From your link:
...crews are working to get transmission lines running from the plant reattached to the powergrid...
...the powerplant when fully operational can release about 14,000 cubic feet per second...
... the lake level rose about two feet over night to 840 feet, or 61 feet below the top...
...officials said they’ll open the spillway up again before the lake rises to above 860 feet...
...heavy equipment operators will work round the clock the next few days attacking the debris pile...
I just don’t see until they actually repair the Main Spillway (looks a YUGE project) how they keep from filling up the river again with more debris when they have to use the spillway again.
A few more pictures have been added. The first one lends some scale to the size of the bottom of the spillway chute.