HydroBASINS lev08 watershed · #7080412510

Bassin de Saint Lawrence River

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 4 administrative regions across 2 countries : Lake Ontario, Leeds and Grenville, Saint Lawrence, Stormont, Dundas and Glengarry

143% lakePfafstetter: 72551050

Sub-basin area

1 059,7km²

Upstream area

771 674,6km²

Discharge

7 855,47m³/s

Mean elev.

83m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Grays Creek45 km²

▲ Receives from 2 basins

Bassin de Saint Lawrence River1024 km²
Bassin de Oswegatchie River75 km²

4 dept-equivalent regions (GADM L2)

Stormont, Dundas and Glengarry
Ontario · Canada
439.7 km²
41.4% of basin
Saint Lawrence
New York · United States
424.1 km²
39.9% of basin
Lake Ontario
New York · United States
127.6 km²
12.0% of basin
Leeds and Grenville
Ontario · Canada
65.0 km²
6.1% of basin

12 intersecting protected areas

Upper Canada Bird Sanctuary
IUCN III
Migratory Bird Sanctuary
26.04 km² overlap
Wilson Hill
IUCN V
Wildlife Management Area
14.13 km² overlap
Wetlands Reserve Program (WRP), St. Lawrence, NY
IUCN V
Reserve Program
7.33 km² overlap
Dupont Provincial Park (Nature Reserve Class)
IUCN Ia
Provincial Park
6.15 km² overlap
DUC Fee Simple Lands
IUCN IV
Ownership by Environmental Non-Governmental Organization
2.29 km² overlap
Two Creeks Forest Conservation Area
IUCN IV
Conservation Area
1.96 km² overlap
DUC Fee Simple Lands
IUCN IV
Ownership by Environmental Non-Governmental Organization
1.84 km² overlap
Hoasic Creek Wetland
IUCN IV
Conservation Area
1.31 km² overlap
New York
IUCN V
State Lands
0.56 km² overlap

3 more protected areassorted by overlap area

DUC Fee Simple Lands
IUCN IV
Ownership by Environmental Non-Governmental Organization
0.29 km² overlap
Lisbon
IUCN V
Forest Preserve
0.11 km² overlap
Waddington
IUCN V
Forest Preserve
0.03 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

2 292 distinct species · 560 354 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de Saint Lawrence River : 18 espèces reliées par 72 interactions GloBI sur 3 types (connectance 19.0%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.191

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

6,3°C

Annual rain

900mm

Moisture idx (CMI)

0,06

Runoff

487mm/an

PET

843mm

AET

644mm

Mean slope

0,7°

Water table

33cm

Forest

73%

Crops

24%

Urban

Protected

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)