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<br />. . <br /> <br />2 <br /> <br />f. <br />V . <br />\,,".; <br /> <br />flow to this section of the Yampa River are Morrison Creek, Service Creek and Green Creek; these <br />tributaries are all fairly minor and do not contribute significant flow to the Yampa outside of the snow <br />melt runoff period. The attached table summarizes the data, the modeling accuracy ranges, and the flows <br />that meet the R2CROSS hydraulic criteria. <br /> <br />. <br /> <br />We have also reviewed the Stagecoach Project Instream Flow Physical Habitat Study completion report <br />by W. J. Miller and Associates (copy attached). In this report, Miller recommends flows ranging from <br />40 cfs to 75 cfs for the months of June through March; for April and May Miller recommended flows <br />between 40 cfs and 125 c!s. Miller's recomme11dations are based upon three study sites on the Yampa <br />River utilizing the IFIM/PHABSIM methodology. The fish species that were used in the habitat <br />simulations were brown trout and rainbow trout. The R2CROSS flow recommendations are, as illustrated <br />by the attached summary table and flow recommendations (below). very consistent with the work <br />performed by Miller. .. <br /> <br />Based on our review of all of the data, the Division of Wildlife's R2CROSS-based flow recommendations <br />for the Yampa River are as follows: <br /> <br />Yampa River <br />Stagecoach Dam outlet to the Lake Catamount high water line <br />Winter Low Flow Season: 47.5 cfs <br />Summer High Flow Season: 72.5 cfs <br /> <br />I <br /> <br />To provide adequate protection to the Yampa River's fishery, we recommend that the low flow season <br />be September through March and the high flow season should be April through August. . <br /> <br />If you have questions regarding these flow recommendations, please call me at 303-291-7260. <br /> <br /> <br />\ <br /> <br />Jay <br />PS IS III - Instream Flow Program Coordinator <br />Colorado Division of Wildlife <br /> <br />Attachments <br /> <br />. <br />