HydroBASINS lev08 watershed · #7080013530
Bassin de San Ramon 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 2 administrative regions : Alameda, Contra Costa
Sub-basin area
444,9km²
Upstream area
445km²
Discharge
2,43m³/s
Mean elev.
188m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 444.0 km²99.7% of basin
- 1.1 km²0.3% of basin
13 intersecting protected areas
Wilderness
20.67 km² overlap
Clayton Ranch Regional
IUCN VPreserve
6.46 km² overlap
Open Space
2.52 km² overlap
Mangini Ranch
IUCN VPrivate Conservation
0.87 km² overlap
Point Edith
IUCN VWildlife Area
0.39 km² overlap
Point Edith
IUCN VWetlands
0.38 km² overlap
Bishop Ranch Regional
IUCN VRegional Open Space
0.21 km² overlap
Preserve
0.15 km² overlap
Gateway
IUCN Not AssignedConservation Easement
0.15 km² overlap
4 more protected areassorted by overlap area
Young Canyon
IUCN VPrivate Conservation
0.09 km² overlap
Lot 25
IUCN VPrivate Conservation
0.02 km² overlap
Waterbird Regional
IUCN VPreserve
0.00 km² overlap
Mulholland Open Spac
IUCN VOpen Space
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 575 distinct species · 932 658 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 44 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 Ramon Creek : 36 espèces reliées par 86 interactions GloBI sur 4 types (connectance 9.1%, filtre Serrano α=0.2). 8 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°
14,7°C
Annual rain
526mm
Moisture idx (CMI)
-0,56
Runoff
187mm/an
PET
1 200mm
AET
445mm
Mean slope
6,9°
Water table
366cm
Forest
37%
Crops
4%
Urban
61%
Protected
11%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)