HydroBASINS lev08 watershed · #7080495520
Bassin de North Walnet 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 4 administrative regions : Benton, Iowa, Poweshiek, Tama
Sub-basin area
508,4km²
Upstream area
6 600,9km²
Discharge
54,96m³/s
Mean elev.
265m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Iowa River929 km²
- Bassin de Salt Creek573 km²
4 dept-equivalent regions (GADM L2)
- PoweshiekIowa · United States218.2 km²42.9% of basin
- IowaIowa · United States152.6 km²30.0% of basin
- BentonIowa · United States98.3 km²19.3% of basin
- TamaIowa · United States40.2 km²7.9% of basin
16 intersecting protected areas
Iowa River Corridor
IUCN VWildlife Management Area
26.60 km² overlap
Port Louisa
IUCN IVNational Wildlife Refuge
25.97 km² overlap
Reserve Program
15.08 km² overlap
Reserve Program
5.94 km² overlap
Reserve Program
2.56 km² overlap
Iowa River Corridor
IUCN VWildlife Management Area
1.48 km² overlap
Watershed Protection
0.70 km² overlap
Reserve Program
0.68 km² overlap
Farm Service Agency Interest Of Ia
IUCN Not AssignedConservation Easement
0.52 km² overlap
7 more protected areassorted by overlap area
Reserve Program
0.33 km² overlap
Reserve Program
0.26 km² overlap
Barclay Timber
IUCN VLocal Conservation Area
0.23 km² overlap
Conservation Easement
0.15 km² overlap
Reserve Program
0.13 km² overlap
Watershed Protection
0.08 km² overlap
Gunderson
IUCN VWildlife Area
0.05 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
302 distinct species · 2 534 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 North Walnet Creek : 31 espèces reliées par 89 interactions GloBI sur 4 types (connectance 9.4%, filtre Serrano α=0.2). 13 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°
8,8°C
Annual rain
888mm
Moisture idx (CMI)
-0,13
Runoff
271mm/an
PET
1 017mm
AET
752mm
Mean slope
1,6°
Water table
106cm
Forest
6%
Crops
79%
Urban
0%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)