Wis. Admin. Code Department of Natural Resources NR 21.03
All residents of Wisconsin and Minnesota holding a resident fishing license from their respective states or residents other than Wisconsin and Minnesota holding an angling or sport fishing license issued by either state, may fish in any of the waters of the Mississippi river lying between the Burlington Northern and Santa Fe railroad tracks on the Wisconsin side of the river and the Chicago, Milwaukee, St. Paul and Pacific railroad tracks on the Minnesota side of the river, including all sloughs and backwaters, bays and newly-extended water areas connected with the main channel of the Mississippi river by a channel which is navigable at periods when the water is approximately equal to normal pool elevation as created by the U.S. department of the army, and in the waters of Lake St. Croix, and the St. Croix river and the St. Louis river as defined in s. NR 21.02(39). This reciprocity applies only to sport fishing, spearing, dip netting, and the taking of minnows and crayfish for such fishing.
Wis. Admin. Code Department of Natural Resources NR 21.03