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INTRODUCTION AND BACKGROUND As part of the Inter-Agency Agreement No. 6-AA-40-04070 between the Bureau of Reclamation (Bureau) and Fish and Wildlife Service (Service) to study and simulate the operations of the Aspinall Unit (Unit), the Service has constructed a model of the Unit and provides the following report. This report is meant to serve as the technical documentation and completion report for one of the .hydrological studies. The purpose of this work task is to simulate the operation of the Unit using a computerized accounting model. The simulation will be used to evaluate the operation of the Unit under differing management schemes. These schemes are being designed and tested as the study progresses and have as their ultimate goal the improvement of habitat conditions for endangered Colorado River fishes while minimizing the impact on power revenues and operational flexibility. A secondary purpose of the study is to extend the HYDrological River Operations Study System (HYDROSS) model to include the upper reaches of the Gunnison River. The simulation includes Taylor Reservoir, which is important to the study because it is the starting point of the Colorado River Simulation System (CRSS) model on the Gunnison River, and as such provides an ideal linking point between the two models. The operation of Taylor Reservoir is also important to the study in that the operation of Taylor is closely tied to the operation of the Unit. These extensions were included in the study so that the Service could have a comprehensive model of the Upper Colorado River Basin which accurately reflects flaw conditions at each of the habitat sites selected for intensive evaluation as a part of the Research and Monitoring Agreement, Inter-Agency Agreement No. 6-AA-40- 04070. The agreement allows the Service the opportunity to implement a new version of the HYDROSS model which has enhanced reservoir operations capabilities. GENERAL DESCRIPTION OF MODEL HYDROSS 3.0 was recently completed by the Bureau of Reclamation's Billings office and was provided to the Service far testing and use in the Upper Colorado River Basin. The advantage of HYDROSS 3.0 over previous versions is that it uses five reservoir index levels and has the capability of balancing reservoirs based upon user input capacity targets. The model is a system of computer programs for conducting monthly water supply studies along traditional accounting lines. The system allows the user to conduct "what if" studies by varying the physical and operational parameters of the model. 1