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<br />'. <br /> <br />2 <br /> <br />Long Draw Dam and Reservoir Data. <br /> <br />Item <br /> <br />Elevation <br />(feet) <br /> <br />Capacity Surface Area <br />(acre-feet) (acres) <br /> <br />Top of Irrigation Pool <br /> <br />10,103.7 <br /> <br />11 , 000 <br /> <br />340 <br /> <br />Average Pool (during recreation season)* 10,090 <br /> <br />6,750 <br /> <br />282 <br /> <br />Minimum Pool <br /> <br />10,059 <br /> <br />600 <br /> <br />84 <br /> <br />Maximum draw down 44.7 feet, 10,400 acre-feet. <br /> <br />*Based on typical fill and draw down schedule. <br /> <br />By analysis of a typical operating plan of the reservoir furnished by the <br />consulting engineer for the project, the average surface acreage during <br />the recreation season was estimated to be 282 acres, A summary of this <br />calculation follows: <br /> <br /> Average Water Surface Elevation for Period Surface Area <br />June 15 - June 30 10,098.0 feet 315 acres <br />July 1 - July 31 10,103.7 feet 340 acres <br />Aug. 1 - Aug. 31 10,084.0 feet 275 acres <br />Sept.l - Sept. 15 10,068.0 feet 155 acres <br />Weighted Average Reservoir Size for the recreation season June 15 through <br />September 15 is: 282 acres. <br /> <br />The major disadvantage to the reservoir is the fluctuating water surface, <br />A long boat ramp is necessary to permit launching at all water levels,and <br />"mud flats" will interfere somewhat with shoreline access. The outlet <br />gates will usually be closed from. November to July. It is anticipated that <br />seepage from the dam will equal or exceed the natural winter inflow to the <br />reservoir, thereby providing for fish survival in the downstream channel to <br />the point where other tributary drainages will augment the flow, The remote <br />location precludes winter outlet-gate manipulation which would ordinarily be <br />required to support downstream fish habitat by release of the small natural <br />winter inflow. Furthermore, winter storage in the reservoir will improve <br />fishery conditions in the permanent pool. For these reasons, fishery <br />releases are not recommended. <br />