If, in the opinion of the commission, there is not free passage for fish over or around any dam, the department shall cause plans to be furnished for a suitable fishway, and order in writing the owner of the dam to provide the dam, within a specified time, with a durable and efficient fishway, of such form and capacity and in such location as shall be determined by the department. Such fishway shall be completed by the owner of the dam to the satisfaction of the department within the time specified.