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;,...:..." 9' .f\~ "- .~'~ .' "U' -.) .~j J J ;, a cooperative agreement between the U.S. Geological Survey and the Colorado Geological Survey of the Colorado Department o~Natural Resources. Field-data collection was done by personnel of the Frenchman, Central Yuma, Sand Hills, and Marks Butte Ground Water Management Districts and the U.S. Geological Survey. Data from the field survey were added to the large, historical ground-water data base maintained in computers of the U.S. Geological Survey. Prior to 1986, ground-water information was obtained in cooperation with various State and local agencies and entities and also by several Federal programs. Organizations that helped obtain this ground-water information include: Colorado Geological Survey; Colorado Division of Water Resources, Office of the State Engineer; Colorado State University; Colorado Water Conservation Board; Frenchman Ground Water Management District; Central Yuma Ground Water Management District; Sand Hills Ground Water Management District; Marks Butte Ground Water Management District; Arikaree Ground Water Management District; Eastern Cheyenne Ground Water Management District; Plains Ground Water Management District; Washington-Yuma Ground Water Management District; and Southern High Plains Ground Water Management District. SYSTEM OF NUMBERING WELLS Well locations in this report are given local well numbers, based on the U.S. Bureau of Land Management system of land subdivision, and show the location of the well by quadrant, township, range, section, and position within the section (fig. 2). The first letter "s" preceding the location number indicates that the well is located in the area governed by the Sixth Principal Meridian. The second letter indicates the quadrant in which the well is located. Four quadrants are formed by the intersection of the base line and the principal meridian--A indicates the northeast quadrant, B the northwest, C the southwest, and D the southeast. The first three digits of the number indicate the township, the next three digits the range, and the last two digits the section in which the well is located. The letters following the section number locate the well within the section. The first letter denotes the quarter section, the second the quarter-quarter section, and the third the quarter-quarter-quarter section. The letters are assigned within the section in a counterclockwise direction, beginning with A in the northeast quarter section and within each quarter- quarter section in the same manner. Where two or more locations are within the smallest subdivision, consecutive numbers beginning with 1 are added in the order in which the data from the wells or springs were collected. For readers who wish to locate the wells, the townships and ranges are shown on plate 1. Another number, station-identification number, is assigned according to the grid system of latitude and longitude. The number consists of 15 digits. The first six digits denote the degrees, minutes, and seconds of latitude; the next seven digits denote degrees, minutes, and seconds of longitude, and the last two digits (assigned sequentially) identify the wells within a I-second grid. In the rare instance where the initial latitude and longitude was in error and has been redetermined, the station will retain its original identi- fication number. 3