HydroBASINS lev08 watershed · #7080016000
Bassin de Snohomish 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 : Snohomish
Sub-basin area
105,2km²
Upstream area
4 532,3km²
Discharge
248,77m³/s
Mean elev.
47m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de Pilchuck River408 km²
- Bassin de Snohomish River64 km²
1 dept-equivalent regions (GADM L2)
- 104.9 km²99.4% of basin
5 intersecting protected areas
Skagit-Snoqualmie
IUCN VWildlife Area Complex
2.00 km² overlap
Snohomish River Estuary
IUCN Not AssignedEstuary
0.91 km² overlap
Spencer Island
IUCN VLocal Conservation Area
0.55 km² overlap
Reserve Program
0.24 km² overlap
Easement
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 387 distinct species · 197 012 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 Snohomish River : 19 espèces reliées par 72 interactions GloBI sur 3 types (connectance 14.5%, filtre Serrano α=0.2). 13 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°
10,4°C
Annual rain
1 018mm
Moisture idx (CMI)
0,19
Runoff
984mm/an
PET
818mm
AET
592mm
Mean slope
2,2°
Water table
163cm
Forest
43%
Crops
6%
Urban
55%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)