HydroBASINS lev08 watershed · #7080707760
Bassin de Ouachita 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 4 administrative regions : Ashley, Morehouse, Union
Sub-basin area
1 158,1km²
Upstream area
29 182,8km²
Discharge
440,04m³/s
Mean elev.
38m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Ouachita River478 km²
- Bassin de Ouachita River199 km²
4 dept-equivalent regions (GADM L2)
- Union451.2 km²39.0% of basin
- 303.1 km²26.2% of basin
- AshleyArkansas · United States241.7 km²20.9% of basin
- UnionArkansas · United States161.5 km²14.0% of basin
10 intersecting protected areas
Upper Ouachita
IUCN IVNational Wildlife Refuge
220.80 km² overlap
Felsenthal
IUCN IVNational Wildlife Refuge
49.78 km² overlap
Reserve Program
29.68 km² overlap
State Wildlife Management Area
28.85 km² overlap
Private Conservation Land
7.53 km² overlap
Ouachita River
IUCN VState Wild or Scenic River
4.22 km² overlap
R. R. Reynolds
IUCN IaResearch Natural Area
0.33 km² overlap
Reserve Program
0.26 km² overlap
Coffee Prairie
IUCN VNatural Area
0.25 km² overlap
1 more protected areassorted by overlap area
Upper Ouachita
IUCN VNational Wildlife Refuge
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 237 distinct species · 25 715 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 Ouachita River : 25 espèces reliées par 80 interactions GloBI sur 4 types (connectance 13.4%, 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°
17,3°C
Annual rain
1 367mm
Moisture idx (CMI)
-0,03
Runoff
543mm/an
PET
1 407mm
AET
1 043mm
Mean slope
0,7°
Water table
32cm
Forest
90%
Crops
6%
Urban
0%
Protected
23%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)