Many years ago I traveled from Wagosh to Jackfish Lake (long enough ago that the portages were still on the maps). The route was rugged and the trails were faint. We camped at Pakwene on an old designated site that had been destroyed by  what had to be a tornado, pitching tents in a tangle of huge downed white pines. We never found a portage between Maingan and Jackfish- just pushed on through. Jackfish and the unnamed lake towards Wednesday Bay were beautiful.