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DENVER BASIN BEDROCK AQUIFERS <br /> WATER LEVEL MEASUREMENTS <br /> 2025 <br /> This report updates basic data concerning the depth to and elevation of groundwater in the four <br /> main Denver Basin bedrock aquifers collected during 2025. The report is organized first by <br /> aquifer, then by well name. Well completion information is provided, where available. Wells <br /> whose construction information indicates they are completed in more than one aquifer are <br /> grouped in this report according to the uppermost aquifer. <br /> Approximately 73 water-level measurements in this year's report were obtained by Division of <br /> Water Resources (Division) personnel. Additionally, a total of six wells have been instrumented <br /> with data loggers to collect daily water-level data. These include the following: <br /> • four wells in the Castle Rock area that monitor all four Denver Basin aquifers; CO3_LTDW <br /> (DB-204), CO3_TKD (DB-205), C06_KA (DB-206) and CO3_KLF (DB-203); and <br /> • two wells near Golden in the Pleasant View Metropolitan District are completed in the <br /> Arapahoe (DB-201) and Laramie-Fox Hills (DB-200) aquifers. <br /> Water-level data from 37 cooperator wells are also included in this report. Personnel from <br /> cooperating water districts and municipalities graciously provided these data upon request. The <br /> Division appreciates the cooperation of the many entities that provide water-level information. <br /> Tabular data are presented for each well for the previous ten years. Graphical data show the <br /> entire period of record for each well. Wells lacking measurements in the past 10 years have been <br /> removed from the monitoring program and are no longer included in this publication, although the <br /> data are retained in the Division's HydroBase database. <br /> Analyses of water-level changes in the aquifers are based on single point comparisons and may be <br /> complicated by unknown pumping schedules or other site-specific hydrologic factors. Table 1 <br /> summarizes some of these water-level changes for each aquifer based on only those wells <br /> measured in 2025. <br /> Maps were created to show the spatial distribution of wells by production aquifer and include all <br /> wells measured within the past 10 years. Color-coded maps were created to show the change in <br /> water levels (by aquifer) for a one-year period (2024-2025) and include only those wells measured <br /> in 2025. The changes, both positive and negative, are displayed by color in accordance with the <br /> map key. <br />