Here's a tool that you get for your tax dollars. This is a table of the average flows on R-HT. On average it doesn't hit 5K until mid April. If you boat a lot this is a nice thing to be able to use. There are lots of ways you can get the data - graphs, tables, annual stats or just the flow for the past week.
USGS 09163500 COLORADO RIVER NEAR COLORADO-UTAH STATE LINE
Here's another nice little tool you get as well:
COLORADO - CO-UT STATE LINE Forecast
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