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Measurements of ground-water levels made at 58 wells during water year 1987 and summary of estimated pumpage for water years 1986 and 1987 in Carson Valley, Douglas County, Nevada, are presented. The data were collected to provide a record of ground-water changes over the long term and pumpage estimates that can be incorporated into an existing groundwater model. The estimated total pumpage in water year 1986 was 10,200 acre-feet and in water year 1987 was 13,400 acrefeet. Ground-water levels exhibited seasonal fluctuations but remained relatively stable over the reporting period throughout most of the valley. INTRODUCTION and Scope Ground-water levels were measured at 58 wells in Carson Valley as part of a cooperative data-collection program between the U.S. Geological Survey and the Douglas County Department of Public Works. Estimates of municipal, agricultural, domestic, and aquacultural pumpage were also collected and summarized. The purpose of this datacollection program was to record changes in ground-water levels over the long-term and to collect records of ground-water pumpage for incorporation into the existing ground-water flow model (Maurer, 1986) . This report presents data compiled during the second year of this datacollection program. Ground-water measurements reported herein were made during the 1987 water year (October 1, 1986, through September 30, 1987) . Estimates of pumping volumes are for the water years 1986-87. Description of Study Area Carson Valley lies on the western edge of the Great Basin and is part of the Carson River drainage basin (figure 1) . The valley is bounded on the west by the Carson Range of the Sierra Nevada and on the east by the Pine Nut Mountains. The north end of the valley is approximately 4 miles south of Carson City, the capital of Nevada. The drainage basin of Carson Valley is about 280,000 acres (about 15 by 24 miles). The valley is inhabited by a population of about 25,000.

Ground-water levels in water year 1987 and estimated ground-water pumpage in water years 1986-87, Carson Valley, Douglas County, Nevada