Here is a compilation of various legal documents and permits relating to line 5 in Michigan. For a general overview of some legal work being done in Michigan, check out this factsheet from FLOW Water Advocates.
Grand Traverse Band of Ottowa and Chippewa Indians Summary of Line 5 Straits of Mackinac:
GLIFWC Cumulative Impacts of Pipeline Construction in the 1836, 1837, 1842, and 1854 Ceded Territories: