HydroBASINS lev08 watershed · #7080755220
Bassin de Bayou Saint John
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 : Jefferson, Orleans, Saint Charles, Saint John the Baptist, Saint Tammany
Sub-basin area
1 203,6km²
Upstream area
1 203,6km²
Discharge
25,49m³/s
Mean elev.
1m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- 437.2 km²36.4% of basin
- Jefferson331.0 km²27.5% of basin
- 201.6 km²16.8% of basin
- 174.5 km²14.5% of basin
- 58.0 km²4.8% of basin
6 intersecting protected areas
Marine Protected Area
44.83 km² overlap
Bayou Sauvage
IUCN IVNational Wildlife Refuge
44.82 km² overlap
Bayou Saint John
IUCN VState Wild or Scenic River
0.43 km² overlap
Bayou Labranche
IUCN VState Wild or Scenic River
0.11 km² overlap
Marine Protected Area
0.04 km² overlap
Bayou Trepagnier
IUCN VState Wild or Scenic River
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 201 distinct species · 677 427 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Bayou Saint John : 26 espèces reliées par 73 interactions GloBI sur 2 types (connectance 11.0%, 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°
20,0°C
Annual rain
1 533mm
Moisture idx (CMI)
0,09
Runoff
679mm/an
PET
1 396mm
AET
1 190mm
Mean slope
0,0°
Water table
2cm
Forest
7%
Crops
1%
Urban
9%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)