HydroBASINS lev08 watershed · #7080382790
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 6 administrative regions : D'Autray, Joliette, L'Assomption, La Vallée-du-Richelieu, Lajemmerais +1
Sub-basin area
403,6km²
Upstream area
939 513,1km²
Discharge
10 164,71m³/s
Mean elev.
13m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
6 dept-equivalent regions (GADM L2)
- 135.4 km²33.5% of basin
- 32.8 km²8.1% of basin
- 25.6 km²6.3% of basin
- 8.9 km²2.2% of basin
- 8.7 km²2.2% of basin
- 0.0 km²0.0% of basin
30 intersecting protected areas
Water fowl gathering area
20.96 km² overlap
Water fowl gathering area
15.26 km² overlap
Water fowl gathering area
8.83 km² overlap
Water fowl gathering area
7.46 km² overlap
Water fowl gathering area
7.05 km² overlap
Muskrat habitat
6.25 km² overlap
Water fowl gathering area
5.78 km² overlap
Water fowl gathering area
5.50 km² overlap
Water fowl gathering area
4.45 km² overlap
21 more protected areassorted by overlap area
Water fowl gathering area
3.62 km² overlap
Water fowl gathering area
3.46 km² overlap
Ecological reserve
3.10 km² overlap
National Wildlife Area
2.98 km² overlap
Water fowl gathering area
2.96 km² overlap
Natural Area Under Private Stewardship
1.13 km² overlap
tourbière de Lanoraie (partie Corey/Rolland/Pagé) Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
1.09 km² overlap
Tourbière-Saint-Jean-Est Natural reserve
IUCN Not ReportedRecognized nature reserve
0.82 km² overlap
Natural Area Under Private Stewardship
0.64 km² overlap
Muskrat habitat
0.57 km² overlap
Recognized nature reserve
0.51 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.47 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.45 km² overlap
Natural Area Under Private Stewardship
0.43 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.43 km² overlap
Natural Area Under Private Stewardship
0.34 km² overlap
Natural Area Under Private Stewardship
0.33 km² overlap
Tourbière de Lanoraie (partie ferme Daniel Coutu Inc.) Natural Area Under Private Stewardship
IUCN IVNatural Area Under Private Stewardship
0.30 km² overlap
Water fowl gathering area
0.29 km² overlap
Habitat of a threatened or vulnerable plant species
0.29 km² overlap
Natural Area Under Private Stewardship
0.27 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 124 distinct species · 136 515 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 : 22 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 82 interactions GloBI sur 3 types (connectance 14.6%, 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°
5,7°C
Annual rain
969mm
Moisture idx (CMI)
0,14
Runoff
593mm/an
PET
837mm
AET
647mm
Mean slope
0,5°
Water table
34cm
Forest
23%
Crops
56%
Urban
6%
Protected
22%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)