HydroBASINS lev08 watershed · #7080013920
Bassin de Big 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 1 administrative regions : Mendocino
Sub-basin area
496,2km²
Upstream area
496,2km²
Discharge
12,75m³/s
Mean elev.
309m
Administrative coverage
1 dept-equivalent regions (GADM L2)
- 496.5 km²100.0% of basin
6 intersecting protected areas
Big River Salmon Creek
IUCN VPrivate Conservation
43.62 km² overlap
Montgomery Woods State
IUCN VNatural Reserve
10.89 km² overlap
Private Conservation
0.37 km² overlap
Marine Protected Area
0.32 km² overlap
Hans Jenny Pygmy
IUCN VForest Reserve
0.05 km² overlap
Pygmy
IUCN VForest Preserve
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 210 distinct species · 27 835 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 53 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 River : 41 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 77 interactions GloBI sur 5 types (connectance 5.6%, filtre Serrano α=0.2). 12 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°
11,8°C
Annual rain
1 195mm
Moisture idx (CMI)
0,05
Runoff
828mm/an
PET
1 138mm
AET
632mm
Mean slope
14,5°
Water table
504cm
Forest
100%
Crops
0%
Urban
0%
Protected
18%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)