HydroBASINS lev08 watershed · #2080534880
Bassin de l'Ain
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 1 administrative regions : Ain
Sub-basin area
177,2km²
Upstream area
3 605,1km²
Discharge
115,96m³/s
Mean elev.
240m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 3 basins
- Bassin de l'Albarine331 km²
- Bassin de la Cozance85 km²
- Bassin de Bief de Nanchez75 km²
1 dept-equivalent regions (GADM L2)
- 177.6 km²100.0% of basin
24 communes (GADM L5)Available for FRA, RWA
- Chazey-sur-Ain22.29 km²100% commune
- Villieu-Loyes-Mollon15.88 km²100% commune
- Leyment12.65 km²88% commune
- Crans12.17 km²91% commune
- Loyettes11.67 km²55% commune
- Châtillon-la-Palud11.53 km²80% commune
- Saint-Jean-de-Niost11.01 km²78% commune
- Meximieux10.85 km²80% commune
- Chalamont9.84 km²30% commune
- Saint-Maurice-de-Gourdans9.47 km²36% commune
- Blyes8.96 km²100% commune
- Saint-Maurice-de-Rémens7.82 km²74% commune
- Rignieux-le-Franc7.38 km²48% commune
- Sainte-Julie6.94 km²62% commune
- Saint-Vulbas6.05 km²27% commune
- Charnoz-sur-Ain6.04 km²92% commune
- Ambutrix2.52 km²50% commune
- Villette-sur-Ain0.93 km²5% commune
- Pérouges0.84 km²4% commune
- Saint-Denis-en-Bugey0.79 km²31% commune
- Châtenay0.62 km²4% commune
- Château-Gaillard0.57 km²4% commune
- Lagnieu0.40 km²1% commune
- Vaux-en-Bugey0.37 km²4% commune
8 intersecting protected areas
Basse vallée de l'Ain, confluence Ain-Rhône
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
20.32 km² overlap
La Dombes
IUCN Not ReportedSpecial Protection Area (Birds Directive)
9.54 km² overlap
La Dombes
IUCN Not ReportedWetland of International Importance (Ramsar Site)
9.54 km² overlap
La Dombes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
9.54 km² overlap
Brotteaux De Chazey Sur Ain
IUCN IVBiotope Protection Order
1.14 km² overlap
Steppes de La Valbonne
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.38 km² overlap
Steppes de la Valbonne
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.38 km² overlap
Land acquired by a regional conservatory of natural areas
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 041 distinct species · 92 047 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 l'Ain : 36 espèces + 3 bulles famille, 77 interactions GloBI documentées sur 4 types (connectance 10.4%, filtre Serrano α=0.2). Les 3 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°
11,2°C
Annual rain
848mm
Moisture idx (CMI)
-0,07
Runoff
553mm/an
PET
911mm
AET
672mm
Mean slope
1,5°
Water table
92cm
Forest
19%
Crops
51%
Urban
6%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)