HydroBASINS lev08 watershed · #7080403230
Bassin de Tualatin 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 6 administrative regions : Clackamas, Columbia, Multnomah, Tillamook, Washington +1
Sub-basin area
1 948,7km²
Upstream area
26 098,1km²
Discharge
983,98m³/s
Mean elev.
193m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Pudding River2204 km²
- Bassin de Willamette River280 km²
6 dept-equivalent regions (GADM L2)
- Washington1635.5 km²83.7% of basin
- 179.3 km²9.2% of basin
- 65.6 km²3.4% of basin
- 60.6 km²3.1% of basin
- Columbia9.7 km²0.5% of basin
- 2.5 km²0.1% of basin
30 intersecting protected areas
Chehalem Ridge
IUCN VNatural Area
5.43 km² overlap
Tualatin River
IUCN IVNational Wildlife Refuge
5.36 km² overlap
Wapato Lake
IUCN IVNational Wildlife Refuge
3.73 km² overlap
Killin
IUCN VWetlands
2.39 km² overlap
Reserve Program
1.72 km² overlap
Penstemon Prairie
IUCN VNatural Area
1.15 km² overlap
Fern Hill
IUCN VForest
1.06 km² overlap
Spring Hill Wetlands
IUCN VNatural Area
0.98 km² overlap
Gotter Prairie
IUCN VNatural Area
0.93 km² overlap
21 more protected areassorted by overlap area
Atfalati Prairie
IUCN VEnvironmental System
0.82 km² overlap
State of Oregon
IUCN VLocal Conservation Area
0.80 km² overlap
Weber Farm
IUCN VNatural Area
0.76 km² overlap
North Abbey Creek
IUCN VNatural Area
0.63 km² overlap
Heritage Pine
IUCN VNatural Area
0.60 km² overlap
North Canemah Bluffs
IUCN VNatural Area
0.54 km² overlap
Camas Cliffs
IUCN VNatural Area
0.47 km² overlap
Baker Creek Canyon
IUCN VNatural Area
0.45 km² overlap
Willamette Narrows
IUCN VForest
0.42 km² overlap
North Carpenter Creek
IUCN VNatural Area
0.38 km² overlap
River's Bend Prairie
IUCN VNatural Area
0.37 km² overlap
Dairy McKay Confluence
IUCN VNatural Area
0.36 km² overlap
Peach Cove Fen
IUCN VNatural Area
0.36 km² overlap
Rainbow Farms
IUCN VEnvironmental System
0.31 km² overlap
Nike Woods
IUCN VNatural Area
0.30 km² overlap
Wilson Creek
IUCN VNatural Area
0.26 km² overlap
Minter Bridge
IUCN VNatural Area
0.24 km² overlap
Baker Heaton Confluence
IUCN VNatural Area
0.21 km² overlap
South Carpenter Creek
IUCN VNatural Area
0.21 km² overlap
Maroon Ponds
IUCN VPond
0.19 km² overlap
Bronson Creek
IUCN VGreenway
0.19 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 683 distinct species · 2 948 891 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Tualatin River : 23 espèces reliées par 66 interactions GloBI sur 4 types (connectance 11.8%, filtre Serrano α=0.2). 11 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 402mm
Moisture idx (CMI)
0,26
Runoff
1 202mm/an
PET
953mm
AET
625mm
Mean slope
5,8°
Water table
205cm
Forest
50%
Crops
22%
Urban
20%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)