HydroBASINS lev08 watershed · #7080274120
Bassin de Big Grass 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 3 administrative regions : Division No. 15, Division No. 17, Division No. 8
Sub-basin area
2 432,3km²
Upstream area
2 432,3km²
Discharge
3,06m³/s
Mean elev.
314m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 1755.5 km²71.9% of basin
- 344.4 km²14.1% of basin
- 340.9 km²14.0% of basin
21 intersecting protected areas
National Park
52.89 km² overlap
Wildlife Management Area
14.81 km² overlap
Wildlife Management Area
10.41 km² overlap
Privately Protected Area
5.03 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
1.29 km² overlap
Privately Protected Area
0.67 km² overlap
NE-24-017-16 W
IUCN IVPrivate Land
0.67 km² overlap
Johnson - MHHC
IUCN IVPrivate Land
0.67 km² overlap
Wilson - MHHC
IUCN IVPrivate Land
0.66 km² overlap
12 more protected areassorted by overlap area
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.66 km² overlap
SE-02-018-11 W
IUCN IVPrivate Land
0.65 km² overlap
NW-01-018-11 W
IUCN IVPrivate Land
0.65 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.65 km² overlap
NE-01-018-11 W
IUCN IVPrivate Land
0.65 km² overlap
NW-17-017-10 W
IUCN IVPrivate Land
0.65 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.64 km² overlap
Seddon - MHHC
IUCN IVPrivate Land
0.53 km² overlap
MHHC 6330-746
IUCN Not ReportedConservation Agreement
0.45 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.33 km² overlap
E 1/2 SW-02-018-11 W
IUCN IVPrivate Land
0.33 km² overlap
MHHC 6330-744
IUCN Not ReportedConservation Agreement
0.19 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
557 distinct species · 15 281 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Big Grass River : 19 espèces reliées par 79 interactions GloBI sur 3 types (connectance 18.2%, 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°
1,9°C
Annual rain
471mm
Moisture idx (CMI)
-0,39
Runoff
41mm/an
PET
772mm
AET
408mm
Mean slope
0,4°
Water table
4cm
Forest
21%
Crops
46%
Urban
0%
Protected
8%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)