2006 Annual Report 4d.Progress report. This report serves to document research conducted under a specific cooperative agreement with the University of Idaho (INFLUENCE OF SUB-GRID VARIABILITY ON SNOW DEPOSITION AND ABLATION IN NORTH AMERICAN MOUNTAIN ENVIRONMENTS - 03S). Additional details of research can be found in the report for the parent CRIS 5362-13610-006-00D Characterization, Prediction and Scaling of Rangeland Watershed and Streamflow Processes. Intensive automated data collection continued at Reynolds Creek Experimental Watershed (RCEW) including basic micrometerological data and eddy correlation (EC) data. EC data collection and processing continued, with the addition of a second EC system over an aspen grove and an EC system over big mountain sagebrush in Upper Sheep Creek, and the addition of a 20-m walk-up tower and EC system over the aspen in Reynolds Mtn. East (RME). Most of the problems processing the 10-Hz data have been worked out, and analysis of corrected fluxes has begun. Initial analysis shows that summary fluxes are biased 15-30% high when compared to fluxes derived from the processed 10-Hz data. The PhD student (Michele Reba) working on the EC data advanced to candidacy in May, 2006, and has begun final data processing and analysis required for her dissertation. Comparative analysis of EC flux data from Wolf Creek, Marmot Creek, RCEW, and Fraser in Colorado has been initiated.