(1) Until the date determined under subsection (2), the eighty-first district consists of the counties of Alcona, Arenac, Iosco, and Oscoda, is a district of the first class, and has 1 judge.

    (2) Beginning on the date on which a vacancy occurs in the office of district judge in the eighty-first district or the beginning date of the term for which the incumbent district judge in the eighty-first district no longer seeks election or reelection to that office, whichever is earlier, all of the following apply:

    (a) The eighty-first district consists of the counties of Alcona, Arenac, Iosco, and Oscoda and is a district of the first class.

    (b) Under section 810a, the probate judge for the county of Alcona shall serve as judge of the eighty-first district within the county of Alcona.

    (c) Under section 810a, the probate judge for the county of Arenac shall serve as judge of the eighty-first district within the county of Arenac.

    (d) Under section 810a, the probate judge for the county of Iosco shall serve as judge of the eighty-first district within the county of Iosco.

    (e) Under section 810a, the probate judge for the county of Oscoda shall serve as judge of the eighty-first district within the county of Oscoda.