HydroBASINS lev08 watershed · #7080013470
Bassin de San Leandro Creek
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 3 administrative regions : Alameda, Contra Costa, San Francisco
Sub-basin area
810,6km²
Upstream area
810,6km²
Discharge
0,39m³/s
Mean elev.
112m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 425.9 km²52.5% of basin
- 339.2 km²41.8% of basin
- 2.2 km²0.3% of basin
29 intersecting protected areas
Fernandez Ranch
IUCN VPrivate Conservation
2.81 km² overlap
Sibley Volcanic Regional
IUCN VPreserve
2.75 km² overlap
Montanera Wilder
IUCN Not AssignedConservation Easement
2.44 km² overlap
Franklin Canyon
IUCN VPrivate Conservation
1.91 km² overlap
Wilder Monanera
IUCN Not AssignedConservation Easement
1.67 km² overlap
Eden Landing
IUCN VEcological Reserve
1.34 km² overlap
Sobrante Ridge Regional
IUCN VPreserve
1.12 km² overlap
Preserve
0.95 km² overlap
Mulholland Open Spac
IUCN VOpen Space
0.95 km² overlap
20 more protected areassorted by overlap area
Sky Ranch
IUCN VPrivate Conservation
0.95 km² overlap
Reserve
0.82 km² overlap
Waterbird Regional
IUCN VPreserve
0.80 km² overlap
Dutra Ranch
IUCN VPrivate Conservation
0.62 km² overlap
Stonehurst
IUCN Not AssignedConservation Easement
0.59 km² overlap
Marine Protected Area
0.57 km² overlap
Point Edith
IUCN VWetlands
0.47 km² overlap
Hillside
IUCN VNatural Area
0.40 km² overlap
Hayward
IUCN Not AssignedShoreline
0.38 km² overlap
Brooks Island Regional
IUCN VPreserve
0.35 km² overlap
Gustin
IUCN VPrivate Conservation
0.32 km² overlap
National Wildlife Refuge
0.13 km² overlap
Wilderness
0.10 km² overlap
Marine Protected Area
0.04 km² overlap
Bodfish
IUCN VPreserve
0.03 km² overlap
Marine Protected Area
0.03 km² overlap
Preserve
0.03 km² overlap
North Richmond
IUCN VWetlands
0.01 km² overlap
Briones/Martinez
IUCN Not AssignedTrail
0.00 km² overlap
Nichol
IUCN Not AssignedPark
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
10 267 distinct species · 3 836 025 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 San Leandro Creek : 28 espèces reliées par 79 interactions GloBI sur 3 types (connectance 10.7%, 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°
14,4°C
Annual rain
607mm
Moisture idx (CMI)
-0,43
Runoff
231mm/an
PET
1 075mm
AET
505mm
Mean slope
5,7°
Water table
300cm
Forest
31%
Crops
1%
Urban
58%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)