MS-21 Groundwater Temperatures Map of Colorado Download Publication Details This map shows contoured groundwater temperatures in degrees Celsius (?C) based on thermal springs or wells, which are identified by a point with corresponding temperature. Contours range from 5 to 20 ?C. Higher temperatures were not contoured. Also included are some representative well points with corresponding temperature where there were too few data points to contour. 1 plate (1:1,000,000). Digital PDF download. MS-21D Citations Repplier, Frank N., M. M. Rell, and R. K. Columbia. “MS-21 Groundwater Temperatures Map of Colorado.” Groundwater Temperatures. Map Series. Denver, CO: Colorado Geological Survey, Department of Natural Resources, 1981. https://coloradogeologicalsurvey.org/publications/groundwater-temperatures-map-colorado.