Maple River Grain & Agronomy LLC was formed on June 1, 2004 with the merger of the Farmer's Cooperative Elevator Company of Prosper, AGP Grain of Casselton, and Chaffee-Lynchburg Farmer's Elevator. Construction of the new grain facility in Casselton, ND began on April 16, 2004. The facility became fully operational in April of 2005.