This institution still exists and is now known as Lutheran Counseling & Family Services of Wisconsin (LCFS). They have a website with contact info: http://www.lcfswi.org/index.html
I have not yet contacted them about my grandmother, who was an orphan placed with them in Milwaukee in 1902. Bear in mind that modern privacy laws restrict what information they can give out, even assuming that records still exist from so long ago. Good luck and please let me know how any inquiry turns out.