HydroBASINS lev08 watershed · #7080382860
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 : La Vallée-du-Richelieu, Lajemmerais, Le Bas-Richelieu, Les Maskoutains, Rouville
Sub-basin area
802,1km²
Upstream area
23 717,7km²
Discharge
455,8m³/s
Mean elev.
24m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
5 dept-equivalent regions (GADM L2)
- 394.6 km²49.1% of basin
- 179.6 km²22.3% of basin
- 143.7 km²17.9% of basin
- 73.4 km²9.1% of basin
- 12.4 km²1.5% of basin
23 intersecting protected areas
Migratory Bird Sanctuary
3.17 km² overlap
Recognized nature reserve
2.72 km² overlap
Quebec's national park
1.96 km² overlap
Bois-des-Patriotes Nature Reserve
IUCN Not ReportedRecognized nature reserve
1.06 km² overlap
Bois-des-Patriotes (Par. Mathieu-Nord) Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.93 km² overlap
Recognized nature reserve
0.45 km² overlap
Piémont-du-Mont-Saint-Hilaire (Sec. Ville de Mont-St-Hilaire / 9 parcelles) Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.27 km² overlap
Île-Jeannotte Nature Reserve
IUCN IVRecognized nature reserve
0.12 km² overlap
Natural Area Under Private Stewardship
0.12 km² overlap
14 more protected areassorted by overlap area
Recognized nature reserve
0.08 km² overlap
Mont-Saint-Bruno Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.08 km² overlap
Recognized nature reserve
0.08 km² overlap
Piémont-du-Mont-Saint-Hilaire (Sec. CNQ / Par. Soeurs-de-la-Présentation-de-Marie (achat)) Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.07 km² overlap
piémont du Mont Saint-Hilaire (partie ville de Saint-Hilaire -servitude-) Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.07 km² overlap
Coulée-des-Érables Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.05 km² overlap
Académie-des-Sacrés-Coeurs Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.05 km² overlap
Recognized nature reserve
0.04 km² overlap
Quatre-Temps (secteur Nature-Action Québec) Natural reserve
IUCN Not ReportedRecognized nature reserve
0.03 km² overlap
Natural Area Under Private Stewardship
0.03 km² overlap
mont Saint-Bruno (partie municipalité de Sainte-Julie - servitude) Natural Area Under Private Stewardship
IUCN Not ReportedNatural Area Under Private Stewardship
0.02 km² overlap
Namasté Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.02 km² overlap
Natural Area Under Private Stewardship
0.00 km² overlap
Natural Area Under Private Stewardship
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 578 distinct species · 314 576 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 124 interactions GloBI sur 4 types (connectance 17.6%, filtre Serrano α=0.2). 15 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°
5,8°C
Annual rain
977mm
Moisture idx (CMI)
0,14
Runoff
604mm/an
PET
837mm
AET
652mm
Mean slope
0,6°
Water table
44cm
Forest
43%
Crops
55%
Urban
9%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)