(1g) DEFINITIONS. In this section: (a) “High hazard dam” means a large dam the failure of which would probably cause loss of human life. (b) “Low hazard dam” means a large dam the failure of which would probably not cause significant property damage or loss of human life. (c) “Significant hazard dam” means a large dam the failure of which would probably cause significant property damage but would probably not cause loss of human life. (1m) DETERMINATION OF DAM SIZE. For the purposes of this section, a dam is considered to be a large dam if either of the following applies: (a) It has a structural height of 25 feet or more and impounds more than 15 acre-feet of water. (b) It has a structural height of more than 6 feet and impounds 50 acre-feet or more of water. (2) LARGE DAM INSPECTION. (a) Inspection by the department. At least once every 10 years the department shall conduct a detailed inspection of each high hazard dam and each significant hazard dam. (ag) Owner responsibility. 1. Owners of each high hazard dam, each significant hazard dam, and each low hazard dam shall engage a professional engineer registered under s. 443.04 to inspect the dam as specified in this paragraph. 2. An owner of a high hazard dam shall cause the dam to be inspected at least 4 times between each inspection conducted by the department under par. (a). An owner of a significant hazard dam shall cause the dam to be inspected at least 2 times between each inspection conducted by the department under par. (a). An owner of a low hazard dam shall cause the dam to be inspected at least once every 10 years. 3. The owner of a dam required to be inspected under this paragraph shall submit to the department, no later than 90 days after the date of the inspection, a report of the results of the inspection. The report shall include information on any deficiencies in the dam, recommendations for addressing those deficiencies, and recommendations on improving the safety and structural integrity of the dam. (ar) Dam classification. The department shall classify each dam in this state as a high hazard, significant hazard, or low hazard dam for the purpose of this section. (b) Exemption for federally inspected dams. Notwithstanding the inspection requirements under pars. (a) and (ag), an inspection under par. (a) or (ag) is not required if the dam is inspected periodically by or under the supervision of a federal agency in a manner which is acceptable to the department and if the results of each inspection are made available to the department. (3) INSPECTION UPON COMPLAINT. If the department receives a complaint in writing from the mayor of a city, supervisor of a town or the president or trustee of a village which alleges that a dam maintained or operated in or across any navigable or nonnavigable waters or a reservoir is in an unsafe condition or if the department receives a complaint in writing from a person which alleges that the person’s property or any property under the person’s control is endangered by a dam or reservoir, the department shall investigate or cause an investigation to be made of the complaint. (4) DISCRETIONARY INSPECTION. The department may inspect or cause an inspection to be made of any dam or reservoir. (5) ORDER; REDUCTION IN WATER LEVEL. If the department finds pursuant to an investigation that a dam or reservoir is not sufficiently strong or is unsafe and that the dam or reservoir is dangerous to life or property, it shall determine what alterations, additions or repairs are necessary and shall order the owner or person having control of the dam or reservoir to cause those alterations, additions or repairs to be made within a time specified in the order. If the department finds pursuant to an investigation that a dam or reservoir is not sufficiently strong or is unsafe and that the dam or reservoir is dangerous to life or property, it may cause to be drawn off, in whole or in part, the water in the reservoir or impounded by the dam if it determines that this action is necessary to prevent impending danger to persons or property.
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