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<br />otH 90" <br /> <br />. <br /> <br />. <br /> <br />, <br />II' <br /> <br />WATER- LEVEL RECORDS FOR ADAMS, LARIMER, LOGAN, MORGAN, <br /> <br />SEDGWICK, WASHINGTON, AND WELD COUNTIES, COLORADO, 1973-77 <br /> <br />. <br /> <br />By Thomas J. Major and Kenneth D. Vaught <br /> <br />ABSTRACT <br /> <br />Water levels measured during March 1977 in 350 wells tapping alluvial <br />aquifers in Adams, Larimer, Logan, Morgan, Sedgwick, Washington, and Weld <br />Counties, Colo., are included in this report. Water-level records for the 4 <br />preceding years also are included to serve as references illustrating <br />declining or rising water levels. <br /> <br />Water-level measurements made in March 1977 do not <br />precipitation deficiencies of the winter of 1976-77. <br /> <br />reflect <br /> <br />the <br /> <br />f <br /> <br />INTRODUCTION <br /> <br />This report provides well owners and water managers with water-level <br />measurements made during March 1977 prior to the irrigation season in Adams, <br />Larimer, Logan, Morgan, Sedgwick, Washington, and Weld Counties, Colo. <br />(fig. 1). These data, arranged in county order (table 1, at back of report), <br />can be used by well owners for planning their irrigation schedules for the <br />next irrigation season and can be used by water managers for developing plans <br />to manage the ground-water resources. Water-level records for the 4 preceding <br />years also are included to serve as references illustrating declining or <br />rising water levels. <br /> <br />Water-level records for Adams, Larimer, Logan. Morgan, Sedgwick, <br />Washington, and Weld Counties, Colo., are a part of the National Water-Data <br />System collected and tabulated by the U.S. Geological Survey in cooperation <br />with the Colorado Department of Natural Resources, Division of Water <br />Resources, Office of the State Engineer. <br /> <br />. <br /> <br />Water-level measurements were made in 350 wells tapping the alluvial <br />aquifer along the South Platte River and its tributaries. The aquifers are in <br />valley-fill alluvium along the rivers or in adjacent terrace alluvium. Most <br />of these wells are irrigation wells, but several stock and government-owned <br />wells also were measured, especially in areas where there are no irrigation <br />wells available for monitoring water levels and water-level changes. The <br />12,400-mi2 (32,100-km2) study area includes all of Adams, Logan, Morgan, <br /> <br />1 <br />