HydroBASINS lev08 watershed · #7080588070
Bassin de Old 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 4 administrative regions : Alameda, Contra Costa, Sacramento, San Joaquin
Sub-basin area
1 622,4km²
Upstream area
53 384,8km²
Discharge
390,58m³/s
Mean elev.
128m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Middle River339 km²
- Bassin de North Mokelumne River237 km²
4 dept-equivalent regions (GADM L2)
- 752.4 km²46.4% of basin
- 574.3 km²35.4% of basin
- 197.5 km²12.2% of basin
- 78.6 km²4.8% of basin
29 intersecting protected areas
Preserve
14.32 km² overlap
Vasco Hills Regional
IUCN VPreserve
14.16 km² overlap
Preserve
11.83 km² overlap
Clayton Ranch Regional
IUCN VPreserve
9.87 km² overlap
Preserve
7.54 km² overlap
Dutch Slough
IUCN VState Conservation Area
4.80 km² overlap
Roddy Ranch
IUCN Not AssignedConservation Easement
4.43 km² overlap
Lower Sherman Island
IUCN VWildlife Area
3.91 km² overlap
Curry Canyon Ranch
IUCN VPrivate Conservation
3.76 km² overlap
20 more protected areassorted by overlap area
Quimby Island
IUCN VPrivate Conservation
3.20 km² overlap
Vasco Caves Regional
IUCN VPreserve
2.91 km² overlap
Reserve Program
2.63 km² overlap
Haera
IUCN Not AssignedMitigation Bank
2.11 km² overlap
Reserve Program
1.99 km² overlap
Holland Tract
IUCN Not AssignedConservation Easement
1.07 km² overlap
Viera-North Peak
IUCN VPrivate Conservation
0.72 km² overlap
Corral Hollow
IUCN VEcological Reserve
0.51 km² overlap
Anderson Ranch
IUCN VPrivate Conservation
0.39 km² overlap
Rhode Island
IUCN VWildlife Area
0.35 km² overlap
Wright Property
IUCN VPrivate Conservation
0.31 km² overlap
Antioch Dunes
IUCN IVNational Wildlife Refuge
0.21 km² overlap
Oak Hill Lane
IUCN VPrivate Conservation
0.17 km² overlap
Marsh Creek II
IUCN VPrivate Conservation
0.07 km² overlap
Marsh Creek I
IUCN VPrivate Conservation
0.04 km² overlap
Marsh Creek V
IUCN VPrivate Conservation
0.03 km² overlap
Marsh Creek VI
IUCN VPrivate Conservation
0.02 km² overlap
Dry Creek
IUCN VPrivate Conservation
0.02 km² overlap
Brushy Peak Regional
IUCN VPreserve
0.02 km² overlap
Marsh Creek IV
IUCN VPrivate Conservation
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 515 distinct species · 609 383 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Old River : 22 espèces reliées par 75 interactions GloBI sur 3 types (connectance 16.1%, 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°
15,5°C
Annual rain
359mm
Moisture idx (CMI)
-0,74
Runoff
137mm/an
PET
1 368mm
AET
305mm
Mean slope
3,7°
Water table
214cm
Forest
26%
Crops
34%
Urban
12%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)