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I I I I I I I I I I I I I I I I I I I checked, since fish or woody debris can sometimes cause spikes in the sonar data. Spikes were eliminated based on the running average of the 3 sonar pings prior to and after a given sonar ping. If the elevation recorded in a given reading was different than the moving average of the 6 readings surrounding the given reading by more than 15cm, that ping was marked as "bad". If an RTK GPS reading had a "bad" sonar ping recorded directly before or after it, that GPS reading was ignored. For those RTK GPS signals with "good" sonar recordings before and after them, the depth for that GPS position was determined through a linear interpolation of the sonar data based on the time tags. Topographic data were also examined visually using ArcView. In ArcView bed elevations could be examined by using the Triangular Irregular Network (TIN) module or by color coding coordinate points by elevation. Hvdraulic Simulation In the first two years of the project hydraulic simulation and 2-D flow modeling was contracted with the Earth Resources Department of Colorado State University (CSU). Greg Stewart, a graduate student at CSU, collected, input the data for hydraulic modeling and performed the analysis during the time period June of 1998 to June 2000. Last years progress report and the M.S. thesis authored by Mr. Stewart details hydraulic methods, problems and innovations used for making flow simulations on the Colorado River IS-Mile Reach (Corn Lake) and the Yampa River site at Duffy Tunnel. For documentation on modeling techniques refer to those reports. Greg Stewart was instrumental in installation and operation of technical equipment and data handing for the 2-D modeling and his departure from the project meant no new 2-D modeling until a replacement contractor was found. An attempt to instate anew contract (sole source) to continue hydraulic simulations in 2000/20001 fiscal year failed, therefore only 17