Johanna Voortman 87 Sioux Center, Iowa May 28, 2018 Johanna Voortman, 87, of Sioux Center, Iowa, passed away Monday, May 28, 2018, at Royale Meadows Care Center, Sioux Center. Funeral service was Friday, June 1, at First Reformed Church, Sioux Center, with interment in Memory Gardens Cemetery, Sioux Center. Johanna Wilhelmina Riphagen was born April 24,…