United States, Minnesota, Houston, Upper Mississippi National Wildlife Refuge. Mississippi River Navigation Pool #8. Island 12; Mississippi River mile 690.5; T103N, R4W, Sec. 13. Island on W side o Mississippi River Navigation Pool #8. Island 12; Mississippi River mile 690.5; T103N, R4W, Sec. 13. Island on W side of main channel. N end of the island.. 103N 04W 13