HydroBASINS lev08 watershed · #7080394680
Bassin de Willamette 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 : Clackamas, Multnomah
Sub-basin area
348,4km²
Upstream area
28 949km²
Discharge
1 098,69m³/s
Mean elev.
86m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Clackamas River2502 km²
- Bassin de Tualatin River1949 km²
2 dept-equivalent regions (GADM L2)
- 240.6 km²68.9% of basin
- 108.6 km²31.1% of basin
30 intersecting protected areas
Tryon Creek
IUCN VState Natural Area
2.66 km² overlap
River View
IUCN VNatural Area
0.59 km² overlap
Forest
IUCN IIIPark
0.45 km² overlap
Towle Butte
IUCN VNatural Area
0.36 km² overlap
West Bliss Butte
IUCN VNatural Area
0.35 km² overlap
Balch Creek
IUCN VForest
0.34 km² overlap
Scouters Mountain
IUCN VNature Park
0.34 km² overlap
East Bliss Butte
IUCN VNatural Area
0.21 km² overlap
Wahoo Creek
IUCN VNatural Area
0.15 km² overlap
21 more protected areassorted by overlap area
Upper Mitchell Creek
IUCN VNatural Area
0.14 km² overlap
Scouter Mountain
IUCN VNatural Area
0.12 km² overlap
Willamette Cove
IUCN VNatural Area
0.11 km² overlap
Deardorff Creek
IUCN VNatural Area
0.04 km² overlap
Lents
IUCN VNatural Area
0.03 km² overlap
Burright Local Share
IUCN VNatural Area
0.03 km² overlap
Unknown
IUCN VPark
0.03 km² overlap
Baltimore Woods
IUCN VNatural Area
0.03 km² overlap
Knapp Street Triangle
IUCN VNatural Area
0.03 km² overlap
Minthorn Springs
IUCN VWetlands Preserve
0.03 km² overlap
Minthorn Springs
IUCN VLocal Conservation Area
0.03 km² overlap
Oaks Crossing
IUCN VLocal Conservation Area
0.02 km² overlap
Veterans Creek
IUCN VNatural Area
0.02 km² overlap
Kelly Creek
IUCN VNatural Area
0.01 km² overlap
Unknown
IUCN VPark
0.01 km² overlap
Winsor Court
IUCN VWetlands Preserve
0.01 km² overlap
Windsor Court
IUCN VLocal Conservation Area
0.01 km² overlap
Cottonwood Creek
IUCN VNatural Area
0.01 km² overlap
Unknown
IUCN VPark
0.01 km² overlap
Unknown
IUCN VPark
0.00 km² overlap
Arnold Creek
IUCN VNatural Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 496 distinct species · 2 075 365 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Willamette River : 26 espèces reliées par 80 interactions GloBI sur 4 types (connectance 12.7%, filtre Serrano α=0.2). 10 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°
11,5°C
Annual rain
1 149mm
Moisture idx (CMI)
0,14
Runoff
1 174mm/an
PET
969mm
AET
630mm
Mean slope
3,8°
Water table
177cm
Forest
25%
Crops
6%
Urban
85%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)