This report (59 pages and 2 appendices) describes how Ashley Spring is an important water supply for most of the residents in the Vernal area of Uintah County, Utah. The Utah Geological Survey conducted a study to determine the baseline flow paths and water chemistry of the aquifer systems that provide water to the spring. Ashley Spring water is of high quality, which does not vary long term. Seasonal fluctuations in spring-water chemistry are due to snowmelt and precipitation patterns. A substantial part of the water emanating from Ashley Spring has been in the groundwater system less than one week, originating as recharge at areas along Dry Fork where water seeps into sinks and fractures