Hydrogeological and climatic data related to recent (1970-2022) development of the Troublesome Aquifer in the Greater Pole Creek Basin, Grand County, Colorado

The upper portion of the Troublesome Aquifer is the sole source of water for domestic use in the Greater Pole Creek Basin, situated in the western portion of the upper Fraser River Valley in Grand County, Colorado. Data from drilling records for wells installed near and within recent home developments, municipal water-suppliers, water-quality records, and published reports are summarized as an initial synthesis of aquifer water quantity and quality. In spite of persistent drought and increased domestic aquifer-water usage, aquifer water storage remains robust with water levels little changed during the past 25 years. Water-quality data indicate substantial variability with depth beneath the top of the aquifer. Data from wells completed in the overlying shallow alluvial aquifer are also presented for comparison. This document constitutes a new baseline for assessment of current and future groundwater resources within this portion of the upper Fraser River valley. Suggested future investigations include water-table monitoring and comprehensive water-quality surveys for water derived from wells completed in the Troublesome Aquifer.