HydroBASINS lev08 watershed · #7080401250
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 : Communauté-Urbaine-de-Montréal, Les Jardins-de-Napierville, Roussillon
Sub-basin area
207,8km²
Upstream area
932 686,5km²
Discharge
10 043,94m³/s
Mean elev.
30m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Trout River2467 km²
- Bassin de Fleuve Saint-Laurent67 km²
3 dept-equivalent regions (GADM L2)
- 100.7 km²48.4% of basin
- 56.6 km²27.2% of basin
- 4.3 km²2.1% of basin
14 intersecting protected areas
Water fowl gathering area
10.55 km² overlap
Île aux Hérons Bird Sanctuary
IUCN IIIMigratory Bird Sanctuary
6.30 km² overlap
Water fowl gathering area
4.16 km² overlap
Water fowl gathering area
3.92 km² overlap
Water fowl gathering area
2.64 km² overlap
Water fowl gathering area
2.60 km² overlap
Water fowl gathering area
2.29 km² overlap
Water fowl gathering area
1.90 km² overlap
Recognized nature reserve
0.51 km² overlap
5 more protected areassorted by overlap area
Water fowl gathering area
0.38 km² overlap
Water fowl gathering area
0.05 km² overlap
Habitat of a threatened or vulnerable plant species
0.01 km² overlap
Island or peninsula inhabited by a colony of birds
0.01 km² overlap
Island or peninsula inhabited by a colony of birds
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 198 distinct species · 919 778 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 Fleuve Saint-Laurent : 21 espèces reliées par 73 interactions GloBI sur 3 types (connectance 15.7%, filtre Serrano α=0.2). 10 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°
6,5°C
Annual rain
950mm
Moisture idx (CMI)
0,11
Runoff
569mm/an
PET
843mm
AET
650mm
Mean slope
0,3°
Water table
12cm
Forest
23%
Crops
36%
Urban
29%
Protected
14%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)