HydroBASINS lev08 watershed · #7080503380
Bassin de Quassaic 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 3 administrative regions : Dutchess, Orange, Ulster
Sub-basin area
155km²
Upstream area
31 809,2km²
Discharge
689,17m³/s
Mean elev.
115m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Wappinger Creek539 km²
- Bassin de Hudson River486 km²
3 dept-equivalent regions (GADM L2)
- OrangeNew York · United States90.6 km²58.4% of basin
- UlsterNew York · United States35.4 km²22.8% of basin
- DutchessNew York · United States29.2 km²18.8% of basin
4 intersecting protected areas
Baxtertown Woods
IUCN VWildlife Management Area
1.85 km² overlap
Ulster
IUCN VForest Preserve
0.41 km² overlap
New York
IUCN VState Lands
0.08 km² overlap
Balmville Tree
IUCN VIUnique Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 288 distinct species · 169 051 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Quassaic Creek : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 78 interactions GloBI sur 3 types (connectance 13.1%, filtre Serrano α=0.2). 12 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°
9,7°C
Annual rain
1 109mm
Moisture idx (CMI)
0,09
Runoff
764mm/an
PET
1 014mm
AET
800mm
Mean slope
3,1°
Water table
238cm
Forest
76%
Crops
5%
Urban
38%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)