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. Significant differences in density and biomass between the three study sites could be related to differences in habitat composition. . The 2-D modeling contract was vital for establishing data sampling protocols. The RTK GPS and echo sounder system proved very effective for surveying large sections of river. The project is now adequately equipped to survey river sections. . The 2-D flow modeling clearly produces excellent habitat mapping results and is absolutely necessary for this project to develop instream flow recommendations for the Yampa and Colorado Rivers. The 2-D modeling is still problematic mainly because ofthe large amount oftime required to calibrate and run the model for a set of desired flows. It is not likely that modeling efficiency will improve without significant upgrades to the RMA2 software. . Without a new contract for 2-D flow modeling, sampling sites and fish sampling will be reduced to give more time to the researcher for modeling and reporting. . Additional information on the perrormance and practicality of the 2-D model will be included in the M.S. Thesis by Greg Stewart. RECOMMEND A nONS and ADJUSTMENTS TO STUDY DESIGN I. In the 2000 tield season, efforts will be made to sample a section on the Dolores River, the Lily Park reach on the Yampa River and a new site on the Colorado River. Spring runoff is very low in 2000 and could hamper field surveying because oflow flows. 2. At the time of this report there is no contract set up for 2-D modeling. Efforts to get a graduate project to replace Greg Stewart have been unsuccessful so far. Efforts will be made to contract with a private consultant or with Utah State University. The Water Research Laboratory in Logan has a graduate program that uses and tests 2-D and 3-D flow models. This department has a full time staff capable of adapting the model to specific projects. 46 I I I I I I I I I I I I I I I I I I ,