Gauge Description:

The flow graph displayed below is from the Southern CA Edison gauge for San Joaquin River Above Shakeflat Creek  which is a short ways below Mammoth Pool dam. Click on the "Show List" button and you will see flows in several other river sections in the basin, as well as reservoir surface elevations.
SCE Hydro   Provides additional information about the Big Creek Project.

Edison Big Creek Office phone has been changed  In the past, if the online gauges were down, you could report that problem here and the secretary would usually find out the flow for you.

Mammoth Pool Surface Elevation shows how close the reservoir is to spilling at about 3,330 feet.    
The Millerton DailyReport - pdf shows reservoir storage as of midnight, including percent of capacity, for Mammoth Pool and for other reservoirs in the basin. Mammoth can only spill when it is full, as there are no gates on the dam or spillway.

Flows of 700-800 cfs are low but okay.  Flows around 1,000 to 1,500 cfs is considered optimal by many.

Historical flow data related to this reach can be found at these sites:
San Joaquin above Shakeflat: USGS
Mammoth Pool PowerPlant
San Joaquin above Big Creek, has data from before the construction of Mammoth Pool dam.
USGS gauge list for historical records of all gauges past and present in the upper San Joaquin drainage.
USGS pdf schematic of the dams, diversions and gauges is helpful for understanding the plumbing system in this basin.