HydroBASINS lev08 watershed · #7080696200
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 : Calhoun, Dallas, Ouachita, Union
Sub-basin area
797,7km²
Upstream area
17 294,6km²
Discharge
265,46m³/s
Mean elev.
59m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Ouachita River2517 km²
- Bassin de Smackover Creek1416 km²
4 dept-equivalent regions (GADM L2)
- CalhounArkansas · United States586.0 km²73.5% of basin
- UnionArkansas · United States203.6 km²25.5% of basin
- DallasArkansas · United States6.6 km²0.8% of basin
- OuachitaArkansas · United States1.1 km²0.1% of basin
1 intersecting protected areas
Moro Big Pine Natural Area-Wildlife Man
IUCN Not AssignedNatural Area
39.20 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
886 distinct species · 8 070 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 Ouachita River : 28 espèces reliées par 103 interactions GloBI sur 4 types (connectance 12.0%, filtre Serrano α=0.2). 14 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°
16,7°C
Annual rain
1 324mm
Moisture idx (CMI)
-0,05
Runoff
474mm/an
PET
1 393mm
AET
1 033mm
Mean slope
0,9°
Water table
39cm
Forest
99%
Crops
2%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)