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I I I I I I I I I I I I I I I I I r I Clition. Colorado River The Clifton site is located 0.4 km upstream of Com Lake and is 4.25 kilometer in length. A total of 45,000 usable bathymetric survey points were collected using the GPS/sonar method on May 31, and June 1,2,4 and 5, 2000. Flows during this period varied between 10,000 and J 3,000 cfs. Waterline/water surface measurements were made by the walking method on August I, 2 and 3, 2000; January 23, 24, 25 and 26, 2001; and (the final set) June 18,19 and 20, 2001. Duff!.'. Yampa River Bathymetric data was collected along a 2.25 km section of the Yampa River near the Duffy Tunnel using the GPS/sonar method during the period of July 91h to July 11th, 1999. From July 27lh through July 291h 1999, the walking method was used to survey waterlines and shallow ri files. Se"Cl1S, Yampa Riw>r On July 12, 1999, bathymetric data were collected using the GPS/sonar technique along a 1.3-km section of the Yampa River at the Sevens study section. The length of this site was believed to be to short given the nature of the associated fish data and the habitats represented in this reach. The Sevens site was enlarged on June 23, 2000, by surveying another 1.3 krn immediately upstream and overlapping the site mapped the previous year. These surveys used the same boat and GPS/sonar equipment. To compare bed and water surface elevations between years, three longitudinal profiles were obtained in the 1999 site and water lines and were recorded for the entire 2.6 km station. Collection of bathymetric data was hampered in 2000 by the low and unusually short runoff period. -., ~" -. The base pin established in 1998 was used as the reference position for both the 1999 and 2000 surveys. Shoreline and water surface shots were made using the walking method. Waterline shots for the entire reach were surveyed on October 30 and 31, 2000. Another series of water edge/surface shots were made in June 26 & 27 and July 5 & 6 200 I. Lily Park, Yampa River Bathymetric data were collected using the GPS/sonar technique along a 3.3-krn section of the Yampa River at Lily Park on June 12, 13 and 14,2000. Collection of bathymetric data was hampered in 2000 by the low and unusually short runoff period. There was a large, wide and shallow riffle near mid-station that could not be surveyed by boat. Therefore, walking method was employed to survey shallow riffles on August 8 and 9 and again on October 19 and 20, 2000. Waterline shots were made on June 27 and 28,2001, and at a lower flow on July 31 and August 1. 17