Spalding, R. F., 1975. Effects of Land Use and River Seepage on Groundwater Quality in Hall County, Nebraska (WSP-38): 95 pp., size 8.5" x 11". Description: Hall County lies. Three-fourths of the county lies within the broad river valley. Hall County is centrally located in the Loess Plains District of the High Plains Section of the Great Plains Physiographic Province. Generally the Loess Plains District consists of gently sloping interstream uplands separated by wide valleys. These valleys are occupied by shallow, braided streams that are bordered by low terraces.