HydroBASINS lev08 watershed · #7080538390
Bassin de Thompson 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 : Daviess, Decatur, Grundy, Harrison, Mercer +1
Sub-basin area
1 516,8km²
Upstream area
3 025,2km²
Discharge
22,39m³/s
Mean elev.
291m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Grand River1193 km²
- Bassin de Long Creek316 km²
6 dept-equivalent regions (GADM L2)
- Harrison657.1 km²43.3% of basin
- DecaturIowa · United States351.8 km²23.2% of basin
- Mercer211.6 km²13.9% of basin
- Grundy183.0 km²12.1% of basin
- Daviess62.5 km²4.1% of basin
- RinggoldIowa · United States52.6 km²3.5% of basin
11 intersecting protected areas
State Wildlife Management Area
10.28 km² overlap
Crowder
IUCN IIIState Park
7.88 km² overlap
Sand Creek
IUCN VWildlife Management Area
0.84 km² overlap
Reserve Program
0.78 km² overlap
Reserve Program
0.22 km² overlap
Elk Creek
IUCN VWildlife Area
0.21 km² overlap
Wirth Springer Woods
IUCN VLocal Conservation Area
0.13 km² overlap
National Wildlife Refuge
0.13 km² overlap
Helton Prairie
IUCN VNatural Area
0.12 km² overlap
2 more protected areassorted by overlap area
Lake Paho
IUCN VConservation Area
0.06 km² overlap
Farm Service Agency Interest Of Ia
IUCN Not AssignedConservation Easement
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
886 distinct species · 18 504 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Thompson River : 30 espèces reliées par 88 interactions GloBI sur 4 types (connectance 11.3%, filtre Serrano α=0.2). 10 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°
10,4°C
Annual rain
906mm
Moisture idx (CMI)
-0,16
Runoff
238mm/an
PET
1 081mm
AET
767mm
Mean slope
1,6°
Water table
121cm
Forest
5%
Crops
52%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)