1.  Occupation of shoreland by 2 or more municipalities.  Two or more municipalities, which collectively occupy enough of the shoreland on a river segment to be effective in managing the shorelands of the river, have entered into an agreement under chapter 115, which satisfies the requirements of section 4464;  

2.  Comprehensive plan.  The same municipalities have prepared a comprehensive plan which satisfies the requirements of section 4465;  

3.  Ordinance.  The same municipalities have prepared an ordinance to implement the comprehensive plan which satisfies the requirements of section 4466; and  

4.  Other commissions.  No other commission exists on the same river, or the distance between the proposed and existing commissions makes the formation of one larger commission impractical.