HydroBASINS lev08 watershed · #7080621110
Bassin de South Fork Holston 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 7 administrative regions : Ashe, Carter, Grayson, Johnson, Smyth +2
Sub-basin area
834,1km²
Upstream area
834,1km²
Discharge
16,01m³/s
Mean elev.
893m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
7 dept-equivalent regions (GADM L2)
- 290.5 km²34.8% of basin
- Washington263.0 km²31.5% of basin
- Johnson247.4 km²29.7% of basin
- Grayson17.1 km²2.1% of basin
- Sullivan12.7 km²1.5% of basin
- 3.6 km²0.4% of basin
- Carter0.1 km²0.0% of basin
12 intersecting protected areas
Wildlife Management Area
146.25 km² overlap
Raccoon Branch
IUCN IbWilderness
17.10 km² overlap
Lewis Fork
IUCN IbWilderness
10.88 km² overlap
Birch Branch Fee
IUCN VPrivate Conservation Land
2.08 km² overlap
Orchard Road Bog Fee
IUCN VPrivate Conservation Land
0.60 km² overlap
Conservation Fund
IUCN VPreserve
0.42 km² overlap
Conservation Area
0.32 km² overlap
Smy-Vof-4039
IUCN Not AssignedConservation Easement
0.28 km² overlap
Quarry Bog Fee
IUCN VPrivate Conservation Land
0.25 km² overlap
3 more protected areassorted by overlap area
The Nature Conservancy
IUCN VEasement
0.23 km² overlap
Reserve Program
0.12 km² overlap
Schoolyard Springs Fee
IUCN VPrivate Conservation Land
0.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 136 distinct species · 56 189 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 South Fork Holston River : 27 espèces reliées par 69 interactions GloBI sur 4 types (connectance 9.3%, 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°
10,5°C
Annual rain
1 232mm
Moisture idx (CMI)
0,11
Runoff
585mm/an
PET
1 092mm
AET
911mm
Mean slope
10,0°
Water table
382cm
Forest
98%
Crops
13%
Urban
0%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)