HydroBASINS lev08 watershed · #7080472690
Bassin de Niobrara 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 3 administrative regions : Boyd, Holt, Knox
Sub-basin area
2 375,4km²
Upstream area
32 383,2km²
Discharge
36,43m³/s
Mean elev.
559m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Keya Paha River1238 km²
- Bassin de Niobrara River1016 km²
3 dept-equivalent regions (GADM L2)
- Holt1968.1 km²82.7% of basin
- Knox261.6 km²11.0% of basin
- Boyd149.7 km²6.3% of basin
9 intersecting protected areas
Reserve Program
11.43 km² overlap
Reserve Program
3.61 km² overlap
Bohemia Prairie
IUCN VWildlife Management Area
2.75 km² overlap
Redbird
IUCN VWildlife Management Area
1.75 km² overlap
Reserve Program
1.15 km² overlap
Parshall Bridge
IUCN VWildlife Management Area
0.87 km² overlap
O. John Emerson
IUCN VWildlife Management Area
0.65 km² overlap
Spencer Dam
IUCN VWildlife Management Area
0.03 km² overlap
Hull Lake
IUCN VWildlife Management Area
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
702 distinct species · 8 133 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 Niobrara River : 29 espèces reliées par 109 interactions GloBI sur 4 types (connectance 14.7%, filtre Serrano α=0.2). 10 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°
8,9°C
Annual rain
586mm
Moisture idx (CMI)
-0,45
Runoff
106mm/an
PET
1 075mm
AET
502mm
Mean slope
1,3°
Water table
175cm
Forest
2%
Crops
42%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)