HydroBASINS lev08 watershed · #7080569650
Bassin de Cahokia Creek
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, Jersey, Macoupin, Madison, Montgomery +1
Sub-basin area
1 629,2km²
Upstream area
446 350,8km²
Discharge
3 594m³/s
Mean elev.
170m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Dardenne Creek541 km²
- Bassin de Illinois River530 km²
6 dept-equivalent regions (GADM L2)
- Madison731.7 km²44.9% of basin
- 483.3 km²29.6% of basin
- 260.1 km²16.0% of basin
- Saint Charles143.7 km²8.8% of basin
- Montgomery11.7 km²0.7% of basin
- Calhoun0.0 km²0.0% of basin
28 intersecting protected areas
Us-Mo-42-8
IUCN Not AssignedConservation Easement
4.75 km² overlap
Marais Temps Clair
IUCN VConservation Area
3.84 km² overlap
Piasa Island
IUCN VWildlife Management Area
3.69 km² overlap
Jones-Confluence Point
IUCN IIIState Park
2.97 km² overlap
Us-Mo-42-2
IUCN Not AssignedConservation Easement
2.70 km² overlap
State Park
2.63 km² overlap
Maple Island
IUCN VLocal Conservation Area
1.91 km² overlap
John M. Olin
IUCN VNature Preserve
1.20 km² overlap
State Conservation Area or Park
0.66 km² overlap
19 more protected areassorted by overlap area
Conservation Area
0.42 km² overlap
Ellis Island
IUCN VLocal Conservation Area
0.39 km² overlap
Wildlife Area
0.37 km² overlap
Gillespie Prairie
IUCN VState Natural Area
0.30 km² overlap
Watershed
IUCN VNature Center
0.23 km² overlap
Mississippi Sanctuary
IUCN VNature Preserve
0.18 km² overlap
Nature Preserve
0.18 km² overlap
Piasa Creek Wetland #2
IUCN VWetland
0.17 km² overlap
Distillery Hollow Glade
IUCN VConservation Area
0.15 km² overlap
Oblate
IUCN Not AssignedBuffer
0.11 km² overlap
Oblate Fathers' Woods
IUCN VNature Preserve
0.07 km² overlap
The Nursery
IUCN VNursery
0.06 km² overlap
E. Dora Bohm Memorial
IUCN VNature Preserve
0.05 km² overlap
Poag Railroad Prairie
IUCN VConservation Area
0.03 km² overlap
East Alton
IUCN VRecreation Center
0.02 km² overlap
Nature Preserve
0.02 km² overlap
Natural Area
0.02 km² overlap
Chouteau
IUCN VBotanical Area
0.00 km² overlap
State Conservation Area or Park
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 473 distinct species · 856 764 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Cahokia Creek : 25 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 69 interactions GloBI sur 3 types (connectance 13.9%, filtre Serrano α=0.2). 7 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°
12,3°C
Annual rain
966mm
Moisture idx (CMI)
-0,14
Runoff
238mm/an
PET
1 120mm
AET
814mm
Mean slope
0,9°
Water table
64cm
Forest
14%
Crops
55%
Urban
8%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)