Montcalm County officials on Friday searched Little Whitefish Lake in Pierson Township, about 25 miles northeast of Grand Rapids, for Dalton Gustinis.
Authorities said the boys went fishing late Thursday and the boat started sinking. Two of the boys made it to shore and were treated for mild hypothermia.
A helicopter was used early in the search. The Sheriff’s Department said the lake’s size made it difficult to determine where the accident happened, and sleet and cold rain hampered search efforts.