Minn. Stat. § 89.26

All water powers having a possible average development of 100 horsepower or more owned by or subject to the control of the state and all lands so owned, controlled, or held in trust by the state lying within one mile of such water powers are hereby withdrawn from sale and held for the purpose of the improvement and utilization of the same for the purpose of having paper manufactured by plants built at and using the power of such water powers.