Here's a link to the USGS data collected in the area. It shows the discharge rate jumping from 80-100 cubic feet per second to >30,000 cubic feet per second.

I had to go back and re-read the numbers. The 87 year average flow for the Colorado River at Grand Canyon (for this week) is in the 20,000-25,000 cubic feet per second range. The Colorado (through the Grand Canyon) can go a couple of years without seeing 30k cfs.

http://waterdata.usgs.gov/nwis/uv?cb_000...ite_no=07359610

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