HydroBASINS lev08 watershed · #7080468810
Bassin de Souhegan 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 3 administrative regions : Hillsborough, Middlesex, Worcester
Sub-basin area
453,1km²
Upstream area
453,1km²
Discharge
8,73m³/s
Mean elev.
244m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- Hillsborough427.1 km²94.1% of basin
- Worcester14.7 km²3.2% of basin
- 12.0 km²2.6% of basin
30 intersecting protected areas
Wapack
IUCN IVNational Wildlife Refuge
4.35 km² overlap
Joanne Bass Bross
IUCN VPreserve
1.70 km² overlap
Temple Mountain State
IUCN VIReservation
1.08 km² overlap
Seven Maples Farm
IUCN Not AssignedConservation Easement
1.00 km² overlap
Sheldrick
IUCN VForest
0.95 km² overlap
Furnace Brook
IUCN Not AssignedConservation Easement
0.67 km² overlap
Wilkins #5
IUCN VConservation Easement
0.48 km² overlap
Barrett House
IUCN VPCL
0.45 km² overlap
Wilkins #2
IUCN VConservation Easement
0.40 km² overlap
21 more protected areassorted by overlap area
Tallarico
IUCN VConservation Easement
0.34 km² overlap
Dubois | Monadnock Conservancy
IUCN Not AssignedConservation Easement
0.32 km² overlap
Castle Trust South
IUCN Not AssignedConservation Easement
0.29 km² overlap
Connolly
IUCN VConservation Easement
0.29 km² overlap
Otter Brook Farm
IUCN Not AssignedConservation Easement
0.27 km² overlap
Watatic Mountain
IUCN VSanctuary
0.24 km² overlap
Castle Trust North
IUCN Not AssignedConservation Easement
0.24 km² overlap
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), Hillsborough, NH
IUCN VConservation Easement
0.17 km² overlap
Rotch
IUCN VWildlife Preserve
0.17 km² overlap
Ceasar's Brook
IUCN VReservation
0.17 km² overlap
Dudley
IUCN Not AssignedEasement
0.16 km² overlap
Salo Lot CR
IUCN Not AssignedConservation Easement
0.13 km² overlap
Bate Bequest
IUCN Not AssignedLocal Other or Unknown
0.12 km² overlap
Heald Tracts
IUCN VNatural Area
0.12 km² overlap
Dubois | Monadnock Conservancy
IUCN Not AssignedConservation Easement
0.11 km² overlap
Chris Weston
IUCN Not AssignedConservation Area
0.10 km² overlap
Binney Pond
IUCN VNatural Area
0.09 km² overlap
North of Davis
IUCN Not AssignedLocal Other or Unknown
0.09 km² overlap
Mitchell Drive
IUCN VConservation Area
0.08 km² overlap
Dubois | Monadnock Conservancy
IUCN Not AssignedConservation Easement
0.07 km² overlap
Worcester Land
IUCN VPrivate Conservation
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 099 distinct species · 226 261 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 Souhegan River : 23 espèces reliées par 99 interactions GloBI sur 4 types (connectance 14.9%, filtre Serrano α=0.2). 14 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°
7,4°C
Annual rain
1 134mm
Moisture idx (CMI)
0,17
Runoff
655mm/an
PET
940mm
AET
748mm
Mean slope
4,3°
Water table
418cm
Forest
98%
Crops
3%
Urban
5%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)