HydroBASINS lev08 watershed · #7080381840
Bassin de Rivière Saint-Louis
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 : Le Bas-Richelieu, Les Maskoutains, Nicolet-Yamaska
Sub-basin area
214,6km²
Upstream area
214,6km²
Discharge
4,18m³/s
Mean elev.
19m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 169.6 km²78.8% of basin
- 45.3 km²21.0% of basin
- 0.4 km²0.2% of basin
5 intersecting protected areas
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.47 km² overlap
Natural Area Under Private Stewardship
0.23 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.14 km² overlap
Habitat of a threatened or vulnerable plant species
0.05 km² overlap
Water fowl gathering area
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
593 distinct species · 80 379 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Rivière Saint-Louis : 20 espèces reliées par 80 interactions GloBI sur 3 types (connectance 16.1%, filtre Serrano α=0.2). 12 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
5,5°C
Annual rain
979mm
Moisture idx (CMI)
0,15
Runoff
614mm/an
PET
830mm
AET
650mm
Mean slope
0,3°
Water table
13cm
Forest
39%
Crops
63%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)