HydroBASINS lev08 watershed · #7080046750
Bassin de Old Fort Bayou
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 2 administrative regions : Harrison, Jackson
Sub-basin area
194,1km²
Upstream area
194,1km²
Discharge
1,39m³/s
Mean elev.
10m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- Jackson167.9 km²86.6% of basin
- Harrison14.3 km²7.4% of basin
20 intersecting protected areas
Marine Protected Area
29.00 km² overlap
Mississippi Sandhill Crane
IUCN IVNational Wildlife Refuge
28.91 km² overlap
Davis Bayou Coastal Preserve
IUCN IVMarine Protected Area
7.89 km² overlap
Private Conservation Land
7.35 km² overlap
Marine Protected Area
5.26 km² overlap
Old Fort Bayou
IUCN VCoastal Reserve
4.59 km² overlap
Bellefontaine Point
IUCN VCoastal Reserve
4.46 km² overlap
Marine Protected Area
4.27 km² overlap
Marine Protected Area
3.77 km² overlap
11 more protected areassorted by overlap area
Davis Bayou
IUCN VCoastal Reserve
3.01 km² overlap
Gulf Islands
IUCN VNational Seashore
1.54 km² overlap
Old Fort Bayou Fee
IUCN VPrivate Conservation Land
0.41 km² overlap
Graveline Bay
IUCN VCoastal Reserve
0.10 km² overlap
Marine Protected Area
0.10 km² overlap
Easement
0.08 km² overlap
Old Fort Bayou
IUCN VEasement
0.05 km² overlap
Marine Protected Area
0.02 km² overlap
Mitigation Bank
0.01 km² overlap
Gulf Islands
IUCN VINational Seashore
0.01 km² overlap
Biloxi River
IUCN VCoastal Reserve
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 292 distinct species · 76 572 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 Old Fort Bayou : 28 espèces reliées par 88 interactions GloBI sur 4 types (connectance 10.2%, 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°
19,6°C
Annual rain
1 609mm
Moisture idx (CMI)
0,18
Runoff
759mm/an
PET
1 319mm
AET
1 194mm
Mean slope
0,5°
Water table
14cm
Forest
84%
Crops
2%
Urban
29%
Protected
27%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)