This gauge is located on the Middle Fork Feather at Milsap Bar which is the take-out for this run. It also includes flows from the Little North Fork of the Middle Fork Feather who's confluence is at Milsap.
Early season flows will have significant input from side creeks downstream of putin, thus 1000cfs in March may make for a very boney first day but 1000cfs in June a quite reasonable first day. Some clue might be obtained from this gauge way upstream of putin near
Flow information is also available from dreamflows.com