HydroBASINS lev08 watershed · #7080420200
Bassin de Willow 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 : Barron, Pierce, Polk, Ramsey, Saint Croix +1
Sub-basin area
1 954,5km²
Upstream area
19 958,1km²
Discharge
156,81m³/s
Mean elev.
303m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Apple River1518 km²
- Bassin de Saint Croix River597 km²
6 dept-equivalent regions (GADM L2)
- 1169.5 km²59.7% of basin
- Washington537.0 km²27.4% of basin
- Pierce153.7 km²7.8% of basin
- Polk96.5 km²4.9% of basin
- 1.4 km²0.1% of basin
- 0.8 km²0.0% of basin
30 intersecting protected areas
Willow River
IUCN VWildlife Area
14.80 km² overlap
Cylon
IUCN VWildlife Area
9.47 km² overlap
Kinnickinnic
IUCN Not AssignedState Park
5.46 km² overlap
Lower Saint Croix
IUCN VNational Scenic Riverway
3.83 km² overlap
Stream Bank Protection Fee Program
IUCN Not AssignedConservation Area
3.45 km² overlap
Statewide
IUCN VWildlife Habitat
2.63 km² overlap
Belwin Conservancy
IUCN VLocal Conservation Area
2.43 km² overlap
Nature Preserve
2.23 km² overlap
Cylon Marsh
IUCN VWildlife Area
2.02 km² overlap
21 more protected areassorted by overlap area
Western Prairie Habitat Restorat
IUCN Not AssignedConservation Easement
1.85 km² overlap
Bayport
IUCN VState Wildlife Management Area
1.83 km² overlap
Natural Area
1.30 km² overlap
St Croix Islands
IUCN VWildlife Area
1.03 km² overlap
Scattered Wildlife
IUCN VWildlife Area
0.94 km² overlap
Natural Area
0.60 km² overlap
Highland
IUCN VPark
0.25 km² overlap
Farm Service Agency Interest Of Wi
IUCN Not AssignedConservation Easement
0.24 km² overlap
Local Conservation Area
0.15 km² overlap
Reserve Program
0.09 km² overlap
Aquatic Management Area
0.09 km² overlap
Jackson
IUCN VWildlife Management Area
0.07 km² overlap
Reserve Program
0.07 km² overlap
Foster Conservancy Area
IUCN VLocal Conservation Area
0.05 km² overlap
Leroy
IUCN VPark
0.05 km² overlap
Lower St. Croix
IUCN VNational Scenic Riverway
0.03 km² overlap
Unknown
IUCN VPark
0.03 km² overlap
Boulder Ridge
IUCN VPark
0.03 km² overlap
Statewide Habitat Areas
IUCN VHabitat Area
0.03 km² overlap
Croixwood
IUCN VOpen Space
0.02 km² overlap
Scenic
IUCN Not AssignedEasement
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 925 distinct species · 927 431 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 Willow River : 34 espèces reliées par 77 interactions GloBI sur 4 types (connectance 9.4%, filtre Serrano α=0.2). 7 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°
6,6°C
Annual rain
788mm
Moisture idx (CMI)
-0,14
Runoff
239mm/an
PET
917mm
AET
667mm
Mean slope
1,7°
Water table
102cm
Forest
14%
Crops
40%
Urban
6%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)