The First Division consists of the Glendive Unit and its extension. It serves 13,254 acres of irrigable land extending from Fallon to Glendive along the west bank of the Yellowstone River. No storage is provided as the water is pumped directly from the Yellowstone River to the Main Canal by motor-driven pumps. The Second Division serves 9,465 acres of irrigable land along the south bank of the Yellowstone River between Miles City and Fallon, Montana. Three separate tracts of irrigable land are designated as the Shirley, Terry, and Fallon Units.
Water is pumped directly from the Yellowstone River for each unit.
Pumping plants Glendive Pumping Plant Nos. 1 and 2 serve the First Division. Shirley, Terry, Fallon, and Fallon Relift Pumping Plants serve the Second Division. All the pumps are operated electrically with power supplied from the Pick-Sloan Missouri Basin Program. Each unit has a separate canal and lateral system with appurtenant water control structures to provide for distribution of water to the land.