HydroBASINS lev08 watershed · #7080039630
Bassin de Hammonasset 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 : Middlesex, New Haven
Sub-basin area
609,9km²
Upstream area
609,9km²
Discharge
0,46m³/s
Mean elev.
58m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 371.1 km²60.8% of basin
- Middlesex212.4 km²34.8% of basin
30 intersecting protected areas
Hammonasset River - Hfa
IUCN VConservation Easement
8.48 km² overlap
Hammonasset
IUCN VNatural Area Preserve
3.79 km² overlap
Timberlands
IUCN Not AssignedLocal Other or Unknown
2.42 km² overlap
Hammonasset Beach State Park
IUCN IVMarine Protected Area
2.35 km² overlap
River Corridor
2.10 km² overlap
Marine Protected Area
1.68 km² overlap
Stewart B. Mckinney
IUCN IVNational Wildlife Refuge
1.38 km² overlap
Marine Protected Area
1.38 km² overlap
Branford Land Trust 3
IUCN VPrivate Conservation
1.31 km² overlap
21 more protected areassorted by overlap area
Branford Land Trust 1
IUCN VPrivate Conservation
1.22 km² overlap
Private Conservation
1.22 km² overlap
Private Conservation
1.17 km² overlap
Marine Protected Area
1.00 km² overlap
Deer
IUCN VLake
0.95 km² overlap
Private Conservation
0.95 km² overlap
Emergency Watershed Protection Program - Floodplain Easement (EWPP-FPE), New Haven, CT
IUCN Not AssignedWatershed Protection
0.91 km² overlap
Marine Protected Area
0.80 km² overlap
Great Harbor Wildlife Area
IUCN VIMarine Protected Area
0.71 km² overlap
Queach
IUCN Not AssignedConservation Easement
0.69 km² overlap
Private Conservation
0.69 km² overlap
East River Marsh
IUCN VWildlife Management Area
0.64 km² overlap
Marine Protected Area
0.56 km² overlap
State Resource Management Area
0.53 km² overlap
Greenwich Land Trust 1
IUCN VPrivate Conservation
0.51 km² overlap
Olde Orchard
IUCN VPrivate Conservation
0.51 km² overlap
Great Harbor
IUCN VWildlife Management Area
0.50 km² overlap
Private Conservation
0.45 km² overlap
Private Conservation
0.38 km² overlap
Dunk Rock Rd
IUCN VPrivate Conservation
0.38 km² overlap
Marine Protected Area
0.37 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 725 distinct species · 731 165 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Hammonasset River : 26 espèces reliées par 77 interactions GloBI sur 3 types (connectance 11.6%, filtre Serrano α=0.2). 11 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°
10,2°C
Annual rain
1 188mm
Moisture idx (CMI)
0,20
Runoff
844mm/an
PET
951mm
AET
779mm
Mean slope
2,5°
Water table
242cm
Forest
99%
Crops
4%
Urban
29%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)