Harry A. Marquardt, 80, of Waterloo, passed away April 17, 2025, in St. Louis, Missouri. The visitation will be from 4-8 p.m. on Tuesday, April 22 and from 9-10 a.m. on Wednesday, April 23 at Quernheim Funeral Home in Waterloo. The funeral service will be held at 10 a.m. on Wednesday, April 23 at Quernheim Funeral Home with Father Linus Umoren officiating. Burial will be at SS Peter & Paul Cemetery in Waterloo.