HydroBASINS lev08 watershed · #7080556110
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 6 administrative regions : Calhoun, Greene, Morgan, Pike, Sangamon +1
Sub-basin area
1 710,1km²
Upstream area
68 744,9km²
Discharge
803,13m³/s
Mean elev.
179m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Siloam Creek1169 km²
- Bassin de Illinois River1142 km²
6 dept-equivalent regions (GADM L2)
- 608.3 km²35.5% of basin
- Morgan584.5 km²34.1% of basin
- Pike336.3 km²19.6% of basin
- Greene173.3 km²10.1% of basin
- Calhoun6.5 km²0.4% of basin
- 3.0 km²0.2% of basin
7 intersecting protected areas
Wildlife Area
5.66 km² overlap
Reserve Program
0.69 km² overlap
Reserve Program
0.19 km² overlap
Reserve Program
0.18 km² overlap
Reserve Program
0.04 km² overlap
Conservation Area
0.03 km² overlap
Twin Culvert Cave Fee
IUCN VPrivate Conservation Land
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 207 distinct species · 51 959 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 Illinois River : 29 espèces reliées par 69 interactions GloBI sur 3 types (connectance 11.0%, 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°
11,4°C
Annual rain
937mm
Moisture idx (CMI)
-0,15
Runoff
263mm/an
PET
1 104mm
AET
792mm
Mean slope
0,9°
Water table
75cm
Forest
10%
Crops
61%
Urban
1%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)