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T-'1' '$ I. I ~. . ~. ""-- 1. INTRODUCTION The Colorado River Recovery Program Director and Water Acquisition Committee have identified a need to better define the requirements, appropriate methodologies, and levels of effort for a sediment monitoring program to help define habitat requirements for endangered native fish in the Yampa, Little Snake, and Green Rivers. To meet that need, an independent peer review panel was formed to review historical data, review the status of ongoing data collection efforts, identify sediment issues as they relate to recovery of endangered fishes, and develop recommendations for future sediment work to support Program efforts. The peer review panel was established under the direction of Mr. George Smith, U.S. Fish & Wildlife Service (USFWS), and consisted of the following individuals: Dr. Bob Mussetter, Mussetter Engineering, Inc. (Workshop Coordinator) Dr. Mike Harvey, Mussetter Engineering, Inc. (MEI) Dr. Ned Andrews, U.S. Geological Survey (USGS) Mr. John Elliott, USGS Mr. Paul Von Guerard, USGS Dr. Jim O'Brien, FLO Engineering, Inc. Other interested individuals who provided input to the panel included: Mr. Ed Wick, National Park Service Mr. Bill Fullerton, FLO Engineering, Inc. Mr. Henry Maddux, USFWS Mr. Dave Merritt, Colorado River Water Conservation District To support the peer review panel's work, Mussetter Engineering, Inc. (MEI) identified and summarized existing sediment and river channel data for the Green, Yampa, and Little Snake Rivers. The data summary was subsequently reviewed by other members of the peer review panel. This report represents the final version of the data summary which incorporates appropriate changes and additions based on the review comments. 2. EXISTING DATA The data contained in this document were compiled from a variety of sources, including published USGS data from established stream gages, published papers and reports, and unpublished data obtained directly from individuals who have performed work in the area of interest. The river reaches that were of specific interest to the peer review panel included the Green River from the confluence with the Colorado River upstream to Flaming Gorge Dam, the Yampa River from the confiuence with the Green River upstream to the USGS gage near Maybell, Colorado (USGS gage 09251000), and the downstream approximately 12 miles of the Little Snake River from the mouth to just upstream of Powder Wash Road (Plate 1). For clarity of presentation, the data were divided into two categories: (1) published data collected on a regular basis at established USGS stream gages, and (2) other data collected as part of individual studies or study programs. 2.1 Data from USGS Stream Gages Tables 1 through 4 summarize the available instantaneous peak flow, mean daily flow, suspended sediment load, and bed material gradations that were collected at established USGS 1 Mussetter Engineering. Inc.