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I. INTRODUCTION The Grand Valley Irrigation Company (GVIC) diversion structure is the most downstream of three low head structures on the Upper Colorado River which preclude the passage of endangered Colorado River fish into historic habitat further upstream. The other two structures are the Price/Stubb and the Government Highline Diversion Dam. Whereas, the GVIC diversion is only a barrier to passage at low and moderate flows, the other two diversion structures prevent passage at all flow conditions. As part of the Recovery Implementation Program for Endangered Colorado River fish species, a program is proposed to re-establish endangered fish passage above this reach which starts approximately 15 miles upstream of the Gunnison River confluence. A similar program is underway on the Gunnison River where a fish passage structure at the Redlands Diversion Dam was completed in the spring of 1996. This document presents alternatives to establish fish passage at the GVIC diversion. Its purpose is to provide key' project participants with an opportunity to provide input to the GVIC fish passage structure design process. The objectives of this document are to present an overall view of potential solutions to endangered fish passage at the GVIC structure and stimulate input from the various participants for the selection of an alternative. By distributing this report at this stage, interested parties have an opportunity to respond to the presented alternatives and address key issues such as: the compatibility of the alternatives with Orchard Mesa Irrigation District (OMID) and GVIC operations, biological factors that may make one alternate preferable to another, ideas for modifications to a proposed alternative, and evaluation of the pros and cons of each alternate from the perspective of the various project participants. The analysis of these issues will lead to a selection of one of the presented alternatives. The overall objective of the work being conducted by FLO Engineering, Inc. under contract to the United States Bureau of Reclamation is to evaluate alternatives to modify the GVIC diversion dam to allow for passage of Colorado River fish species. The final product of the work effort will .include the conceptual design of the selected alternative; development of basic design information to support the final design process, including hydraulics, hydrology, and mapping; and, recommendations to assist in the development of the f+nal design. The final design and permitting phase are scheduled for completion by May 1997 with intent of awarding a construction contract by August 1997. 1