HydroBASINS lev08 watershed · #7080566040

Bassin de Illinois 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 4 administrative regions : Calhoun, Greene, Jersey, Saint Charles

31% lakePfafstetter: 74282110

Sub-basin area

530,1km²

Upstream area

73 123,1km²

Discharge

838,59m³/s

Mean elev.

174m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Cahokia Creek1629 km²

▲ Receives from 2 basins

Bassin de Macoupin Creek2444 km²
Bassin de Illinois River294 km²

4 dept-equivalent regions (GADM L2)

Jersey
Illinois · United States
360.4 km²
67.9% of basin
Calhoun
Illinois · United States
156.6 km²
29.5% of basin
Greene
Illinois · United States
13.4 km²
2.5% of basin
Saint Charles
Missouri · United States
0.1 km²
0.0% of basin

18 intersecting protected areas

12 Mile Island Wildlife Management Area - Glades
IUCN V
Wildlife Management Area
5.74 km² overlap
Two Rivers
IUCN V
National Wildlife Refuge
2.65 km² overlap
Mississippi River State Forest Wildlife Area - Mortland
IUCN V
Wildlife Area
2.13 km² overlap
Pere Marquette Bluffs
IUCN V
Conservation Area
1.19 km² overlap
Mcadams Peak
IUCN V
Land And Water Reserve
0.95 km² overlap
Mcadams Peak Hill Prairie
IUCN V
Conservation Area
0.94 km² overlap
Kamp's Glade
IUCN V
Natural Area
0.87 km² overlap
Emergency Watershed Protection Program - Floodplain Easement (EWPP-FPE), Jersey, IL
IUCN V
Watershed Protection
0.77 km² overlap
Katelyn's Woods
IUCN V
Land And Water Reserve
0.55 km² overlap

9 more protected areassorted by overlap area

Golden Eagle
IUCN V
Wildlife Preserve
0.53 km² overlap
Us-Il-132-1
IUCN Not Assigned
Conservation Easement
0.52 km² overlap
Mortland Glade
IUCN V
Conservation Area
0.42 km² overlap
Krause Woods
IUCN V
Natural Area
0.33 km² overlap
Wetlands Reserve Program (WRP), Greene, IL
IUCN V
Reserve Program
0.29 km² overlap
Two Rivers
IUCN V
National Wildlife Refuge
0.12 km² overlap
Lead Hollow Glade
IUCN V
Natural Area
0.09 km² overlap
Brainerd Cave
IUCN V
Land And Water Reserve
0.04 km² overlap
Two Rivers
IUCN V
National Wildlife Refuge
0.01 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

1 872 distinct species · 51 884 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 33 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de Illinois River : 25 espèces reliées par 71 interactions GloBI sur 3 types (connectance 12.7%, filtre Serrano α=0.2). 9 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.127

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

12,1°C

Annual rain

957mm

Moisture idx (CMI)

-0,16

Runoff

225mm/an

PET

1 142mm

AET

808mm

Mean slope

2,6°

Water table

183cm

Forest

39%

Crops

45%

Urban

Protected

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)