Laserfiche WebLink
<br />Proposed Water Year 2005-20~6 Experimental Actions <br /> <br />12 <br /> <br />of HBC accomplished to measure changes in the population of the endangered fish as a <br />response to mechanical removal also may have short-term negative effects, As a means <br />to alleviate adverse effects, the 2002 EA also included translocation of HBC above Chute <br />Falls on the Little Colorado River, subsequently documented as a biological opinion <br />conservation measure, <br /> <br />Conclusion <br /> <br />We conclude that the Proposed Action may affect, and is likely to adversely affect, HBC <br />and its critical habitat. Adverse effects are expected to be short-term, and there is a high <br />probability that both HBC and its critical habitat will accrue a long-term benefit from the <br />Proposed Action, <br /> <br />Razorback Sucker <br /> <br />Razorback suckers are very rare in Grand Canyon and some fish biologists speculate <br />that this species was never more than a transient member of the native fish fauna <br />(Minck ley 1991, Douglas and Marsh 1998), There is also a population of approximately <br />500 individuals that exist in Lake Mead, This population has been studied since 1996 <br />(Holden et al. 2000), but no data exist to determine whether this population moves into <br />Lower Grand Canyon, Under both the No Action and Proposed Action alternatives, <br />razorback sucker is expected to remain very rare in Grand Canyon, Little to no <br />successful reproduction or recruitment is expected to occur, <br /> <br />Conclusion <br /> <br />We conclude that the Proposed Action may affect, but is not likely to adversely affect, <br />RBS or its critical habitat. <br /> <br />Southwestern Willow Flycatcher (SWWF) <br /> <br />Alternating Low Steady and Low Fluctuating Flows <br /> <br />No effects of these flows are anticipated on SWWF, <br /> <br />High Experimental Flow <br /> <br />SWWF is a neotropical bird that utilizes habitat along the Colorado River from May <br />through August or September and winters in parts of Mexico to Panama, During the <br />period of the high experimental flow under either the No Action or Proposed Action, <br />there would be no SWWF present. The high experimental flow would inundate the <br />ground area associated with known SWWF sites as well as other potential habitat, and <br />would result in the reduction of ground cover and possibly low lying branches that <br />