My knowledge on this subject.. from my 1995 records.. they wouldn't open the auxiliary gates unless the lake reached 949.
Which means.. the dam itself would already be ready to be compromised.
This is a link to the 1995 proposal (updated 2010?).. where at that time the price was negotiated from 55mil to 75mil when it was all said and done : http://www.swl.usace.army.mil/projmgt/trspillway.html
( be sure to back click or might click out of OzarkAnglers, but read it and get a kick out of the outdated logic and info )
If I remember right, the 10 TR gates are capable of dishing out 650,000cfs after being fully opened.
I do wonder sometimes why they call it " flood control " in situations like this.
Those 100yr, 500yr, 1,000yr flood instances are just propaganda. The aux spill is there if Beaver ever lost its grip.. totally and completely, and we (TR Lake and TR Dam) would have to hold an alarming amount of water in a very short time. That's the explanation I got 7 years ago.
Some think this is false info.. you be the judge.
Brian