HydroBASINS lev08 watershed · #7080341710
Bassin de North Fork Tolt 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 2 administrative regions : King, Snohomish
Sub-basin area
335,4km²
Upstream area
335,4km²
Discharge
16,79m³/s
Mean elev.
531m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- King334.6 km²99.5% of basin
- 1.8 km²0.5% of basin
14 intersecting protected areas
Snoqualmie Bog
IUCN VNatural Area Preserve
205.44 km² overlap
Watersheds
18.10 km² overlap
Watershed
15.50 km² overlap
Watershed
14.21 km² overlap
Girl Scouts
IUCN Not AssignedConservation Easement
1.48 km² overlap
Moss Lake
IUCN VNatural Area
0.26 km² overlap
Tolt River
IUCN VConservation Land
0.19 km² overlap
King County Easement 0225079033
IUCN Not AssignedEasement
0.06 km² overlap
Tolt Unnamed Creek
IUCN VConservation Land
0.05 km² overlap
5 more protected areassorted by overlap area
King County Easement 0625089002
IUCN Not AssignedEasement
0.04 km² overlap
Moran 2012
IUCN VEnvironmental System
0.03 km² overlap
Griffin Creek
IUCN Not AssignedNatural Area
0.01 km² overlap
Griffin Creek Natural Area 2
IUCN Not AssignedNatural Area
0.00 km² overlap
King County Easement 1525079074
IUCN Not AssignedEasement
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
819 distinct species · 40 579 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 North Fork Tolt River : 28 espèces reliées par 73 interactions GloBI sur 4 types (connectance 8.9%, 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°
7,9°C
Annual rain
2 030mm
Moisture idx (CMI)
0,61
Runoff
1 571mm/an
PET
773mm
AET
661mm
Mean slope
13,3°
Water table
541cm
Forest
97%
Crops
0%
Urban
0%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)