Reconnaissance of the Ground-Water Resources of the Upper Fremont River Valley, Wayne County, Utah (TP-22)

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The upper Fremont River valley, a depression caused by faulting, altered by erosion, and partly filled by alluvium eroded from surrounding highlands, includes about 40 square miles in south-central Utah. The drainage basin which contributes water to the valley includes about 700 square miles. Water drains to the valley from several high plateaus. Sedimentary rocks of Triassic, Jurassic, Tertiary, and Quaternary age and volcanic rocks of Tertiary age are exposed in the area. The Tertiary volcanic rocks yield water to several large springs and flowing wells; this unit is the principal source of ground water in the valley. The valley fill of Quaternary age, which is more than 500 feet thick in places, is also an important source, yielding water to many wells.

This report presents the results of an investigation of the ground-water resources of the upper Fremont River valley, Utah. The purpose of the investigation was to determine: the source, occurrence, availability, approximate quantity, movement, and chemical quality of ground water in the valley; the recharge to and discharge from the ground-water reservoir; the extent and effects of use and development on the ground-water resources; the relation of ground water to streamflow; and if and where additional studies are needed. The report is concerned primarily with ground water in the valley fill and adjacent volcanic rocks and secondarily with the general hydrology of the upper Fremont River valley drainage basin.

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