HydroBASINS lev08 watershed · #7080531770

Bassin de South Fork Eel 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 : Humboldt, Mendocino

Pfafstetter: 77460040

Sub-basin area

1 766,5km²

Upstream area

1 766,5km²

Discharge

78,05m³/s

Mean elev.

508m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Eel River512 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

2 dept-equivalent regions (GADM L2)

Mendocino
California · United States
956.3 km²
54.1% of basin
Humboldt
California · United States
812.1 km²
45.9% of basin

14 intersecting protected areas

Usal Forest
IUCN Not Assigned
Conservation Easement
130.26 km² overlap
South Fork Eel River
IUCN Ib
Wilderness Area
52.75 km² overlap
Elkhorn Ridge
IUCN Ib
Wilderness Area
45.04 km² overlap
Angelo Coast Range
IUCN V
Reserve
17.26 km² overlap
Northern California Coast Range Preserve Macrosite
IUCN V
Preserve
16.51 km² overlap
Little Red Mountain
IUCN V
Ecological Reserve
11.91 km² overlap
John B. Dewitt Redwoods State
IUCN V
Natural Reserve
4.96 km² overlap
Smithe Redwoods State
IUCN V
Natural Reserve
2.82 km² overlap
Little Butte
IUCN V
Ecological Reserve
1.58 km² overlap

5 more protected areassorted by overlap area

Dillon
IUCN Not Assigned
Corridor
1.11 km² overlap
Sinkyone
IUCN Ib
Wilderness State Park
0.83 km² overlap
Mattole River
IUCN V
Ecological Reserve
0.58 km² overlap
Lost River
IUCN V
Private Conservation
0.24 km² overlap
Hartsook Inn
IUCN Not Assigned
Conservation Easement
0.10 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

3 606 distinct species · 110 428 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).

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de South Fork Eel River : 24 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 74 interactions GloBI sur 4 types (connectance 11.1%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.111

Patrimoniales

Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

11,2°C

Annual rain

1 665mm

Moisture idx (CMI)

0,32

Runoff

1 183mm/an

PET

1 131mm

AET

665mm

Mean slope

14,5°

Water table

500cm

Forest

94%

Crops

Urban

Protected

18%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)