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<br />o <br />~~ <br />c.., <br />~, <br />1< <br />o <br /> <br />6. Various life history stages of the native fish species may be <br />adversely affected by water quality impacts of the San Juan River. <br /> <br />7. Historic flow conditions (discharge volume, timing, duration, water <br />quality, and habitat availability) in the San Juan River were good for <br />native fish including the rare and endangered fish species. <br /> <br />8. Re-operation of Navajo Dam and Reservoir to mimic a natural historic <br />hydrograph will be physically and biologically beneficial. <br /> <br />9. A natural hydrograph with large spring peaks, a gradually <br />declining/descending limb into early summer, and low stable flows <br />through summer, fall and winter may be the best flow/habitat conditions <br />for rare and endangered fishes in the San Juan River while maintaining <br />the geomorphology of the River channel. <br /> <br />10. High spring peaks are detrimental to non-native fishes and may aid <br />in reducing competition with native species. <br /> <br />11. High spring peaks with a gradually descending limb may be <br />necessary for the formation and maintenance of important nursery <br />habitats in the San Juan River. <br /> <br />12. Re-operation of Navajo Dam and Reservoir for native species can be <br />accomplished without negative impacts on the tailwater salmonid <br />populations and fishery. <br /> <br />These hypotheses and assumptions will be tested in the San Juan Basin Recovery <br />Implementation Program. <br /> <br />1.3 RECOVERY ELEMENTS <br /> <br />The Recovery Program includes six elements: <br /> <br />1. Identification and protection of instream flows. <br /> <br />4 <br />