The first descent team felt that 500 cfs was a good flow for the steepest sections of the run and was an adequate flow for all of the run.
Flows are a combination of flow in the S.F. San Joaquin River Blw Hooper Crk ( below Florence Reservoir) and Mono Creek below Mono diversion (unreported as of 2008). Mono Creek Below Lake T. A. Edison Ca, above the diversion is reported. The diversion has an approximate capacity of 400 cfs. Flows from unregulated and unmonitored side streams will be significant in the spring and early summer.
Southern California Edison monitors flows in the SF San Joaquin and in Mono Creek and has promised to make flow information publicly available. See the SCE River Flow and Reservoir Levels page.
Edison also calculates the daily average inflow to Mammoth Pool from midnight to midnight, but so far they have been unwilling to make that information publicly available, for current dates when it would help with trip planning. However, AW can usually obtain this information for past dates for study purposes or for confirming flow estimates. If you wish to know the 24 hour average inflow to Mammoth Pool for specific past dates, please leave a comment or contact the stream team person. We will forward the request on to the appropriate contacts at SCE.
The Millerton DailyReport - pdf shows reservoir storage as of midnight, including percent of capacity, for all of the reservoirs in the basin.
Historical flow information for this reach is available at USGS.
11230215 SF SAN JOAQUIN R BL HOOPER C NR FLORENCE LAKE CA
11230540 SF SAN JOAQUIN R A MONO HOT SPRINGS CA
11231600 MONO C BL DIV DAM NR MONO HOT SPRINGS CA
11232000 SF SAN JOAQUIN R NR HOFFMAN MDW CA
USGS gauge list for historical records of all gauges past and present in the upper San Joaquin drainage.
Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.