Gauge Description:

During spring spill season, the Cresta gauge is a good indicator of what will be flowing in the Poe reach. Add about 10% to the Cresta gauge reading.   

PG&E is now providing flow information for this reach (as of Nov. 10, 2009). 

Historical flow records for this reach are available online from USGS.   PG&E maintains several gauges.
Gauge #11404400 only records low flows up to 137 cfs for the minimum releases. 
Gauge #11404500 records spill flows and such that are of interest to boaters. 
Year 2007 records pdf

REMARKS.--Flow regulated by Lake Almanor, Bucks Lake, Butt Valley Reservoir (stations 11399000, 11403500, and 11401050, respectively), Mountain Meadows Reservoir, and five forebays, combined capacity, 1,386,000 acre-ft. Diversion through Poe Powerplant began on May 29, 1958. See schematic diagram of North Fork Feather River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 105,400 ft³/s, Jan. 1, 1997, gage height, 41.65 ft, from rating curve extended above 32,000 ft³/s, on basis of slope area measurement of peak discharge; minimum daily, 5.4 ft³/s, Sept. 18, 1977.

Gauge #11404900 records flows through the Poe powerhouse which gives some indication of what flows could be during powerhouse or dam maintanence periods if flows go into the river.

NF Feather Schematic pdf