31 km²98% commune
- Hurigny1.22 km²13% commune
- Saint-Point0.52 km²4% commune
- Saint-Symphorien-d'Ancelles0.38 km²6% commune
- Tramayes0.18 km²1% commune
- Saint-Étienne-sur-Chalaronne0.12 km²1% commune
- Bourgvilain0.05 km²0% commune
- Cluny0.01 km²0% commune
- Juliénas0.00 km²0% commune
11 intersecting protected areas
Special Areas of Conservation (Habitats Directive)
5.20 km² overlap
Prairies humides et forêts alluviales du Val de Saône
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.91 km² overlap
Val de Saône
IUCN Not ReportedSpecial Protection Area (Birds Directive)
4.91 km² overlap
Prairies alluviales et milieux associés de Saône-et-Loire
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.70 km² overlap
Pelouses calcicoles du Mâconnais
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.60 km² overlap
la roche de vergisson
IUCN IVLand acquired by a regional conservatory of natural areas
0.46 km² overlap
Roche De Vergisson
IUCN IVBiotope Protection Order
0.36 km² overlap
la roche de solutre
IUCN IVLand acquired by a regional conservatory of natural areas
0.25 km² overlap
montsard
IUCN IVLand acquired by a regional conservatory of natural areas
0.22 km² overlap
2 more protected areassorted by overlap area
bois de fee (mont de leynes)
IUCN IVLand acquired by a regional conservatory of natural areas
0.20 km² overlap
Tunnel Du Bois Clair
IUCN IVBiotope Protection Order
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 754 distinct species · 105 613 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 Petite Grosne : 37 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) + 4 bulles famille, 91 interactions GloBI documentées sur 6 types (connectance 11.1%, filtre Serrano α=0.2). Les 4 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°
10,6°C
Annual rain
800mm
Moisture idx (CMI)
-0,07
Runoff
401mm/an
PET
865mm
AET
641mm
Mean slope
5,4°
Water table
264cm
Forest
17%
Crops
37%
Urban
13%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)