HydroBASINS lev08 watershed · #7080412990
Bassin de Grasse 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 : Franklin, Lake Ontario, Saint Lawrence, Stormont, Dundas and Glengarry
Sub-basin area
1 657,9km²
Upstream area
1 657,9km²
Discharge
32,93m³/s
Mean elev.
278m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- Saint LawrenceNew York · United States1652.4 km²99.5% of basin
- Lake OntarioNew York · United States4.1 km²0.2% of basin
- 2.9 km²0.2% of basin
- FranklinNew York · United States0.6 km²0.0% of basin
17 intersecting protected areas
Grasse River
IUCN VWild Forest
46.53 km² overlap
Cranberry Lake
IUCN IbWild Forest
14.51 km² overlap
Five Ponds
IUCN IbWilderness
7.68 km² overlap
Reserve Program
6.20 km² overlap
Horseshoe Lake
IUCN VWild Forest
3.63 km² overlap
Upper And Lower Lakes
IUCN VWildlife Management Area
3.44 km² overlap
Otterbrook Easement I
IUCN Not AssignedEasement
1.77 km² overlap
Local Conservation Area
0.45 km² overlap
New York
IUCN VState Lands
0.32 km² overlap
8 more protected areassorted by overlap area
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), St. Lawrence, NY
IUCN VConservation Easement
0.19 km² overlap
Indian Meadows
IUCN VForest Preserve
0.18 km² overlap
Cranberry
IUCN VILake
0.15 km² overlap
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), St. Lawrence, NY
IUCN VConservation Easement
0.07 km² overlap
Lisbon
IUCN VForest Preserve
0.02 km² overlap
Waddington
IUCN VForest Preserve
0.01 km² overlap
State
IUCN VForest Preserve
0.01 km² overlap
Wilson Hill
IUCN VWildlife Management Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 420 distinct species · 166 466 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Grasse River : 23 espèces reliées par 75 interactions GloBI sur 3 types (connectance 13.4%, filtre Serrano α=0.2). 11 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°
5,6°C
Annual rain
994mm
Moisture idx (CMI)
0,14
Runoff
626mm/an
PET
854mm
AET
683mm
Mean slope
2,6°
Water table
151cm
Forest
98%
Crops
8%
Urban
1%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)