HydroBASINS lev08 watershed · #7080546460
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 8 administrative regions : Brown, Cass, Menard, Morgan, Pike +3
Sub-basin area
1 141,7km²
Upstream area
65 865,8km²
Discharge
762,17m³/s
Mean elev.
170m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Moine River396 km²
- Bassin de Illinois River80 km²
8 dept-equivalent regions (GADM L2)
- Morgan514.7 km²45.0% of basin
- 434.7 km²38.0% of basin
- 132.9 km²11.6% of basin
- 31.6 km²2.8% of basin
- Pike22.8 km²2.0% of basin
- 5.9 km²0.5% of basin
- 0.3 km²0.0% of basin
- 0.0 km²0.0% of basin
11 intersecting protected areas
Meredosia
IUCN IVNational Wildlife Refuge
14.97 km² overlap
Meredosia Refuge Fee
IUCN VRefuge
4.75 km² overlap
Reserve Program
4.30 km² overlap
Wildlife Area
3.49 km² overlap
Wildlife Area
1.35 km² overlap
Reserve Program
1.31 km² overlap
Shick Shack Sand Pond
IUCN VState Natural Area
0.24 km² overlap
Meredosia Hill Prairie
IUCN VState Natural Area
0.14 km² overlap
Land And Water Reserve
0.08 km² overlap
2 more protected areassorted by overlap area
Wilson Island Bed
IUCN VConservation Area
0.01 km² overlap
Land And Water Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 569 distinct species · 65 151 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 Illinois River : 30 espèces reliées par 69 interactions GloBI sur 3 types (connectance 10.4%, 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°
11,2°C
Annual rain
948mm
Moisture idx (CMI)
-0,14
Runoff
281mm/an
PET
1 097mm
AET
801mm
Mean slope
0,7°
Water table
58cm
Forest
11%
Crops
68%
Urban
0%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)