HydroBASINS lev08 watershed · #7080400390
Bassin de Rivière Richelieu
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 5 administrative regions across 2 countries : Grand Isle, La Vallée-du-Richelieu, Le Haut-Richelieu, Les Jardins-de-Napierville, Rouville
Sub-basin area
586,1km²
Upstream area
21 914,4km²
Discharge
421,77m³/s
Mean elev.
36m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Rivière Lacolle135 km²
- Bassin de Rivière Richelieu67 km²
5 dept-equivalent regions (GADM L2)
- 526.4 km²89.6% of basin
- 35.6 km²6.1% of basin
- 20.6 km²3.5% of basin
- 4.9 km²0.8% of basin
- 0.1 km²0.0% of basin
30 intersecting protected areas
Natural Area Under Private Stewardship
5.57 km² overlap
Proposed biodiversity reserve
4.57 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.90 km² overlap
Ecological reserve
0.65 km² overlap
Natural Area Under Private Stewardship
0.58 km² overlap
Fort Lennox National Historic Site
IUCN Not ApplicableNational Historic Site
0.56 km² overlap
Natural Area Under Private Stewardship
0.53 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.47 km² overlap
rivière du Sud (partie Valiquette / Grenon / Humeniuk) Natural Area Under Private Stewardship
IUCN VINatural Area Under Private Stewardship
0.45 km² overlap
21 more protected areassorted by overlap area
Natural Area Under Private Stewardship
0.30 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.19 km² overlap
Rivière-Bleury (Sec. CIME / Par. Ferme-Simard) Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.17 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.16 km² overlap
Natural Area Under Private Stewardship
0.14 km² overlap
Natural Area Under Private Stewardship
0.12 km² overlap
Natural Area Under Private Stewardship
0.12 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.12 km² overlap
Îles Saint-Jean Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.12 km² overlap
Habitat of a threatened or vulnerable plant species
0.11 km² overlap
Natural Area Under Private Stewardship
0.11 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.10 km² overlap
Îles du Fort-Lennox Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.08 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.08 km² overlap
Natural Area Under Private Stewardship
0.08 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.07 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.06 km² overlap
Natural Area Under Private Stewardship
0.06 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.05 km² overlap
rivière du Sud (partie Entreprises Saint-Jean) Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.05 km² overlap
Natural Area Under Private Stewardship
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 483 distinct species · 769 591 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Richelieu : 19 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 66 interactions GloBI sur 3 types (connectance 17.5%, 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°
6,5°C
Annual rain
932mm
Moisture idx (CMI)
0,08
Runoff
608mm/an
PET
852mm
AET
662mm
Mean slope
0,3°
Water table
13cm
Forest
25%
Crops
66%
Urban
12%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)