HydroBASINS lev08 watershed · #7080380380
Bassin de Fleuve Saint-Laurent
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 : D'Autray, Le Bas-Richelieu, Nicolet-Yamaska
Sub-basin area
112,8km²
Upstream area
963 343,2km²
Discharge
10 599,18m³/s
Mean elev.
4m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
3 dept-equivalent regions (GADM L2)
- 49.7 km²44.0% of basin
- 7.5 km²6.7% of basin
- 2.3 km²2.1% of basin
30 intersecting protected areas
Water fowl gathering area
28.22 km² overlap
Water fowl gathering area
8.35 km² overlap
Water fowl gathering area
7.74 km² overlap
Natural Area Under Private Stewardship
4.57 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
1.78 km² overlap
Natural Area Under Private Stewardship
1.69 km² overlap
Muskrat habitat
1.63 km² overlap
Grande-Île Wildlife Preserve
IUCN IVWildlife preserve
1.14 km² overlap
Heronry
0.77 km² overlap
21 more protected areassorted by overlap area
Muskrat habitat
0.77 km² overlap
Muskrat habitat
0.70 km² overlap
Muskrat habitat
0.49 km² overlap
Natural Area Under Private Stewardship
0.43 km² overlap
Muskrat habitat
0.40 km² overlap
Muskrat habitat
0.30 km² overlap
Muskrat habitat
0.25 km² overlap
Natural Area Under Private Stewardship
0.24 km² overlap
Natural Area Under Private Stewardship
0.24 km² overlap
Natural Area Under Private Stewardship
0.22 km² overlap
Natural Area Under Private Stewardship
0.22 km² overlap
Natural Area Under Private Stewardship
0.21 km² overlap
Habitat of a threatened or vulnerable plant species
0.19 km² overlap
Natural Area Under Private Stewardship
0.16 km² overlap
Natural Area Under Private Stewardship
0.14 km² overlap
Natural Area Under Private Stewardship
0.13 km² overlap
Muskrat habitat
0.11 km² overlap
Natural Area Under Private Stewardship
0.10 km² overlap
Habitat of a threatened or vulnerable plant species
0.09 km² overlap
Île de Grace Natural reserve
IUCN IVRecognized nature reserve
0.08 km² overlap
Natural Area Under Private Stewardship
0.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
573 distinct species · 111 885 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Fleuve Saint-Laurent : 23 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 94 interactions GloBI sur 3 types (connectance 19.0%, filtre Serrano α=0.2). 9 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°
5,4°C
Annual rain
974mm
Moisture idx (CMI)
0,15
Runoff
603mm/an
PET
829mm
AET
646mm
Mean slope
0,2°
Water table
11cm
Forest
26%
Crops
54%
Urban
7%
Protected
39%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)