HydroBASINS lev08 watershed · #7080526780
Bassin de South Branch Raritan 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 4 administrative regions : Hunterdon, Mercer, Morris, Somerset
Sub-basin area
719,1km²
Upstream area
719,2km²
Discharge
14,97m³/s
Mean elev.
143m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 521.7 km²72.5% of basin
- Morris127.9 km²17.8% of basin
- Somerset70.4 km²9.8% of basin
- Mercer0.0 km²0.0% of basin
30 intersecting protected areas
Clinton
IUCN VWildlife Management Area
9.12 km² overlap
Round Valley
IUCN VReservoir
8.88 km² overlap
South Branch
IUCN VWildlife Management Area
6.27 km² overlap
Conservation Area
IUCN VConservation Area
6.10 km² overlap
Sourland Mountain
IUCN VPreserve
4.58 km² overlap
South Branch River
IUCN VReserve
3.87 km² overlap
Teetertown Ravine
IUCN VNature Preserve
2.40 km² overlap
Hagedorn
IUCN VPreserve
2.16 km² overlap
Ken Lockwood Gorge
IUCN VWildlife Management Area
1.96 km² overlap
21 more protected areassorted by overlap area
Round Mountain
IUCN VReserve
1.73 km² overlap
Budd Lake Bog
IUCN VPreserve
1.01 km² overlap
Njcf #023 / 642
IUCN Not AssignedConservation Easement
0.98 km² overlap
Preserve
IUCN VPreserve
0.84 km² overlap
South Branch
IUCN VPreserve
0.73 km² overlap
Northern Stony Brook
IUCN VGreenway
0.72 km² overlap
Drakestown
IUCN VPreserve
0.71 km² overlap
Jugtown Mountain
IUCN VReserve
0.52 km² overlap
Springside Woodlands
IUCN VConservation Area
0.48 km² overlap
Bunting
IUCN Not AssignedConservation Easement
0.48 km² overlap
Njcf #260 / 593
IUCN Not AssignedConservation Easement
0.47 km² overlap
Union Forge
IUCN VNature Preserve
0.38 km² overlap
Lake Solitude
IUCN VConservation Area
0.37 km² overlap
Njcf #446
IUCN Not AssignedConservation Easement
0.36 km² overlap
Cider Mill Grassland
IUCN VPreserve
0.36 km² overlap
Sourland Mountain
IUCN VGreenway
0.36 km² overlap
Echo Hill
IUCN VEnvironmental Center
0.35 km² overlap
Bush/Ennis
IUCN Not AssignedConservation Easement
0.35 km² overlap
Milligan Farm
IUCN VConservation Area
0.34 km² overlap
Hacketts
IUCN VPreserve
0.32 km² overlap
Budd Lake
IUCN VWildlife Management Area
0.30 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 995 distinct species · 1 353 044 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 South Branch Raritan River : 21 espèces reliées par 73 interactions GloBI sur 3 types (connectance 13.0%, 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°
10,1°C
Annual rain
1 214mm
Moisture idx (CMI)
0,13
Runoff
657mm/an
PET
1 053mm
AET
861mm
Mean slope
3,2°
Water table
230cm
Forest
92%
Crops
31%
Urban
12%
Protected
8%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)