On July 4, 1929, a 20-foot wave that scientists now believe was caused by a meteotsunami crashed over holiday beach-goers on a pier in Grand Haven. Ten people were pulled out into Lake Michigan and drowned.
Sources:
Researchers find tsunamis on the Great Lakes“, MLive, April 27, 2016.
Keith Matheny, “Tsunamis? On the Great Lakes? They happen — sometimes with deadly results“, Detroit Free Press, June 19, 2017.