Surface Water Characteristics. The Missouri, Niobrara, and White Rivers flow through here. There is a limited supply of ground water available. Shallow water developments exist, such as dug ponds and small reservoirs. Some deep artesian wells exist.
Reservoirs occur on the Missouri river.
Fire, insects, and disease are the primary natural disturbances. Most of the area is in farms or ranches, with limited urban expansion. About 50 percent of the area is in dry crops. Grazing is common, especially on the Dakota-Nebraska Tableland. Irrigation occurs along the Missouri River.