HydroBASINS lev08 watershed · #7080461550
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 1 administrative regions : Merrimack
Sub-basin area
223,2km²
Upstream area
6 331,4km²
Discharge
138,82m³/s
Mean elev.
140m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Contoocook River1982 km²
- Bassin de Merrimack River175 km²
1 dept-equivalent regions (GADM L2)
- 223.6 km²100.0% of basin
16 intersecting protected areas
Samuel Myron Chase
IUCN VWildlife Sanctuary
1.74 km² overlap
Local Conservation Area
1.29 km² overlap
Stone Farm
IUCN Not AssignedConservation Easement
0.66 km² overlap
Carter Tract
IUCN VConservation Easement
0.48 km² overlap
Island Reserve
0.19 km² overlap
Emmons
IUCN VPCL
0.18 km² overlap
Thunberg
IUCN VConservation Easement
0.09 km² overlap
Fox Meadow Drive
IUCN VOpen Space
0.06 km² overlap
Delta Dental
IUCN Not AssignedConservation Easement
0.04 km² overlap
7 more protected areassorted by overlap area
Govenor's Woods
IUCN VConservation Easement
0.03 km² overlap
Brookwood
IUCN VOpen Space
0.03 km² overlap
Claremont And Concord Railroad Bed
IUCN Not AssignedConservation Easement
0.03 km² overlap
Verres Financial Corp.
IUCN VConservation Easement
0.02 km² overlap
Booth Property
IUCN VLocal Conservation Area
0.01 km² overlap
Concord 99-1073
IUCN VConservation Easement
0.01 km² overlap
Whittier Drive
IUCN VOpen Space
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 792 distinct species · 388 132 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 : 25 espèces reliées par 96 interactions GloBI sur 4 types (connectance 14.4%, 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°
7,3°C
Annual rain
1 035mm
Moisture idx (CMI)
0,06
Runoff
677mm/an
PET
968mm
AET
731mm
Mean slope
3,2°
Water table
236cm
Forest
85%
Crops
2%
Urban
16%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)