Gauge Description:

Flow in Horseshoe Bend is a combination of spill from Reddinger, now posted by Edison as   San Joaquin River Above Willow Creek-Spill and the flow in Willow Creek.   Willow Creek often contributes 100 cfs or so early in the season,  but decreases to almost nothing by summertime. Willow can contributes huge amounts during some big winter rainstorms. Click on the "Show List" button and you can see flows for some other river reaches in the basin as well as reservoir elevations. See also Dreamflows for this flow and many other rivers.

There is a staff gauge behind a rock at the downstream side of the mouth of Willow Creek. The staff measures increments of 500 cfs, up to 5000 cfs.

Horseshoe Bend will occasionally have flows in the winter and early in the Spring from low elevation runoff. It will also receive any spill from Mammoth Pool, which usually occurs if the Snow pack in the basin is 100%. The probability increases as the snow pack rises above 100%. Depending on weather patterns, spill can sometimes occur with less snow pack.

If the SCE links above do not work go to:

http://www.sce.com/PowerandEnvironment/PowerGeneration/BigCreekHydro/

to see if you can track down the correct pages.   Seems like the url of the actual data has been changed quite a bit recently.