HydroBASINS lev08 watershed · #7080406950
Bassin de South Yamhill 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 5 administrative regions : Lincoln, Polk, Tillamook, Washington, Yamhill
Sub-basin area
2 009,9km²
Upstream area
2 009,9km²
Discharge
87,86m³/s
Mean elev.
231m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- 1405.7 km²69.8% of basin
- Polk577.2 km²28.7% of basin
- 22.5 km²1.1% of basin
- Lincoln6.8 km²0.3% of basin
- Washington2.2 km²0.1% of basin
14 intersecting protected areas
Trappist Abbey
IUCN Not AssignedConservation Easement
5.35 km² overlap
Walker Creek, Oregon
IUCN VWild and Scenic River
4.00 km² overlap
Noble Oaks
IUCN VPrivate Conservation Land
2.69 km² overlap
Baskett Slough
IUCN IVNational Wildlife Refuge
2.60 km² overlap
Reserve Program
2.54 km² overlap
Yamhill Oaks
IUCN VPrivate Conservation Land
2.48 km² overlap
Reserve Program
2.01 km² overlap
Zena
IUCN Not AssignedConservation Easement
1.57 km² overlap
Mt. Richmond
IUCN Not AssignedConservation Easement
1.14 km² overlap
5 more protected areassorted by overlap area
Us-Or-206-1
IUCN Not AssignedConservation Easement
0.38 km² overlap
Rotary
IUCN VNature Preserve
0.13 km² overlap
Reserve Program
0.13 km² overlap
Erratic Rock
IUCN VState Natural Site
0.02 km² overlap
Heather Hollow
IUCN VLocal Conservation Area
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 426 distinct species · 255 708 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 South Yamhill River : 24 espèces reliées par 70 interactions GloBI sur 5 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°
10,0°C
Annual rain
1 754mm
Moisture idx (CMI)
0,38
Runoff
1 378mm/an
PET
971mm
AET
645mm
Mean slope
7,3°
Water table
245cm
Forest
54%
Crops
23%
Urban
2%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)