MLRA 64 - Mixed Sandy and Silty Tableland Nebraska, South Dakota, and Wyoming 28,400 km2 (10,970 mi2)

Water:
Most of the area depends on the rather low and erratic precipitation for water. Ground water is scarce and of poor quality in most of the area. Locally, mainly south of Pine Ridge, underground sand and gravel yield moderate to large quantities of good quality water.

12/16/98