HydroBASINS lev08 watershed · #7080478320
Bassin de Big Sioux 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 7 administrative regions : Clay, Dakota, Lincoln, Plymouth, Sioux +2
Sub-basin area
2 352,1km²
Upstream area
21 121,2km²
Discharge
60,06m³/s
Mean elev.
398m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Big Sioux River1177 km²
- Bassin de Rock River426 km²
7 dept-equivalent regions (GADM L2)
- Union948.0 km²40.2% of basin
- PlymouthIowa · United States581.5 km²24.7% of basin
- SiouxIowa · United States529.0 km²22.5% of basin
- Lincoln272.3 km²11.6% of basin
- WoodburyIowa · United States14.5 km²0.6% of basin
- Clay10.9 km²0.5% of basin
- Dakota0.0 km²0.0% of basin
30 intersecting protected areas
Private Conservation Land
12.90 km² overlap
Reserve Program
6.44 km² overlap
Reserve Program
5.59 km² overlap
Reserve Program
4.30 km² overlap
Deer Creek
IUCN VWildlife Management Area
4.17 km² overlap
Five Ridge Prairie
IUCN VState Preserve
3.34 km² overlap
Reserve Program
2.32 km² overlap
Union Grove
IUCN VGrove
2.01 km² overlap
Watershed Protection
1.69 km² overlap
21 more protected areassorted by overlap area
Pattee Creek
IUCN VState Wildlife Management Area
1.51 km² overlap
Broken Kettle Grasslands
IUCN VEasement
1.32 km² overlap
EC Lippke
IUCN VWetland
1.26 km² overlap
Petry Harmelink
IUCN VState Wildlife Management Area
1.24 km² overlap
Big Sioux
IUCN VRecreation Area
1.11 km² overlap
Watershed Protection
0.93 km² overlap
Newton Hills
IUCN VState Recreation Area
0.89 km² overlap
Reserve Program
0.88 km² overlap
Ryan
IUCN VState Wildlife Management Area
0.65 km² overlap
Doorenbos-Ford Tract
IUCN VLocal Conservation Area
0.64 km² overlap
Riverside Bluffs Prairie
IUCN VLocal Conservation Area
0.54 km² overlap
Reserve Program
0.50 km² overlap
Boyd's Bend
IUCN VLocal Conservation Area
0.45 km² overlap
Tracy Tracts
IUCN VLocal Conservation Area
0.43 km² overlap
Loess Hills
IUCN VEasement
0.38 km² overlap
Mount Talbot
IUCN VState Preserve
0.38 km² overlap
Cut Off Bend
IUCN VState Wildlife Management Area
0.35 km² overlap
Watershed Protection
0.34 km² overlap
Willow Run
IUCN VState Wildlife Management Area
0.34 km² overlap
Watershed
IUCN VLake
0.32 km² overlap
Petry-conway
IUCN VState Wildlife Management Area
0.30 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 618 distinct species · 59 599 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 Big Sioux River : 22 espèces reliées par 78 interactions GloBI sur 3 types (connectance 14.8%, 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°
8,4°C
Annual rain
667mm
Moisture idx (CMI)
-0,35
Runoff
142mm/an
PET
1 032mm
AET
569mm
Mean slope
1,5°
Water table
154cm
Forest
8%
Crops
81%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)