HydroBASINS lev08 watershed · #7080468640
Bassin de Merrimack 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, Merrimack, Rockingham
Sub-basin area
407,6km²
Upstream area
8 405,8km²
Discharge
175,16m³/s
Mean elev.
115m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Piscataquog River548 km²
- Bassin de Merrimack River184 km²
3 dept-equivalent regions (GADM L2)
- Hillsborough222.1 km²54.4% of basin
- 168.9 km²41.4% of basin
- 17.3 km²4.2% of basin
22 intersecting protected areas
Mitigation
1.34 km² overlap
Joe English
IUCN VConservation Land
1.03 km² overlap
Pulpit Rock
IUCN VConservation Area
0.71 km² overlap
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), Rockingham, NH
IUCN Not AssignedConservation Easement
0.53 km² overlap
Reserve Program
0.50 km² overlap
Burchell
IUCN VLocal Conservation Area
0.36 km² overlap
Van Loan
IUCN VPreserve
0.27 km² overlap
Huckabee Land
IUCN VConservation Easement
0.17 km² overlap
Borgsewicz
IUCN VEasement
0.12 km² overlap
13 more protected areassorted by overlap area
Benedictine
IUCN VPark
0.11 km² overlap
Odell
IUCN Not AssignedLocal Other or Unknown
0.08 km² overlap
Hockman
IUCN VConservation Land
0.04 km² overlap
Pointer Brook
IUCN VConservation Easement
0.03 km² overlap
Large White Lot
IUCN VLocal Conservation Area
0.03 km² overlap
Bedford
IUCN VWildlife Sanctuary
0.03 km² overlap
Eagle
IUCN IIIPark
0.03 km² overlap
Wildlife
IUCN VSanctuary
0.03 km² overlap
Sales Parcel
IUCN VLocal Conservation Area
0.03 km² overlap
George Parcel
IUCN VLocal Conservation Area
0.03 km² overlap
Private Conservation
0.01 km² overlap
Bedford 04-2306
IUCN VConservation Easement
0.00 km² overlap
Mitchell Drive
IUCN VConservation Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 806 distinct species · 96 307 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 45 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 Merrimack River : 30 espèces reliées par 112 interactions GloBI sur 4 types (connectance 11.3%, filtre Serrano α=0.2). 15 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°
7,9°C
Annual rain
1 070mm
Moisture idx (CMI)
0,10
Runoff
698mm/an
PET
968mm
AET
743mm
Mean slope
2,7°
Water table
318cm
Forest
90%
Crops
2%
Urban
23%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)