Where is Perkins Lake in region three?

Answer:

To the best of my knowledge there is no Perkins Lake in Region 3. 

This is what we do have for Perkins Lake in our Fishingplanner.  (click the lake name for more info and maps)

Perkins Lake Salmon Region (7) Upper Salmon Basin
Perkons Lake Magic Valley Region (4) South Fork Boise Basin
Perkins Lake Clearwater Region (2) Lower Kootenai Basin