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<br />(;~ <br />';"-"';; <br />\~, <br /> <br />~ <br />,~~:' <br /> <br />. -"', . . /1.._ ~ .....u <br />..,. '=:,.c: ':"O;:;Y <br />,. <br /> <br />, , <br />'.._ '- i <br /> <br />~. - <br /> <br />E ';.,i7: ;---;-- <br />. _._._._~ <br />l.,(. <br />-_3~. 'F, \'A ~}TI <br />3~~;':' <br /> <br />BIOLOGICAL OPINION SUMMARY <br />Spring 1996 Beach/Habitat-Building Flow, Glen Canyon Dam <br /> <br />, <br /> <br />f' <br /> <br />Date of opinion: <br /> <br />February 16, 1996 <br /> <br />U.S. Bureau of Reclamation, Upper Colorado Region, Salt ,.~ ..c;~~'- <br />UT ~...,....... ..' .--. ':)"" <br />Spring 1996 Beach/Habitat-Building Flow, Glen Canyon oain---: .' .~~--~.~ :r <br />[~... """"" foe>. <br />3rt <br /> <br /> <br />Action agency: <br /> <br />Project: <br /> <br />Location: <br /> <br />Coconino County, Arizona <br /> <br />Listed species affected: endangered species: humpback chub (Gila cypha) with critical <br />habitat; Kanab ambersnail (Oxylomtl haydeni kanabensis) without critical habitat; and <br />southwestern willow flycatcher (Empidonax trail/ii extimus) with proposed critical habitat. <br />Biological opinion: Nonjeopardy, nonadverse modification - page 2 and 22 <br /> <br />Reasonable and prudent alternatives (RPAs): None required <br /> <br />Incidental take statement: <br />Anticipated take: Exceeding this level may require reinitiation of formal consultation. <br />Humpback chub. No more than 25 humpback chub are found lIoating dead in the mainstem or if no humpback chub <br />or native fish from 1995 year class are found in nearshore habitats in the mainstem above Unlcar Rapid (RM 73) <br />,fter the test flow. Kanab ambersnail- 17 % of the Kanab ambersnail habitat in Grand Canyon could be talcen or <br />,oout 129m' primary habitat. Southwestern willow flycatchers - Row up to 1.5 m inundating histOric nesting <br />territories before nesting season. <br />Reasonable and prudent measures: Implementation of these measures through the tenns <br />and conditions is mtlndatory. Humpback chub. Conduct test during a period to avoids concentrations of <br />young-of-year humpback chub; follow proposed pancm of stepped down-ramping rates; Use test flow stUdies to <br />develop methods to detect talce. Kanab ambersnail - Before another habitat-building flow. Reclamation will enter into <br />Informal consultation. Southwestern willow lIycatcher. Conduct test flow before April 15. quantify flow depth and <br />velocity at each of above four territories. measure habitat characteristics at four sires and compare with test lIow. <br />conduct surveys and monitoring in 1996. initiate formal consultation by February 1m on preferred altemative. <br />Terms and conditions: Tenns and conditions implement reasonable and prudent <br />measures'and are mandatory requirements. Humpback chub- Monitoring based on study proposal. report <br />results of the monitoring; Kanab ambersnail . Monitoring based on study proposal. establish stage recorder. and <br />relocate individuals to be inundated and monitor moved individuals for I year; Southwestern willow flycatcher - <br />Monitoring of the project area and repo" of the results of the monitoring. <br />Conservation recommendations: Implementation of conservation recommendations is <br />discretionary. Avoid using spillway during test flow; investigate comparable habitats for Kanab ~bersnail; help <br />establish refugium; continue with review of second population; and study success of moving ...egetation. <br /> <br />8iolngii.:.:,d and C{}ut'erencl:: Opinions Glen C.i!nyon Be,jH;h;,Hiihlla[~Buihjin~ Flows 1/16/96 <br />