This is a link to some of my early journals of travel in WCPP.
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Newer info is in my YouTube videos.

Haven has been impacted by several fires but Irvine was barely touched. Irvine is an interesting lake and is where you want to go. Walleye are especially numerous as are 40+ inch Northern. The shape of the lake allows fishing somewhere out of the wind. Be sure and check out the ",slot portage" Jimbo  mentioned. Exiting
north it is on the opposite side from the official portage on the park map. Since Jimbo's bushwhack the park has opened the proper portages and they are in good shape. They are marked on the new Christmar park map. Several nice camps but look for the one near the gap between the two sections of the lake.