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<br />Summary Table ofImpacts <br /> <br /> Completely Drained Elevation 3500 Feet <br /> Concept Concept <br />Exposed Glen Canyon Yes Minimally <br />channel <br />Generation capacity impacts Eliminated Reduced by at least 1/3 <br />Lake Powell recreation Eliminated Reduced by 2/3 <br />Reduced evaporation Eliminated Reduced by 2/3 <br />Downstream trout fishery Eliminated Altered, if not eliminated <br />Sediment transport through Sediment bypassed None, same as present <br />Glen Canyon Dam <br />Pre-dam temperatures Same as pre-dam Warmer than at present, but <br />through Grand Canyon not as warm as pre-dam <br />Maximum release from Lake Same as inflow About 45,000 cfs <br />Powell <br />Restriction on upper basin Stopped at current levels Stopped at current levels <br />consumptive use <br />Lower Basin uses Could increase Could increase <br />Surplus/shortage to lower More surpluses, fewer More surpluses, fewer <br />basin shortages shortages <br />Flood control releases from More spills More spills <br />Hoover Dam <br />Glen Canyon recreation Restored Little Change <br />Endangered species Restored No change <br />mitigation potential <br />Grand Canyon white water Greatly reduced during high Increased during spring <br />recreation or low years (release = runoff (45,000 cfs); decreased <br /> inflow) during remainder of year <br /> (release = inflow) <br /> <br />6 <br />