HydroBASINS lev08 watershed · #7080012480
Bassin de Santa Margarita 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 : Riverside, San Diego
Sub-basin area
1 892,1km²
Upstream area
1 892,3km²
Discharge
7,54m³/s
Mean elev.
700m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 1391.1 km²73.5% of basin
- 500.1 km²26.4% of basin
29 intersecting protected areas
Reserve
55.01 km² overlap
Beauty Mountain
IUCN IbWilderness Area
54.67 km² overlap
Agua Tibia
IUCN IbWilderness
53.80 km² overlap
Santa Rosa Plateau
IUCN VEcological Reserve
36.15 km² overlap
Cahuilla Mountain
IUCN IbWilderness
20.71 km² overlap
Beauty Mountain
IUCN IbWilderness Study Area
15.48 km² overlap
Santa Margarita
IUCN VEcological Reserve
14.01 km² overlap
San Felipe Valley
IUCN VWildlife Area
12.61 km² overlap
Santa Margarita River
IUCN VPreserve
5.58 km² overlap
20 more protected areassorted by overlap area
Santa Margarita
IUCN VEcological Reserve
4.27 km² overlap
Margarita Peak
IUCN VPreserve
3.84 km² overlap
Cahuilla Mountain
IUCN IaResearch Natural Area
2.95 km² overlap
French Valley
IUCN VWildlife Area
2.70 km² overlap
Triple Creeks
IUCN VConservation Area
2.45 km² overlap
Agua Tibia
IUCN IbWilderness Area
2.12 km² overlap
Agua Tibia
IUCN IaResearch Natural Area
1.00 km² overlap
Emerson Oaks
IUCN VReserve
0.95 km² overlap
Santa Margarita
IUCN VPreserve
0.85 km² overlap
Durling
IUCN VPreserve
0.76 km² overlap
Santa Margarita River
IUCN VEasement
0.65 km² overlap
Cole Canyon Natural
IUCN VPark
0.41 km² overlap
Rock Mountain
IUCN VPreserve
0.31 km² overlap
Rainbow
IUCN VPreserve
0.16 km² overlap
Warm Springs Park and
IUCN VPreserve
0.10 km² overlap
Santa Rosa Plateau Ecological Reserve, Tenaja Corridor, Expansion 5
IUCN Not AssignedEcological Reserve
0.07 km² overlap
Preserve
0.07 km² overlap
Base
0.03 km² overlap
Vintage Reser
IUCN VReserve
0.02 km² overlap
San Mateo Canyon
IUCN IbWilderness
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 033 distinct species · 546 538 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Santa Margarita River : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 86 interactions GloBI sur 4 types (connectance 12.9%, 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°
15,8°C
Annual rain
422mm
Moisture idx (CMI)
-0,70
Runoff
116mm/an
PET
1 407mm
AET
358mm
Mean slope
6,7°
Water table
479cm
Forest
45%
Crops
5%
Urban
11%
Protected
8%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)