Four boreholes (MW1, MW1UZ, MW2, MW2.1) were drilled in the fall of 2017 and summer of 2018 in upper Redwell Basin, a headwater catchment underlain by hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. The boreholes were continuously cored using a wireline HQ-sized coring system and sample a combination of Quaternary-aged surficial colluvium and the Cretaceous-aged Mesaverde Formation. In-situ injection-based hydraulic tests were performed in MW1 and MW2 during drilling while advancing using a single-packer apparatus in tandem with an in-line flow meter and interval pressure monitoring. Borehole geophysical logging was performed in MW1, MW1UZ, and MW2.1 in the open holes. The boreholes were completed as vertically discrete nested monitoring wells. Pressure transducers have been deployed in selected wells to monitor groundwater level and fluid temperature over time. This data release includes borehole location and well completion information as well as related hydrologic and geophysical data. The borehole geophysical data directory contains borehole geophysical logs. The hydraulic test data directory contains in-situ packer test data and laboratory permeability/porosity results from selected core samples. The hydrologic monitoring data directory contains groundwater level and temperature data for selected wells.

Four boreholes (MW1, MW1UZ, MW2, MW2.1) were drilled in the fall of 2017 and summer of 2018 in upper Redwell Basin, a headwater catchment underlain by hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. The boreholes were continuously cored using a wireline HQ-sized coring system and sample a combination of Quaternary-aged surficial colluvium and the Cretaceous-aged Mesaverde Formation. In-situ injection-based hydraulic tests were performed in MW1 and MW2 during drilling while advancing using a single-packer apparatus in tandem with an in-line flow meter and interval pressure monitoring. Borehole geophysical logging was performed in MW1, MW1UZ, and MW2.1 in the open holes. The boreholes were completed as vertically discrete nested monitoring wells. Pressure transducers have been deployed in selected wells to monitor groundwater level and fluid temperature over time. This data release includes borehole location and well completion information as well as related hydrologic and geophysical data. The borehole geophysical data directory contains borehole geophysical logs. The hydraulic test data directory contains in-situ packer test data and laboratory permeability/porosity results from selected core samples. The hydrologic monitoring data directory contains groundwater level and temperature data for selected wells.

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Two boreholes were completed as vertically discrete nested monitoring wells (MW1 as MW1A-MW1D and MW2.1 as MW2.1A-MW2.1C) and one borehole was completed as a single monitoring well (MW2 as RP8). Site locations and well construction are documented under the main page of this data release. Absolute (non-vented) pressure and temperature data loggers (PTDs) were deployed in these wells to monitor groundwater levels and fluid temperature over time. The period of record covers August 2018-September 2019 for all wells; the period of record for MW1D covers October 2017 to September 2019. Barometric pressure and surface temperature were monitored with a single PTD at the ground surface inside one well cover for the majority of the period of record. In addition to long-term monitoring, manual measurements of well water levels were collected as depth-to-water measurements (MW1A-D and RP8) or well-head gauge pressures (MW2.1A-C). Pressure, temperature, and water-level elevation data are provided for each well over the available period of record. Manual water level measurements are also provided. Unprocessed records are archived in a separate compressed (zip) directory. Attributes for all files are described in the data directory.

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Two boreholes were completed as vertically discrete nested monitoring wells (MW1 as MW1A-MW1D and MW2.1 as MW2.1A-MW2.1C) and one borehole was completed as a single monitoring well (MW2 as RP8). Site locations and well construction are documented under the main page of this data release. Absolute (non-vented) pressure and temperature data loggers (PTDs) were deployed in these wells to monitor groundwater levels and fluid temperature over time. The period of record covers August 2018-September 2019 for all wells; the period of record for MW1D covers October 2017 to September 2019. Barometric pressure and surface temperature were monitored with a single PTD at the ground surface inside one well cover for the majority of the period of record. In addition to long-term monitoring, manual measurements of well water levels were collected as depth-to-water measurements (MW1A-D and RP8) or well-head gauge pressures (MW2.1A-C). Pressure, temperature, and water-level elevation data are provided for each well over the available period of record. Manual water level measurements are also provided. Unprocessed records are archived in a separate compressed (zip) directory. Attributes for all files are described in the data directory.

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by mineralized and hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Site locations and well construction are documented under the main page of this data release. Hydraulic data were acquired during drilling and on core samples to estimate the hydraulic properties of selected geologic materials. While advancing the drill stem, long-interval packer tests were conducted in MW1 and MW2 boreholes to measure in-situ formation permeability. The open borehole interval targeted for each hydraulic test was exposed by raising the drill stem about 10 m above the bottom of the hole. A single-bladder packer apparatus was seated below the drill bit to seal the test interval. A stepped constant-head injection test was performed for each reported interval. Water was injected into the test interval to a target pressure by adjusting and monitoring flow rate using an in-line flowmeter. When flow rate and pressure achieved approximate steady state, the test progressed to a new pressure step. In most cases, multiple pressure steps were applied and repeated in both increasing and decreasing step directions while testing each interval. This release includes synchronized test-interval pressure and flow meter data for packer tests performed in MW1 and MW2 boreholes. Attributes for all files are described in the data directory. Permeability and porosity measurements were also attained through gas permeameter tests conducted on selected drill-core samples from MW1, MW2, and MW2.1. Samples were submitted for testing to Schlumberger Reservoir Laboratories. Test methods and results are described in the lab report. Results are additionally provided in a tabular format to meet open-data requirements.

