Wisconsin engineering frosh are initially admitted to a first year engineering program and must meet specified GPAs to enter their majors. For chemical engineering, students need a 3.5 GPA in their math and science prerequisites, and a 3.0 GPA overall:
http://www.engr.wisc.edu/cmsdocuments/First-year_GPA_requirements_to_accompany_GCR15.pdf
More information on the Wisconsin first year engineering program:
http://www.engr.wisc.edu/cmsdocuments/GCR15.pdf
Note that Wisconsin students not in the engineering division may face higher standards to switch into an engineering major.