HydroBASINS lev08 watershed · #7080393220
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 2 administrative regions : Communauté-Urbaine-de-Montréal, L'Assomption
Sub-basin area
24,6km²
Upstream area
5 655,6km²
Discharge
104,13m³/s
Mean elev.
13m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Rivière Mascouche1368 km²
- Bassin de Rivière L'Assomption189 km²
2 dept-equivalent regions (GADM L2)
- 14.3 km²58.2% of basin
- 1.1 km²4.6% of basin
14 intersecting protected areas
Water fowl gathering area
2.75 km² overlap
Water fowl gathering area
2.46 km² overlap
Water fowl gathering area
1.28 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.66 km² overlap
Natural Area Under Private Stewardship
0.66 km² overlap
Pointe-aux-Prairies Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.36 km² overlap
Muskrat habitat
0.22 km² overlap
Natural Area Under Private Stewardship
0.19 km² overlap
Natural Area Under Private Stewardship
0.14 km² overlap
5 more protected areassorted by overlap area
Natural Area Under Private Stewardship
0.10 km² overlap
Muskrat habitat
0.09 km² overlap
Muskrat habitat
0.09 km² overlap
Natural Area Under Private Stewardship
0.03 km² overlap
Water fowl gathering area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 355 distinct species · 241 634 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 Fleuve Saint-Laurent : 23 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 130 interactions GloBI sur 4 types (connectance 17.5%, filtre Serrano α=0.2). 16 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°
6,1°C
Annual rain
972mm
Moisture idx (CMI)
0,13
Runoff
585mm/an
PET
842mm
AET
649mm
Mean slope
0,5°
Water table
26cm
Forest
2%
Crops
20%
Urban
75%
Protected
27%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)