Preliminary map showing availability of ground water from major glacial-drift aquifers in Griggs and Steele Counties, North Dakota

This investigation is part of a statewide program to determine the location, extent, and hydrologic characteristics of the ground-water reservoirs (aquifers).

The investigation was made cooperatively by the U.S. Geological Survey, North Dakota State Water Commission, North Dakota Geological Survey, and Griggs and Steele Counties Water Management Districts.

This preliminary map is the first product of an intensive study of Griggs and Steele Counties. A well inventory provided data on depth, construction, and productivity of private and public wells. Test drilling by the North Dakota State Water Commission, Federal agencies, and commercial well drillers provided information regarding the thickness, grain size, and extent of the aquifers. Potential well yields were estimated from the thickness and hydraulic conductivity of the water-bearing materials logged at each test hole, and from aquifer tests. Generally, the yield of a well is proportional to the hydraulic conductivity and thickness of the aquifer.