Hey Jack, welcome to the forum.
Hopefully some Badgers will weigh in with some good advice.
I haven't fished much in Northern Wisconsin except for a few days on the Brule for steelhead (feeds into Lake Superior in northern WI), but it also has lake run browns and salmon in the fall as well as resident trout. In addition to a lot of small streams loaded with brook trout, there are some other well known Northern WI trout water including the Peshtigo (in Forest and Marinette counties) and Wolf (in Langlade county), Namekegan (Bayfield and sawyer county)
Here's a link to the WI DNR's webpage Places to Fish in Wisconsin - FAQ - WDNR
From that page there's a link to:
info on fishing the Bois Brule
WI Trout Streams Maps and Classes which will tajke you to detailed maps by county
Washburn County Trout Fishing- a link to maps and GPS coordinates for trout ponds in the Washburn County Forest
And don't overlook the GL tribs for spring/fall runs of steelhead and fall runs of big lake run brown trout and salmon.
There are also streams that feed in Superior that have "coasters" (a lake run strain of brook trout) Coaster Brook Trout
Here's another link that might also help with names and maps of more trout streams and a directory of WI fly shops:
Wisconsin Fly Fishing :: Wisconsin Trout Fishing, Wisconsin Trout Streams Locations and Wisconsin Fly Shops
Good luck and again welcome to the forum. Let us know how you make out on your expeditions!