The minimums are what most people call minimum (I've found other people boating it)...my minimums are lower as you may have heard
The upper section starts in Estes and goes to the handicap take out. It is III with 3 IVs. Min = 350 cfs
The Gnar as you know is only 600 yds. Min = 200 cfs
The main section puts in at the end of the gnar and takes out at Drake. It is IV with a IV+. Min = 220 cfs
The Drake section puts in across from the mail store and goes to the Idywild dam. It is II with 2 IV-s or you can run the dam but not over 350ish. Min = 180 cfs
The lower section puts in below the dam and takes out at the park or you can go down to the cherry store dam. It is IV and at higher water could be IV+ due to consequences.
Most people run the main section to the park as one long run.