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http://156.42.96.39/alert/Flow/4899.htm
This page references flood control:
http://156.42.96.39/cgi-bin/showrpts_mc?ID=4900%20SP=1h%20NM=72%20T=t
So I think it is called Cave Buttes Dam.
Another reference:
http://il.water.usgs.gov/proj/nvalues/az_webpage.html