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<br />tt 00l~19 tt <br />~~o_..s~ <br /> <br />INTRODUCTION <br /> <br />One goal of the S an Juan River Basin Recovery Implementation Program (SJRIP) is to <br />conserve popula1tlons of Colorado pikeminnow (Ptychocheilus Lucius) and razorback <br />sucker (Xyrauchen texanus) consistent with the recovery goals established under the <br />Endangered Spec:ies Act, 16 U. S. C. 1531 et seq. Since i~ti.ation in 1992, the s~ <br />has conducted extensive physical and biological research and monitoring within the 18 <br />~ver 1!I!!i!t& segnulllt from the mouth of the AnimR.C: River at Farmington, NM downstream to <br />Lake Powell. Based upon these findings, management actions including non-native fish <br />~~tocking, passage enhancement, and instream flow recommendations have been <br />~ ~d~~;l~-;~.d and implemented. Numerous program reports have been generated to document <br />~ un..... these activities (e.g. Holden (ed.), 1999; Propst et al, 2000; Holden. 2000; and Golden and <br />~ . Holden, 2003). These and many other documents are available from the SJRIP website at <br />:!Ltq>:/ Isoutbwest fws. gov/sjrip-"- <br /> <br />The SJRIP is currently conducting a major program review. Begun in 2002, the review <br />process has been slowed due primarily to funding delays, but is now on track to be <br />completed by e:~r1y 2004. The purpose of the review is to 1) compile, integrate and analyze <br />the monitoring data collected from 1998 to 2002, 2) evaluate the effecj;i:feness of the <br />program's monitoring plan and management actions, and 3) under the ffogram's adaptive <br />management process, adjust the monitoring and management as necessary. Foremost <br />among the actions being reviewed are the flow recommendations, the fIrSt such recovery <br />activity deve1o]Jed and implemented by the~gram (Holden (00.), 1999)- <br />D~ <br />The foundatiolt of the SJRlP's flow recommendation process~ mimic!y of the ~ <br />natural hydrogr.aph (HolJi~ (ed.). 1999). ~~~logica1 thought "Wr-J~ ~ii". that <br />maintenance of historiC1iY~ogic variability is essential in conserving native riverine <br />biota and ecosystem inte' . et al. 1996' 1 ., ; <br />1996' and P The further the hydrologic regime deviates from the histori~ <br />condition in terms of stream fl w agnitud ue c , duration,' . , and variability, <br />the greater the pro as upon nceptA <br />e has attempted to restore a more natural hydrograph to the San Juan River by <br />mimicking the variability in flow that e2dsted prior to major human intervention, thereby ~ <br />~ providmS-h@p!~ improved conditions to restore ecosystem health and contribute to II c:::s <br />endangered species recovery. Linkages between hydrology, geomorphology, habitat and <br />biology have been explored and the relationships used to help define mimicry for..tk(nmoff <br />and base flow :periods. The flow characteristics of these linkages were then compared with <br />the statistics of ~ pre-Navajo Dam hydrology to assist in fine-tuning the <br /> <br /> <br /> <br />1 <br /> <br />E09-~ BlO/VOO"d 991-1 <br /> <br />-WOJ~ wd91: 10 EO-BO-l~O <br />