HydroBASINS lev08 watershed · #7080750790
Bassin de Atchafalaya 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 : Avoyelles, Pointe Coupee, Rapides, Saint Landry, Saint Martin
Sub-basin area
1 611,4km²
Upstream area
1 611,4km²
Discharge
36,12m³/s
Mean elev.
18m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- 783.6 km²48.7% of basin
- 365.2 km²22.7% of basin
- 271.6 km²16.9% of basin
- 181.5 km²11.3% of basin
- 8.0 km²0.5% of basin
11 intersecting protected areas
Grand Cote
IUCN IVNational Wildlife Refuge
23.89 km² overlap
Reserve Program
18.68 km² overlap
Reserve Program
10.40 km² overlap
Reserve Program
4.79 km² overlap
Us-La-108-12
IUCN Not AssignedConservation Easement
3.48 km² overlap
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), Avoyelles, LA
IUCN VConservation Easement
2.20 km² overlap
Us-La-108-3
IUCN Not AssignedConservation Easement
1.30 km² overlap
National Wildlife Refuge
1.10 km² overlap
Watershed Protection
0.68 km² overlap
2 more protected areassorted by overlap area
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), St. Landry, LA
IUCN VConservation Easement
0.29 km² overlap
Conservation Easement
0.13 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
852 distinct species · 20 587 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Atchafalaya River : 25 espèces reliées par 83 interactions GloBI sur 4 types (connectance 13.2%, filtre Serrano α=0.2). 11 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°
19,1°C
Annual rain
1 519mm
Moisture idx (CMI)
0,06
Runoff
712mm/an
PET
1 432mm
AET
1 149mm
Mean slope
0,4°
Water table
17cm
Forest
24%
Crops
45%
Urban
1%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)