HydroBASINS lev08 watershed · #7080421730
Bassin de Pahsimeroi 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 : Custer, Lemhi
Sub-basin area
2 132,6km²
Upstream area
2 132,8km²
Discharge
11,3m³/s
Mean elev.
2 245m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- CusterIdaho · United States1447.8 km²67.7% of basin
- LemhiIdaho · United States689.3 km²32.3% of basin
7 intersecting protected areas
Burnt Creek
IUCN IbWilderness Study Area
74.74 km² overlap
Goldburg
IUCN IbWilderness Study Area
16.44 km² overlap
Mahogany Creek
IUCN IaResearch Natural Area
13.24 km² overlap
Upper Salmon River
IUCN VEasement
6.78 km² overlap
Pahsimeroi Valley
IUCN VEasement
3.36 km² overlap
Merriam Lake Basin
IUCN IaResearch Natural Area
2.87 km² overlap
Mill Lake
IUCN IaResearch Natural Area
0.21 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 019 distinct species · 6 558 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Pahsimeroi River : 18 espèces reliées par 130 interactions GloBI sur 4 types (connectance 15.9%, filtre Serrano α=0.2). 23 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°
1,9°C
Annual rain
340mm
Moisture idx (CMI)
-0,58
Runoff
169mm/an
PET
876mm
AET
297mm
Mean slope
13,0°
Water table
463cm
Forest
44%
Crops
4%
Urban
0%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)