HydroBASINS lev08 watershed · #7080012630
Bassin de San Gabriel 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 3 administrative regions : Los Angeles, Orange, San Bernardino
Sub-basin area
2 103,6km²
Upstream area
2 103,6km²
Discharge
12,38m³/s
Mean elev.
568m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 1841.2 km²87.5% of basin
- Orange231.7 km²11.0% of basin
- 29.7 km²1.4% of basin
30 intersecting protected areas
San Gabriel Mountains
IUCN VNational Monument
689.56 km² overlap
Sheep Mountain
IUCN IbWilderness
165.81 km² overlap
San Gabriel
IUCN IbWilderness
144.51 km² overlap
Claremont Hills
IUCN VWilderness Park
8.45 km² overlap
Falls Canyon
IUCN IaResearch Natural Area
5.83 km² overlap
Fern Canyon
IUCN IaResearch Natural Area
5.34 km² overlap
Monrovia
IUCN VWilderness Preserve
4.55 km² overlap
Big Dalton
IUCN VWilderness Park
3.68 km² overlap
Los Cerritos
IUCN VWetlands
1.91 km² overlap
21 more protected areassorted by overlap area
Duarte
IUCN VWilderness Preserve
1.64 km² overlap
Pleasant View Ridge
IUCN IbWilderness
1.58 km² overlap
South Hills
IUCN VWilderness Area
1.18 km² overlap
Brodiaea
IUCN VReserve
1.08 km² overlap
Panorama
IUCN VNature Reserve
0.89 km² overlap
Huntington Library and
IUCN VBotanical Gardens
0.84 km² overlap
Corridor
0.75 km² overlap
Park
0.65 km² overlap
West Marshall Canyon
IUCN VWilderness Area
0.64 km² overlap
Arcadia
IUCN VWilderness Park
0.43 km² overlap
Robert E. Ward
IUCN VNature Preserve
0.31 km² overlap
River
IUCN VWilderness Park
0.29 km² overlap
Bailey Canyon
IUCN VWilderness
0.29 km² overlap
Bluebird
IUCN VPreserve
0.28 km² overlap
Walnut Creek
IUCN VWilderness Park
0.23 km² overlap
Gordon Mull
IUCN VPreserve
0.17 km² overlap
Galster
IUCN VWilderness Park
0.17 km² overlap
Wilderness
IUCN VPark
0.07 km² overlap
Bailey Canyon
IUCN VWilderness Park
0.04 km² overlap
Golden Hills
IUCN VWilderness Park
0.04 km² overlap
Blaisdell
IUCN VPreserve
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
9 278 distinct species · 4 129 289 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Gabriel River : 22 espèces reliées par 75 interactions GloBI sur 3 types (connectance 13.4%, filtre Serrano α=0.2). 12 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°
16,1°C
Annual rain
506mm
Moisture idx (CMI)
-0,62
Runoff
148mm/an
PET
1 361mm
AET
416mm
Mean slope
10,1°
Water table
478cm
Forest
50%
Crops
1%
Urban
56%
Protected
23%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)