HydroBASINS lev08 watershed · #7080518320
Bassin de Big Blue 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 : Butler, Hamilton, Polk, Seward, York
Sub-basin area
1 654,7km²
Upstream area
1 654,7km²
Discharge
7,99m³/s
Mean elev.
504m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- Polk632.0 km²38.1% of basin
- Butler611.5 km²36.9% of basin
- Hamilton241.4 km²14.6% of basin
- Seward99.7 km²6.0% of basin
- York72.3 km²4.4% of basin
11 intersecting protected areas
Reserve Program
0.88 km² overlap
Reserve Program
0.69 km² overlap
Reserve Program
0.50 km² overlap
Renquist Basin
IUCN VWildlife Management Area
0.43 km² overlap
Mae Carey Estate Working Landscape Easement 2
IUCN Not AssignedEasement
0.36 km² overlap
Revolving Property
IUCN VPrivate Conservation
0.33 km² overlap
Flatsedge
IUCN VWildlife Management Area
0.32 km² overlap
Reserve Program
0.31 km² overlap
Hamilton County
IUCN VWaterfowl Production Area
0.23 km² overlap
2 more protected areassorted by overlap area
Polk County
IUCN VWaterfowl Production Area
0.20 km² overlap
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), Hamilton, NE
IUCN VConservation Easement
0.16 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
454 distinct species · 10 032 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Blue River : 34 espèces reliées par 75 interactions GloBI sur 4 types (connectance 10.1%, filtre Serrano α=0.2). 5 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°
10,2°C
Annual rain
710mm
Moisture idx (CMI)
-0,35
Runoff
151mm/an
PET
1 092mm
AET
605mm
Mean slope
0,4°
Water table
75cm
Forest
8%
Crops
86%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)