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by mineralized and hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Site locations and well construction are documented under the main page of this data release. Hydraulic data were acquired during drilling and on core samples to estimate the hydraulic properties of selected geologic materials. While advancing the drill stem, long-interval packer tests were conducted in MW1 and MW2 boreholes to measure in-situ formation permeability. The open borehole interval targeted for each hydraulic test was exposed by raising the drill stem about 10 m above the bottom of the hole. A single-bladder packer apparatus was seated below the drill bit to seal the test interval. A stepped constant-head injection test was performed for each reported interval. Water was injected into the test interval to a target pressure by adjusting and monitoring flow rate using an in-line flowmeter. When flow rate and pressure achieved approximate steady state, the test progressed to a new pressure step. In most cases, multiple pressure steps were applied and repeated in both increasing and decreasing step directions while testing each interval. This release includes synchronized test-interval pressure and flow meter data for packer tests performed in MW1 and MW2 boreholes. Attributes for all files are described in the data directory. Permeability and porosity measurements were also attained through gas permeameter tests conducted on selected drill-core samples from MW1, MW2, and MW2.1. Samples were submitted for testing to Schlumberger Reservoir Laboratories. Test methods and results are described in the lab report. Results are additionally provided in a tabular format to meet open-data requirements.

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by mineralized and hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Site locations and well construction are documented under the main page of this data release. Hydraulic data were acquired during drilling and on core samples to estimate the hydraulic properties of selected geologic materials. While advancing the drill stem, long-interval packer tests were conducted in MW1 and MW2 boreholes to measure in-situ formation permeability. The open borehole interval targeted for each hydraulic test was exposed by raising the drill stem about 10 m above the bottom of the hole. A single-bladder packer apparatus was seated below the drill bit to seal the test interval. A stepped constant-head injection test was performed for each reported interval. Water was injected into the test interval to a target pressure by adjusting and monitoring flow rate using an in-line flowmeter. When flow rate and pressure achieved approximate steady state, the test progressed to a new pressure step. In most cases, multiple pressure steps were applied and repeated in both increasing and decreasing step directions while testing each interval. This release includes synchronized test-interval pressure and flow meter data for packer tests performed in MW1 and MW2 boreholes. Attributes for all files are described in the data directory. Permeability and porosity measurements were also attained through gas permeameter tests conducted on selected drill-core samples from MW1, MW2, and MW2.1. Samples were submitted for testing to Schlumberger Reservoir Laboratories. Test methods and results are described in the lab report. Results are additionally provided in a tabular format to meet open-data requirements.

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by mineralized and hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Site locations and drilling procedures are documented under the main page of this data release. Borehole geophysical data were collected in boreholes MW1, MW1UZ, and MW2.1 as open holes prior to well construction. Logging was performed by a combination of USGS and Mount Sopris Instruments (MW1) and University of Wyoming (MW1UZ and MW2.1) staff. Log types vary by well on the basis of available equipment, site limitations, and borehole conditions. In borehole MW1, log types include fluid temperature and conductivity, three-arm caliper, natural gamma, acoustic televiewer (ATV), full-waveform sonic (FWS), and heat-pulse flowmeter (HPF). In borehole MW2.1, log types include fluid temperature and conductivity, three-arm caliper, natural gamma, spectral gamma, ATV, optical televiewer (OTV), FWS, long/short normal resistivity, single-point resistance, self-potential, and nuclear magnetic resonance (NMR). OTV logs are provided for borehole MW1UZ. Data are provided in log-ascii standard (LAS) formatted files; data are self-described within the header of each LAS file following the formatting guidelines established by the Canadian Well Logging Society (CWLS, 2017,2020).

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by mineralized and hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Site locations and drilling procedures are documented under the main page of this data release. Borehole geophysical data were collected in boreholes MW1, MW1UZ, and MW2.1 as open holes prior to well construction. Logging was performed by a combination of USGS and Mount Sopris Instruments (MW1) and University of Wyoming (MW1UZ and MW2.1) staff. Log types vary by well on the basis of available equipment, site limitations, and borehole conditions. In borehole MW1, log types include fluid temperature and conductivity, three-arm caliper, natural gamma, acoustic televiewer (ATV), full-waveform sonic (FWS), and heat-pulse flowmeter (HPF). In borehole MW2.1, log types include fluid temperature and conductivity, three-arm caliper, natural gamma, spectral gamma, ATV, optical televiewer (OTV), FWS, long/short normal resistivity, single-point resistance, self-potential, and nuclear magnetic resonance (NMR). OTV logs are provided for borehole MW1UZ. Data are provided in log-ascii standard (LAS) formatted files; data are self-described within the header of each LAS file following the formatting guidelines established by the Canadian Well Logging Society (CWLS, 2017,2020).

Boreholes were drilled in 2017 and 2018 in Redwell Basin, a headwater catchment underlain by mineralized and hydrothermally altered sedimentary rock in the Elk Mountains near the town of Crested Butte, Colorado. Site locations and drilling procedures are documented under the main page of this data release. Borehole geophysical data were collected in boreholes MW1, MW1UZ, and MW2.1 as open holes prior to well construction. Logging was performed by a combination of USGS and Mount Sopris Instruments (MW1) and University of Wyoming (MW1UZ and MW2.1) staff. Log types vary by well on the basis of available equipment, site limitations, and borehole conditions. In borehole MW1, log types include fluid temperature and conductivity, three-arm caliper, natural gamma, acoustic televiewer (ATV), full-waveform sonic (FWS), and heat-pulse flowmeter (HPF). In borehole MW2.1, log types include fluid temperature and conductivity, three-arm caliper, natural gamma, spectral gamma, ATV, optical televiewer (OTV), FWS, long/short normal resistivity, single-point resistance, self-potential, and nuclear magnetic resonance (NMR). OTV logs are provided for borehole MW1UZ. Data are provided in log-ascii standard (LAS) formatted files; data are self-described within the header of each LAS file following the formatting guidelines established by the Canadian Well Logging Society (CWLS, 2017,2020).