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<br />, , <br /> <br />. <br /> <br />. <br /> <br />, . <br /> <br />A gated check structure will be provided in the existing Riverside <br />Canal to prevent the canal from operating as a spillway. Occasional <br />encroachment of Narrows Reservoir (at higher water surface elevations) <br />on the existing Jackson Oam, Bijou Reservoir No.2, and the banks of <br />the Riverside Canal will not affect the safety of Narrows Dam, but <br />could cause damage to these adjacent reservoir and canal facilities. <br /> <br />For purposes of comparison, the following tabulation shows a <br />summary of dam and spillway physical requirements for the 1973 DPR plan <br />and for the current plan. <br /> <br />Summary'of physical requirements <br /> <br />1973 DPR <br /> <br />Current plan <br /> <br />'Dam and Reservoir (feet) <br /> <br />Maximum water surface 4447 4448.5 <br />Crest elevation 4453 4454 <br />Height, dam 146 147 <br />Length, dam 22,120 22,400 <br />Crest width, dam 30 30 <br />Sl urry trench none yes <br />Spillway length (feet) <br />Service 100 un ga ted 50 gated <br />Auxil i ary none 750 <br />Spillway design capacity (ft3/s) <br />Servi ce 27,600 78,660 <br />Auxi 1 i ary none 155,830 <br /> <br />Relocations <br /> <br />Plans for the relocation of the Union Pacific Railroad and county <br />and State highway systems have been under negotiation with the interested <br />parties. Suggested changes brought about by revised design criteria, <br />environ~enta1 and economic considerations, and recommendations from <br />cooperating agencies hdve been under consideration. The area map <br />(exhibit 1) shows the proposed relocated routes. <br /> <br />5 <br />