HydroBASINS lev08 watershed · #7080458390
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
175,2km²
Upstream area
4 125,8km²
Discharge
97,25m³/s
Mean elev.
182m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Pemigewasset River2677 km²
- Bassin de Winnipesaukee River1274 km²
1 dept-equivalent regions (GADM L2)
- 175.5 km²100.0% of basin
5 intersecting protected areas
Upper Merrimack Oxbow
IUCN VConservation Easement
1.18 km² overlap
Booth Property
IUCN VLocal Conservation Area
0.27 km² overlap
Fife Trust#2, Clarence C.
IUCN Not AssignedConservation Easement
0.25 km² overlap
Kimball Pond
IUCN VConservation Area
0.17 km² overlap
Conde - Bean Hill Farm
IUCN Not AssignedConservation Easement
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 106 distinct species · 102 156 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 Merrimack River : 25 espèces reliées par 73 interactions GloBI sur 4 types (connectance 12.3%, filtre Serrano α=0.2). 10 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°
6,8°C
Annual rain
1 050mm
Moisture idx (CMI)
0,09
Runoff
683mm/an
PET
955mm
AET
733mm
Mean slope
4,1°
Water table
276cm
Forest
95%
Crops
4%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)