HydroBASINS lev08 watershed · #7080754810
Bassin de Colorado 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 4 administrative regions : Burnet, Hays, Travis, Williamson
Sub-basin area
1 545,5km²
Upstream area
97 927,5km²
Discharge
101,31m³/s
Mean elev.
268m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Colorado River928 km²
- Bassin de Pedernales River146 km²
4 dept-equivalent regions (GADM L2)
- 1352.2 km²87.6% of basin
- 110.7 km²7.2% of basin
- 55.9 km²3.6% of basin
- Williamson25.2 km²1.6% of basin
30 intersecting protected areas
Balcones Canyonlands
IUCN VNational Wildlife Refuge
77.48 km² overlap
Balcones Canyonlands
IUCN VPreserve
74.39 km² overlap
Shield Ranch
IUCN VEasement
19.32 km² overlap
Private Conservation Land
16.41 km² overlap
Walnut Creek
IUCN VGreenbelt
3.95 km² overlap
Barton Creek
IUCN VGreenbelt
3.40 km² overlap
Preserve
1.90 km² overlap
Canyon Ck
IUCN VLocal Conservation Area
1.82 km² overlap
Camp Chautauqua
IUCN VRegional Preserve
0.97 km² overlap
21 more protected areassorted by overlap area
Bright Leaf
IUCN VNatural Area
0.87 km² overlap
Upper Bull Creek
IUCN VGreenbelt
0.77 km² overlap
Private Conservation Land
0.66 km² overlap
Lower Bull Creek
IUCN VGreenbelt
0.51 km² overlap
Gaines Creek
IUCN VGreenbelt
0.49 km² overlap
Colorado/Walnut
IUCN VGreenbelt
0.41 km² overlap
Discovery Well Cave
IUCN VPreserve
0.40 km² overlap
Canyonlands
IUCN VPark
0.36 km² overlap
Shoal Creek
IUCN VGreenbelt
0.33 km² overlap
St. Edwards
IUCN VGreenbelt
0.32 km² overlap
Zilker
IUCN VNature Preserve
0.31 km² overlap
East Boggy Creek
IUCN VGreenbelt
0.30 km² overlap
Boggy Creek
IUCN VGreenbelt
0.20 km² overlap
Big Walnut Creek
IUCN VNature Preserve
0.18 km² overlap
Sanctuary
0.17 km² overlap
Blunn Creek
IUCN VNature Preserve
0.16 km² overlap
Steck Valley
IUCN VGreenbelt
0.16 km² overlap
North Cat Mountain
IUCN VGreenbelt
0.12 km² overlap
Twin Creeks
IUCN VGreenbelt
0.08 km² overlap
Mayfield
IUCN VNature Preserve
0.08 km² overlap
Stillhouse Hollow
IUCN VNature Preserve
0.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
9 781 distinct species · 3 820 560 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 Colorado River : 26 espèces reliées par 76 interactions GloBI sur 3 types (connectance 12.1%, 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°
19,4°C
Annual rain
823mm
Moisture idx (CMI)
-0,44
Runoff
168mm/an
PET
1 466mm
AET
696mm
Mean slope
3,2°
Water table
315cm
Forest
80%
Crops
6%
Urban
33%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)