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Melissa D. Masbruch

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The Upper Colorado River Basin has a drainage area of about 113,500 square miles in western Colorado, eastern Utah, southwestern Wyoming, northeastern Arizona, and northwestern New Mexico. In the 1980’s and 1990’s, the Upper Colorado River Basin was a study area under of the U.S. Geological Survey's Regional Aquifer-System Analysis (RASA) program (Sun and Johnston, 1994; Sun and Weeks, 1991). The objectives of the RASA program for the Upper Colorado River Basin were to provide regional assessments of major aquifer systems by providing quantitative assessments of the occurrence, movement, and availability of water stored in rock formations that underlie the basin/watershed. These assessments included: (1) the classification...
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A previously developed three-dimensional steady-state numerical groundwater-flow model was modified to transient conditions with respect to well withdrawals, and used to simulate drawdown and capture of natural discharge from existing and proposed groundwater withdrawals in Snake Valley and adjacent areas in western Utah and eastern Nevada. The original steady-state model simulates and was calibrated to 2009 conditions and was used as the first stress period in this transient model. Six transient stress periods, spanning 2010-2114, were added to the model to assess timing of the potential withdrawal effects. A seventh steady-state stress period was also added to determine the ultimate long-term effects of the well...
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A previously developed numerical groundwater flow model of the eastern Great Basin was used to investigate where potential drawdown and capture of natural discharge is likely to result from potential groundwater withdrawals from existing and applied for groundwater rights in Snake Valley, Utah and Nevada. SIR 2014-5213 (https://doi.org/10.3133/sir20145213), SIR 2017–5011 (https://doi.org/10.3133/sir20175011), and SIR 2017-5072 (https://doi.org/10.3133/sir20175072) document the construction and calibration of the previous versions of this model. The eastern Great Basin model consists of a parent model and a child model. The parent model covers the focus study area and was used for the simulations presented in this...
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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This dataset was created in support of a study focusing on groundwater resources in the Great Basin carbonate and alluvial aquifer system (GBCAAS). The GBCAAS is a complex aquifer system comprised of both unconsolidated and bedrock formations covering an area of approximately 110,000 square miles. The aquifer system is situated in the eastern portion of the Great Basin Province of the western United States. The eastern Great Basin...
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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This dataset was created in support of a study focusing on groundwater resources in the Great Basin carbonate and alluvial aquifer system (GBCAAS). The GBCAAS is a complex aquifer system comprised of both unconsolidated and bedrock formations covering an area of approximately 110,000 square miles. The aquifer system is situated in the eastern portion of the Great Basin Province of the western United States. The eastern Great Basin...
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