Hetch Hetchy Water and Power originally published a schedule for most of May, 2009, but changing circumstances (and time) render most of it now obsolete.  So, in an effort to avoid confusion, all the old passages have been deleted, in favor of this new one:

"Hello River Recreationists -

Per the spread sheets you have been receiving (last one on Monday the 18th), we have been releasing large amounts of water from both Hetch Hetchy and Cherry to accomplish research goals and to make room to hold inflow during the Friday - Monday holiday period that starts tomorrow.

Releases at HH have been ramping down since noon, and as of 6 pm today we will be releasing 2000 cfs for the rest of the weekend.  Releases at Cherry have been ramping down since 2 pm, and as of 4 pm we will be releasing 25 cfs.  Eleanor has decreased from 760 cfs to 400 cfs due to operational changes.  Holm PH is releasing 975 cfs into Cherry Creek, and Middle and South Forks of the Tuolumne are about 500 cfs combined.  Small inflows along the channel add 300 cfs or so more, so expect to see about 4500 cfs at Meral's Pool by Friday morning, 22 May.  That value will hold steady or decrease gradually during the 4-day period due to fairly stable temperatures.

Starting Tuesday the 26th and through Thursday the 28th, flows may increase again to the 6500 cfs range at Meral's Pool depending on inflow rates and possible spill-control releases at Cherry and Hetch Hetchy.

I will communicate again on Tuesday the 26th, and of course immediately if conditions change and the flow at Meral's pool is going to exceed the forecast by 300-500 cfs.  Please recreate safely during the weekend and take all whitewater precautions."

I've updated the table below to reflect the updated estimates through this weekend, but from Tuesday onward have left the estimated flows the way they were.  The above section comments on what next week may hold.

Key to table: