The last report I read on Moose River north was that the first little bit was very low with more walking than paddling.
I have been to Agnes twice, both in August. October should be good for northern and lakers. Agnes has some nice weedbeds at the entrance from the south, and some nice weedbeds at the north end. There are some underwater humps in the northern section. You can see them very easily. Oyster Lake to the west has lakers, but it’s a long portage. Lac La Croix has lakers and the two portages are easier. Just watch out for the wind or you may have problems getting back to Agnes. Boulder River gets very little traffic and I saw a lot of reeds. However the portage from Agnes is longer and muddy on the Boulder River side. If I ever go that route again, I think I would have to hit that area for northern pike.
The walleye on Agnes can be had with rattletraps and Blakemore spinner jigheads.
Alan