The Army Corp does not manage the lake. It is fully managed by the city of Tempe and they used ground water to originally fill it. The city is responsible for all lake associated costs. The Army Corp has jurisdiction though and that is why when there are large releases from the reservoirs to the north, the dam walls are dropped and water flows freely through there. Also, any development within the channelized portions of the wall are under the jurisdiction of the Army Corp. I don't pretend to know all the details of the arrangement.
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