Laserfiche WebLink
<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />o <br />.... <br />'-J <br />-..J <br />c;o <br /> <br />MINIMUM REQUIRED RESERVOIR RELEASES <br /> <br />Minimum releases are required from some system facilities to satisfy <br />prior water rights and fish and wildlife requirements. <br /> <br />Releases from Lake Granby to satisfy fish requirements were established <br />by the Secretary of the Interior on January 19, 1961. A release from <br />Lake Granby of 20 ft3/s is required from October through April of each <br />year. During the remaining months of the year, the control point is <br />almost 3 miles downstream from the dam at the YMCA gaging station. <br />A lthough the seepage from Granby Dam and some inflow from tributaries <br />enter this section of stream, there are also diversions for several <br />irrigation ditches between Granby Dam and the control point. <br /> <br />Except in years of subnormal inflow, a flow of 75 ft3/s during the <br />May-July period, 4u ft3/s during August, and 20 ft3/s during September <br />is required at this point downstream of Lake Granby. The flow during <br />the May-September period can be reduced if forecasts indicate the <br />inflow during the water year to Shadow Mountain Lake, Grand Lake, and <br />Lake Granby (less the decreed rights in the reach of the Colorado River <br />between Granby Dam and the mouth of the Fraser River) and the water <br />capaDle of being pumped from Willow Creek Reservoir in that year is <br />230,000 acre-feet 01" less. <br /> <br />The following reduction of fishery flow below Lake Granby will apply on <br />the basis of a forecast to be made by Reclamation during the last week <br />in April, using information from all available sources. <br /> <br />Forecast Inflow <br />in Acre-Feet <br /> <br />Percentage Reduction <br />in Minimum Release <br /> <br />220,000 - 230,UOO <br />210,000 - 220,000 <br />195,000 - 210,000 <br />Less than 195,000 <br /> <br />15 <br />20 <br />25 <br />30 <br /> <br />Adjustments wi 11 be made in the reductions, when appropriate, based on <br />revised forecasts and consideration of actual flows during May, June, <br />and July. <br /> <br />Wi 11 ow Creek below wi 11 ow Creek Keservoir is not considered a fishery <br />resource since an irrigation ditch a short distance below the dam <br />generally uses the entire flow in the late surrmer months. In the <br />Secretarial determination, no releases were provided to maintain <br />Willow Creek as a live stream. However, a release or 7 ft3/s or inflow <br />(whichever is the lesser) from Willow Creek Reservoir is required <br />during the October-April period to augment fishery flows in the <br />Colorado River. <br /> <br />A minimum release of 35 ft3/s for September and October, 45 ft3/s from <br />November through December, 20 ft3/s from January through May, 50 ft3/s <br />in June and July, and 40 ft3/s in August or inflow (whichever is the <br />lesserl is made from Shadow Mountain Lake to maintain fish and wildlife <br />in the Colorado River above Lake Granby. <br /> <br />25 <br />