HydroBASINS lev08 watershed · #7080694340
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 6 administrative regions : Calhoun, Clark, Dallas, Hot Spring, Nevada +1
Sub-basin area
2 517km²
Upstream area
15 081km²
Discharge
234,21m³/s
Mean elev.
69m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
6 dept-equivalent regions (GADM L2)
- OuachitaArkansas · United States1262.5 km²50.2% of basin
- DallasArkansas · United States684.0 km²27.2% of basin
- CalhounArkansas · United States566.4 km²22.5% of basin
- NevadaArkansas · United States2.3 km²0.1% of basin
- Hot SpringArkansas · United States0.8 km²0.0% of basin
- ClarkArkansas · United States0.1 km²0.0% of basin
5 intersecting protected areas
Wildlife Management Area
14.16 km² overlap
Poison Springs Fee
IUCN VPrivate Conservation Land
2.61 km² overlap
Reserve Program
1.21 km² overlap
Arkansas Heritage
IUCN VNatural Area
0.21 km² overlap
Forest Preserve
0.21 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 386 distinct species · 9 791 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 : 32 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 95 interactions GloBI sur 4 types (connectance 10.0%, filtre Serrano α=0.2). 12 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°
16,6°C
Annual rain
1 321mm
Moisture idx (CMI)
-0,05
Runoff
467mm/an
PET
1 388mm
AET
1 036mm
Mean slope
1,1°
Water table
48cm
Forest
99%
Crops
2%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)