HydroBASINS lev08 watershed · #7080014800

Bassin de Nehalem 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 : Clatsop, Columbia, Tillamook, Washington

Pfafstetter: 78100800

Sub-basin area

2 216,2km²

Upstream area

2 216,2km²

Discharge

124,5m³/s

Mean elev.

347m

Administrative coverage

4 dept-equivalent regions (GADM L2)

Clatsop
Oregon · United States
860.6 km²
38.7% of basin
Columbia
Oregon · United States
660.1 km²
29.7% of basin
Tillamook
Oregon · United States
550.9 km²
24.8% of basin
Washington
Oregon · United States
142.8 km²
6.4% of basin

8 intersecting protected areas

Jewell Meadows
IUCN V
Wildlife Area
11.95 km² overlap
Saddle Mountain
IUCN V
State Natural Area
0.55 km² overlap
Coal Creek Spruce
IUCN V
Wetlands
0.33 km² overlap
Nehalem Bay
IUCN V
State Natural Area
0.29 km² overlap
Wetlands Reserve Program (WRP), Tillamook, OR
IUCN V
Reserve Program
0.18 km² overlap
Saddle Mountain State
IUCN V
Natural Area Reserve
0.13 km² overlap
Nehalem Bay Wetlands Conservation Project, Phase II
IUCN V
Wetlands
0.08 km² overlap
North Nehalem Bay Wetlands Conservation Project
IUCN V
Wetlands
0.06 km² overlap

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

Species present

2 629 distinct species · 210 623 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 32 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 Nehalem River : 21 espèces reliées par 74 interactions GloBI sur 3 types (connectance 14.9%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.149

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°

9,0°C

Annual rain

2 215mm

Moisture idx (CMI)

0,62

Runoff

1 610mm/an

PET

830mm

AET

666mm

Mean slope

11,2°

Water table

370cm

Forest

99%

Crops

Urban

Protected

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