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<br />) <br /> <br />COLORADO RIVER RECOVERY PROGRAM <br />FV.ss ANNUAL PROJECT REPORT <br /> <br />RECOVERY PROGRAM <br />PROJECT NO. YamDa Plan C F\ {l <t <br /> <br />I. Project Title: Green and Yampa River Basin Sediment Monitoring Program <br /> <br />II. Principal Investigator: <br /> <br />Ed Vail <br />U.S. Geological Survey <br />Phone: 970-245-5257 ex 3029 <br />Fax: 970-245-1026 <br />E-mail: jevaill@usgs.gov <br /> <br />III. Project Summary: <br /> <br />The Recovery Program has identified a need to better define the requirements, appropriate <br />methodologies and levels of effort for a sediment monitoring program, to help define <br />habitat requirements for en~ered native fish in the Yampa, Little Snake, and Green <br />Rivers, To meet that need, an independent peer review panel was formed to review <br />historical data, review the status of ongoing data colleCtion efforts, identify sediment <br />issues as they relate to recovery of endangered fishes, and develop recommendations for <br />future sediment work to support Recovery Program efforts. Based upon peer review <br />recommendations, a sediment data collection iniative was undertaken beginning in 1998. <br />During the first year of the study, 25 suspended sediment and bedload samples were <br />collected at the two Yampa River sites and one Green River site between May 6 end June <br />30, 1998. The date has been sent to the USGS laboratory for analysis, when analysis <br />results are received a summary report on the 1998 data collection will be prepared. <br /> <br />IV. Study Schedule: Initial year - 1998, Final year - 2008 <br /> <br />V. Relationship to RIPRAP: <br /> <br />Yampa River Action Plan: Yampa and Little Snake Rivers1.A.4.a(3) <br />Yampa River Operation and Management Plan <br /> <br />VI. Accomplishments: <br /> <br />A total of 25 suspended sediment and bedload samples were collected at the two Yampa <br />River sites ani;l_~e_ Green River site between May 6 and June 30, 1998. Preliminary <br />analysis of existing data for the Yampa River at Deerlodge Park and the Little Snake River <br />near Lily indicates the highest suspended-sediment concentrations occur during early <br />spring flushes associated with low elevation snowmelt. The majority of material collected <br />during these early samples is finer than 0.062mm (fine sands, silts, clays). Suspended <br />sediment concentrations tend to remain high during the rising limb of the spring peak and <br />gradually decrease during the recession. Isolated summer thunderstorms can contribute <br />high suspended-sediment concentrations that have high percentages of material finer than <br />0.062. Higher bedload discharges occur during the rising limb of the spring peak also <br />and during the rising limb of summer storms. Analyses of suspended-sediment <br />concentrations and bei;lload discharge are expected within the next 30 days from the <br />USGS sediment lab. <br /> <br />. ' <br />.~" ~ <br /> <br />."- <br />'., <br />