HydroBASINS lev08 watershed · #7080470790

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 2 administrative regions : Hillsborough, Rockingham

13% lakePfafstetter: 73118051

Sub-basin area

94,6km²

Upstream area

8 953,3km²

Discharge

184,77m³/s

Mean elev.

70m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Beaver Brook586 km²

▲ Receives from 2 basins

Bassin de Souhegan River453 km²
Bassin de Merrimack River408 km²

2 dept-equivalent regions (GADM L2)

Hillsborough
New Hampshire · United States
76.2 km²
80.4% of basin
Rockingham
New Hampshire · United States
18.6 km²
19.6% of basin

8 intersecting protected areas

George Parcel
IUCN V
Local Conservation Area
0.54 km² overlap
Lordes Parcel
IUCN V
Local Conservation Area
0.31 km² overlap
Airport
IUCN V
Mitigation
0.21 km² overlap
Large White Lot
IUCN V
Local Conservation Area
0.18 km² overlap
White Lot
IUCN V
Local Conservation Area
0.12 km² overlap
Sunnycrest Orchards
IUCN Not Assigned
Conservation Easement
0.10 km² overlap
Sunnycrest Orchards Phase II
IUCN Not Assigned
Conservation Easement
0.09 km² overlap
Lot 5-10-40
IUCN V
Local Conservation Area
0.02 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

1 379 distinct species · 73 797 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 43 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de Merrimack River : 30 espèces reliées par 117 interactions GloBI sur 4 types (connectance 13.0%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

117

Connectance

0.130

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

8,3°C

Annual rain

1 076mm

Moisture idx (CMI)

0,09

Runoff

706mm/an

PET

979mm

AET

747mm

Mean slope

1,8°

Water table

154cm

Forest

82%

Crops

Urban

32%

Protected

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)