Hydrologic and geophysical data from high-elevation boreholes in Redwell Basin near Crested Butte, Colorado: Hydraulic test data

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.