HydroBASINS lev08 watershed · #7080041220
Bassin de Patuxent 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 6 administrative regions : Anne Arundel, Calvert, Frederick, Howard, Montgomery +1
Sub-basin area
1 675,4km²
Upstream area
1 675,4km²
Discharge
26,55m³/s
Mean elev.
82m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- 593.9 km²35.4% of basin
- Howard485.4 km²29.0% of basin
- 317.6 km²18.9% of basin
- Montgomery155.4 km²9.3% of basin
- 114.9 km²6.8% of basin
- 0.2 km²0.0% of basin
30 intersecting protected areas
Patuxent Research
IUCN IVRefuge
48.80 km² overlap
Putuxent River
IUCN IIIPark
13.28 km² overlap
Patuxent River
IUCN IIIPark
9.16 km² overlap
Chesapeake Bay National Estuarine Research Reserve - Maryland National Estuarine Research Reserve
IUCN IVMarine Protected Area
8.39 km² overlap
T. Howard Duckett Watershed
IUCN IIIWatershed
5.85 km² overlap
Duvall Road Nca
IUCN VLocal Conservation Area
5.41 km² overlap
DNR
IUCN Not AssignedConservation Easement
2.31 km² overlap
Belt Woods
IUCN VHeritage Conservation
2.07 km² overlap
Jug Bay Wetlands
IUCN IIISanctuary
1.86 km² overlap
21 more protected areassorted by overlap area
Billingsley
IUCN VNatural Resource Management Area
1.77 km² overlap
Collington Branch
IUCN IIIPark
1.50 km² overlap
Hall Creek
IUCN VNatural Resource Management Area
1.37 km² overlap
Oxbow
IUCN IIINatural Area
1.22 km² overlap
Maryland Environmental Trust Easement #119
IUCN Not AssignedEasement
1.01 km² overlap
Gorman Area
IUCN IIILocal Park
0.98 km² overlap
Full Mill Branch
IUCN VNatural Resource Management Area
0.74 km² overlap
House Creek
IUCN VNatural Resource Management Area
0.62 km² overlap
Globe Comm Nrma
IUCN VLocal Conservation Area
0.60 km² overlap
Savage
IUCN IIIPark
0.56 km² overlap
Merkle
IUCN VNatural Resource Management Area
0.46 km² overlap
Reddy Branch Svu
IUCN VLocal Conservation Area
0.45 km² overlap
Croom
IUCN VNatural Resource Management Area
0.43 km² overlap
Belt Woods
IUCN VNatural Environment Area
0.43 km² overlap
High Ridge
IUCN IIIPark
0.41 km² overlap
Bowen
IUCN VWildlife Management Area
0.39 km² overlap
Bald Hill Stream Valley
IUCN IIILocal Park
0.34 km² overlap
Maryland Environmental Trust Easement #10
IUCN Not AssignedEasement
0.29 km² overlap
Patuxent River Watershed
IUCN IIIWatershed
0.24 km² overlap
Patuxent Oxbow
IUCN VHeritage Conservation
0.20 km² overlap
Montgomery County
IUCN Not AssignedEasement
0.20 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 827 distinct species · 4 413 230 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 Patuxent River : 26 espèces reliées par 66 interactions GloBI sur 3 types (connectance 11.1%, filtre Serrano α=0.2). 9 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°
12,6°C
Annual rain
1 075mm
Moisture idx (CMI)
-0,03
Runoff
499mm/an
PET
1 111mm
AET
845mm
Mean slope
1,7°
Water table
112cm
Forest
67%
Crops
18%
Urban
31%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)