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.