Reynolds mountain east was established as a small research headwater catchment for the field measurement and process modeling of snow. The geology is a mixed lithology consisting of basalt and rhyolite. Snowdrifts (show picture of drift) are a huge part of the story in the headwaters of Reynolds Creek. The amount and distribution of snow affects what we see as streamflow. Some of the initial research in this watershed in the 60’s was to develop the snow pillow –a way of measuring solid precipitation or the amount of incoming snow. This research resulted in the observation of the importance of wind in redistributing the snow and development of iSNOWBAL, a physically based snow hydrology model. Other measurements over the years include eddy covariance (EC), which measures the exchange of water and carbon between the land surface and atmosphere. The catchment is currently used as a CORE site with EC measurements and automated soil respiration measurements. The catchment includes groundwater wells, nested sets of lysimeters, and soil moisture and temperature probes and groundwater and deep critical zone structure of the catchment are currently under way using a combination of field research, geophysics, and modeling.