Gauge Description:

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Minimum boatable flows in this reach are around 300 cfs. Since the Borel Powerhouse diverts about 600 cfs, releases from Isabella Reservoir need to be at least 900 cfs before this section is boatable. The dreamflows.com graph above shows the amount of water remaining in the river after the powerhouse diversion. 
Flow information is provided by the Army Corp of Engineers, at Isabella info

New minimum instream flows are 25 cfs from November through April, 30 cfs in May and October, and 60 cfs from June through September.

 

A USGS schematic map of inflows, diversions, storage and gauges is in this Kern River Basin, pdf file.
Historic flow information is available for the years 1945 to 1993 from USGS gauge #11191000.

The Army Corp has links to historical reservoir information (inflows, outflows, storage, & precipitation, from 1995) at this California Reservoirs page.    You can view either graphs or tabulated data.   The flow in this reach is listed in the second column from the right as Isabella, in the tabulated data.  It is listed as Kern Isabella in the graphs. 

Gauge Information

Name Range Difficulty Updated Level
Kern Above Borel Powerhouse
dream-473 300 - 4000 cfs II-III 01h20m 505 cfs (running)

gauge graph
RangeWater LevelDifficultyComment
300 -4000 cfs barely runnable-high runnable II-III gauge is important or has warning
600 -1500 cfs med runnable-a bit pushy runnable II-III gauge is important or has warning

Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.

When River/Gauge Subject Level Reporter
> 10 years Kern; Isabella dam to Miracle Hot Springs [CA] Keysville view n/a Paul Martzen
> 10 years Kern, Isabella to Sandy Flat [CA] 39653.jpeg n/a Paul Martzen