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<br />, <br /> <br />just the economic aspects. Also, the entire water supply system <br />and the impacts of dam operational changes on the supply should be <br />monitored. <br /> <br />Pg. 37, C. 1, P. 3. According to W. Minckley, we should expect to <br />lose young humpback chub downstream to Lake Mead with these high <br />flows but this should not hurt the population. We should expect to <br />lose at least the 1992 and 1993 year classes (i.e., fish less than <br />200 mm). Young trout would be washed downstream but stocking would <br />, compensate for these losses. The Service would have to check "yes" <br />for question #8 of the Categorical Exclusion Checklist which asks <br />if a listed species may be affected. Also, the service will be <br />looking for an assessment of net habitat gains and losses. Service <br />consultation may be needed for the proposed high releases. <br /> <br />Pg. 37, C. 2, P. 1. Several drawbacks with the spring/summer <br />season proposed should be explained in the final EIS. These <br />include: <br /> <br />1 <br /> <br />'. <br />., <br /> <br />Humpback chub - Young humpback spawned in April-May do not enter <br />river until about July or August. Young (< 200 mm) from previous <br />years are near shore and susceptible to washout anytime. Also, <br />Young chub losses would increase at this time as they enter the <br />mainstem from LCR. <br /> <br />, <br />i. <br />;", <br /> <br />, <br />; <br /> <br />Other Native fish - Young are along shorelines near tributary <br />mouths in late May and early June and susceptible to washout. <br /> <br />Trout - Young trout are less susceptible to washout after April but <br />basically no detriment to population is expected as stocking could <br />supplement. <br /> <br />Southwestern willow Flvcatcher - Avoid nesting period which begins <br />in April. <br /> <br />Other Riparian birds - Nesting begins in April with probable <br />washout after mid-April. <br /> <br />Tamarisk - Tamarisk seeding and germination begins after mid-April <br />and continues to about December. Also, by doing the experiment <br />early, Tamarisk germination would not be helped by flooding. <br /> <br />,.,.. <br />..~ <br /> <br />~ ". <br /> <br />Monsoon - Summer monsoon precipitation creates uncertainties and <br />would complicate the experiment. <br /> <br />, <br />:r; <br />~ <br />~ <br />( <br /> <br />Recreation - There are larger numbers of summer rafters and anglers <br />possibly affected by flows. <br /> <br />Cost - WAPA's Dave Sabo said this would pull water out of months <br />when it is more valuable and put it in months where it is less. <br />Their estimate of lost generation is $1.2 million for a 31,500 cfs <br />flow experiment for two weeks and $2.1 million for a 45,000 cfs <br /> <br />19 <br />