HydroBASINS lev08 watershed · #7080587260
Bassin de Middle 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 : Contra Costa, San Joaquin
Sub-basin area
338,5km²
Upstream area
45 919,9km²
Discharge
321,74m³/s
Mean elev.
-3m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Bear Creek336 km²
- Bassin de San Joaquin River141 km²
2 dept-equivalent regions (GADM L2)
- 332.8 km²98.2% of basin
- 5.9 km²1.8% of basin
3 intersecting protected areas
Reserve Program
5.44 km² overlap
White Slough
IUCN VWildlife Area
2.00 km² overlap
Medford Island
IUCN Not AssignedConservation Easement
0.56 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
658 distinct species · 95 828 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 26 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 Middle River : 17 espèces reliées par 73 interactions GloBI sur 3 types (connectance 20.8%, filtre Serrano α=0.2). 10 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°
15,8°C
Annual rain
341mm
Moisture idx (CMI)
-0,76
Runoff
137mm/an
PET
1 396mm
AET
289mm
Mean slope
0,1°
Water table
10cm
Forest
48%
Crops
76%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)