The north end of the park is located along upper Randolph. There are 2 paths to enter the park without steps and 2 sets of stairs that enter into the park 1 of each is located on both the east and the west entrances of the park. 1 located at the east side of the park off of Randolph and the other on the west side of the park off of Randolph. The stairs will be the first entrance that you will see, the sloped path is the second.
Yes, the pedestrian bridge: https://millenniumparkfoundation.org/art-architecture/bp-bridge/
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