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The USGS is a great place to check for flows, and another is American Whitewater's Colorado flow page which is linked above under "Flows." Or you could click here
This has more reports than in the standard USGS page.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse