The following contains the current and historical admission stats by residency status (page three or so):
https://apir.wisc.edu/admissions/New_Freshmen_Applicants.pdf
OOS is easier than it used to be because the Regents lifted the limit as of last admission cycle and the current admission rate of just over 50% (domestic OOS) reflects that change. International admit rate remains the most selective due, in part, to increasing popularity of UW-Madison among international students.
For a WI resident it’s very easy to be admitted (around a 2/3 admit rate). However, do keep in mind that the average ACT for WI enrollees is around 28 (vs. a 22 for the average WI tester) so the high schools there seem to do a good job at guiding the right kids to UW-Madison. According to their institutional analysis documents, they really want the highest scoring WI residents (30+) to enroll so you are probably fine with a 30 and if you improved upon that score with the Sept. ACT that would only seal the deal in terms of getting admitted. Hopefully you got the math and science scores up a bit.
https://apir.wisc.edu/admissions/Admission_of_High_Scoring_Wisconsin_ACT_Testers.pdf
The average GPA is 3.85 and 76% have GPA’s of 3.75 or higher (per the CDS 2016 C.11-12). You are in that range and especially given the ACT you should be in good shape.
https://apir.wisc.edu/publisherssurvey/CDS_2015-2016.pdf
Good luck to you!