I caught a few brook trout off Port Washington,but that was in 1980's-90's.Hope they stock them again.

manitowoc and milwaukee rivers got brookies

none for sheboygan not sure about other tribs

you can look up all fish stocking data for WI on dnr website

I caught one back then too (80's). It was not a splake, like my friend caught ice fishing in Bay de Noc. I fish Kewaunee and caught a whitefish on a flutterspoon trolling for kings once too. I fished for coasters (shore oriented brookies that are native to the cold waters) by walking a miles long beach on Lake Superior, dragging a planer board 'till it got out a ways from shore. Nothing bit the small spoon I tried.

this winter I caught a fingerling brook trout in the same tributary I also caught a fingerling steelhead. It was a beautiful fish.

In the late 80's I caught a few brook trout like fish in the Milwaukee harbor.   I thought the fish were Splake.  A cross between brook trout and lake trout.  

Caught 1 this winter. Around 12” long. Pretty Fish! Still swimming.

During 80s and early 90..Kenosha harbor had a population..some nice size too

Actually you cld see them. Rising to flies early mornings 

Some guys Actually tried for them wth fly tackle and wre successful 

There were Brookies in Lake Michigan waters in the mid 80s.  An ex girlfriend caught one while we were fishing the Sturgeon Bay canal.  I also remember seeing them caught in the Oconto harbor around the same time frame.  Also saw them caught at the Kewaunee Nuclear Plant outflow - when we could still fish there. 

The DNR stocked brookies in lake michigan this past fall

Did you call the Milwaukee DNR office?

Edit: 414-263-8500