ARCHIVED CONTENT: In December 2020, the CZO program was succeeded by the Critical Zone Collaborative Network (CZ Net) ×


The Eel River CZO is largely based in the Eel River watershed in Northern California and is composed of nested components, increasing in scale from an intensively instrumented hillslope to a region encompassing the Eel watershed. 

The observatory component leverages the development and use of past infrastructure investments and historical research insights.

Fox creek lodge facitlities.

Field Areas:

Eel River Watershed

9540.0 km2, 0-2464 m elevation,

The Eel River Watershed (9,540 km2) is a steep mostly undammed Northern California coastal river eroding rapidly through mechanically weak rock with active uplift. Both watershed-climate-ocean productivity investigations and education & outreach have occurred here (supported by prior NSF funds and in collaboration with Friends of the Eel River and the Eel River Recovery Project).

Angelo Coast Range Reserve

31 km2, 120-1260 m elevation, 10.1 °C,

Sagehorn-Russell Ranch

21 km2, 460-980 m elevation,


0.004 km2, 400-470 m elevation,