Wis. Stat. § 70.24

The secretary of state shall annually, before January 1, make and transmit to the county clerk of each county an abstract containing a correct and full statement and description of all public lands sold and not patented by the state, and of all lands mortgaged to the state lying in the county; and immediately on receipt thereof the county clerk shall make and transmit to the county assessor and to the clerk of each town, village or city in the county not under the assessment jurisdiction of the county assessor a list from said abstract of such lands lying in such town, village or city. Every assessor shall enter on the assessment roll, in a separate column, under distinct headings, a list of all such public and mortgaged lands, and the same shall be assessed and taxed in the same manner as other lands, without regard to any balance of purchase money or loans remaining unpaid on the same.