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22 I I I I I I I I I I I 1 I 1 I I I I I . The Yampa River study areas were also very low gradient and precision in the channel profile is very important in order for the model to successfully run. RECOMMENDATIONS AND ADJUSTMENTS TO STUDY DESIGN 1. An RTK GPS system was purchased with the intent of decreasing the time needed to survey portions of the river channel. The new system will use a GPS to give a position and an echo sounder to give a depth for that position. This system will be tested in the 1999 field season in the IS-mile reach of the Colorado River. If successful and efficient the study area of the Colorado River should be mapped in July 1999. This system will also be used to survey portions of the representative reaches of the Duffy and Sevens sites in July 1999. 2. I am considering adding a third study site to the Yampa River in the Lily Park area. This site has the highest proportion of native fish in the Yampa River. The addition of this site will depend on funding and time constraints and will be tentatively added to the 2000 field season. ACKNOWLEDGEMENTS The hydraulic modeling was contracted with Colorado State University, the Department of Earth Resources. The contract was administered and supervised by pro . Ellen Wohl and Greg Stewart performed the work for a M.S. project. Greg supervised the habitat quantification portion in the field and performed the hydraulic modeling. I greatly appreciated the enthusiasm and energy Greg put into this study and the long hours he spent on learning and calibrating the SMS model. District Wildlife Managers, Brad Petch and Chuck Woodward, were very helpful and provided valuable assistance and information concerning landowners and logistics. I am very grateful to Tom Deacons who allowed us access to the river on his property in the Duffy area. Also, I would like to thank the Cross Mountain Ranch and Phil George for allowing access to the Sevens Ranch for habitat surveying and the other property owners on the river that granted us access for electrofishing.