HydroBASINS lev08 watershed · #7080327430
Bassin de Big Coulee
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 : Benson, Cavalier, Ramsey, Towner
Sub-basin area
565,9km²
Upstream area
2 593,4km²
Discharge
1,32m³/s
Mean elev.
453m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Mauvais Coulee1151 km²
- Bassin · #7080321760877 km²
4 dept-equivalent regions (GADM L2)
- 188.4 km²33.2% of basin
- Ramsey155.3 km²27.4% of basin
- 132.0 km²23.3% of basin
- 91.9 km²16.2% of basin
11 intersecting protected areas
Lake Alice
IUCN IVNational Wildlife Refuge
49.15 km² overlap
Silver Lake
IUCN VNational Wildlife Refuge
8.30 km² overlap
Reserve Program
5.74 km² overlap
Reserve Program
2.38 km² overlap
Ramsey County
IUCN VIWaterfowl Production Area
2.03 km² overlap
Benson County
IUCN IVWaterfowl Production Area
1.86 km² overlap
Reserve Program
1.43 km² overlap
Cavalier County
IUCN VIWaterfowl Production Area
1.21 km² overlap
Watershed Protection
1.18 km² overlap
2 more protected areassorted by overlap area
Towner County
IUCN VIWaterfowl Production Area
0.65 km² overlap
Wetlands Reserve Program (WRP)
IUCN Not AssignedReserve Program
0.22 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
286 distinct species · 6 834 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Coulee : 25 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 67 interactions GloBI sur 4 types (connectance 13.5%, filtre Serrano α=0.2). 7 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°
3,3°C
Annual rain
437mm
Moisture idx (CMI)
-0,49
Runoff
26mm/an
PET
850mm
AET
381mm
Mean slope
0,1°
Water table
1cm
Forest
2%
Crops
74%
Urban
0%
Protected
9%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)