Wis. Stat. § 87.02: Powers of department.

To accomplish the purposes of ss. 87.01 to 87.17, the department of natural resources is hereby authorized and empowered:

(1) To order the straightening, widening, altering, deepening, changing or the removing of obstructions from the course of any river, watercourse, pond, lake, creek or natural stream, ditch, drain or sewer, and the concentration, diversion or division of the flow of water therein; provided, that in the case of navigable waters no such work shall substantially impair the navigability thereof.

(2) To order the construction and maintenance or the removal of ditches, canals, levees, dikes, dams, sluices, revetments, reservoirs, holding basins, floodways, pumping stations, sewers and siphons, and any other works reasonably adapted or required to accomplish the purposes of said ss. 87.01 to 87.17.