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. . BEAR CREEK DAM AND LAKE (Contd) In response to the contracts for temporary water storage B revised Memorand~ of Understanding (MOU) between the Corps of Engineers and the State of Colorado ~c' signed on June 20, 1988, This memorandum supersedes the previous MOU dated May 11' 1977, Under normal conditions the Bear Creek Dam outlet works is set -, automatically pass streamflow up to 500 cfs when pool elevations are above the dr~: inlet-outlet weir crest of 5558 feet HSL, \/hen conditions warrant, higher release; are made by opening two slide service gates in the dome type gated control structur, buried under the embankment, Under the revised MOU, the State Engineer or hi, representative will determine the storage and releases necessary to satisi': downstream water right requirements when the pool level is below elevation 5559 f~ MSL, Elevation 5559 is one foot into the flood storage zone and was selected to allow flexibility in targeting authorized pool levels, During the report in, period, no requests were received to change to continuous gated regulat.lon to stor~ water per the contracts. ..J . en ~ ..... W W ...... T~ prevent short circuiting of the inflow in the lake and improve waCe: qu~lity, the mid-level gate was open on May 25, 1988 and set to discharge 15 cfs, Attempts to open the gate earlier in the season were thwarted by the unstable ie, conditions which restrict access to the tower. The mid-level gate discharge ~a~ reduced to approximately 2 cfs on July 5 and closed on July 7, A rapid recessioc of the streamflow at Morrison caused the elevation at Bear Creek to drop below 555f from July 2 through July 6, Releases to Pioneer Union were curtailed for part 0: this period to permit Bear Creek to return to a non-gated operation, . Z o ..... oe{ > W -l W Runoff during the reporting period was 83 percent of the historical average, During the December through April period, runoff averaged 153 percent above normal, The maximum pool achieved during the period was 5560,51 on Kay 19, A total of 28, AF or about 1 percent of the 28, 757 AF flood storage zone was utilized, The peal: daily inflow was 335 cfs on May 20, The maximum daily discharge was 344 cfs, alsc on May 20, No flood control was achieved during this period, Maximum of Record: Pool-Date Dailv Inflow-Date Dailv Outflow-Date 910 cfs May 1 80 800 cfs Hay 5-12 80 690 cfs Jun 10 79 800 cfs Jun 12 79 625 cfs May 23 83 605 cfs Jun 29- Ju1 2 83 Highest 2nd 3rd 5581.0 Jun 23 83 5576,3 May 19 80 5567,9 Jun 10 79 Pool-Date the resF Augu Minimums of Record (since initial fill): Lowest 2nd 5556,98 Feb 9 82 5557,08 Ju1 9 86 BOWIT cons draw IX G \