This report is intended to serve two purposes: To make available basic ground water data useful in planning and studying water resources development and to supplement an interpretive report that will be published later. The records were collected during the investigation of the geology and ground water resources of the Denver Basin made by the USGS from 1956-1963. This report should be most useful in predicting conditions likely to be encountered when drilling a new well. The proposed drilling site can be located on plates 1 or 2, and the records of nearby wells can be examined. Other significant factors can determined from Table 1-9 as follows: whether it is practical to drill deeper in search of water; the success or failure of nearby wells, type of materials likely to be penetrated by the proposed well; physical properties of promotion materials; fluctuations and trends of the water table; and quality of water in relation to the intended use.