Ground-water areas and well logs, Central Sevier Valley, Utah

Between September 1959 and June 1960 the United States Geological Survey and the Utah State Engineer, with financial assistance from Garfield, Millard, Piute, Sanpete, and Sevier Counties and from local water-users' associations, cooperated in an investigation to determine the structural framework of the central Sevier Valley and to evaluate the valley's ground-water potential. An important aspect of the study was the drilling of 22 test holes under private contract. These data and other data collected during the course of the larger ground-water investigation of which the test drilling was a part will be evaluated in a report on the geology and ground-water resources of the central Sevier Valley. The present report has been prepared to make available the logs of the test holes and to describe in general terms the availability of ground water in the different areas of the valley.

The test holes were located to determine the subsurface geology of the valley, but of principal interest for this report is the water-bearing materials that were penetrated by the test holes. Ten of the holes penetrated materials capable of yielding sufficient water for irrigation; 10 holes penetrated water-yielding materials that could supply water for domestic or stock use; 2 holes were unsuccessful as water prospects but supplied geologic information.

Generally, the water in the test holes was of good quality for stock, domestic, or irrigation use, except in test holes 1, 2, 4, 5, 16, 17, and 19 where water from some beds was highly mineralized. Water from the upper water-bearing bed in test holes 1, 2, 4, 5 and 16 and from the 6 upper water-bearing beds in test hole 19 was high in sodium chloride and sodium sulphate and would be unpalatable to humans and stock. The upper water in test hole 17 would be palatable to stock accustomed to brackish water, but the water from below 78 feet is too saline for any use.

The central Sevier Valley has been divided into arbitrary ground-water areas that are based in part on topographic and geologic boundaries. The test holes are described by areas downstream from south to north, and the logs of table 1 are arranged from south to north.