Regional Water Table (2000) and Ground-Water-Level Changes in the Mojave River and the Morongo Ground-Water Basins, Southwestern Mojave Desert, California
By Gregory A. Smith
U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 02-4277
Sacramento, California 2003
Prepared in cooperation with the Mojave Water Agency
Complete accessible text of report (6.9 MB PDF)
Plate 1 (2.2 MB)
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The text below provides the alternative text for this graphic image.
This plate shows the location of 500 well sites and each site's measured water-level altitude
(2000) in the Mojave River and Morongo ground water basins, southwestern Mojave Desert, California.
The ground-water altitudes are contoured to show the regional water table and the general direction of
ground-water flow. Selected wells show long-term (70 years) or short-term (5 years) water-level
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AbstractThe Mojave River and Morongo ground-water basins are in the southwestern part of the Mojave Desert in southern California. Ground water from these basins supplies a major part of the water requirements for the region. The continuous population growth in this area has resulted in ever-increasing demands on local ground-water resources. The collection and interpretation of ground-water data helps local water districts, military bases, and private citizens gain a better understanding of the ground-water systems, and consequently, water availability.
During 2000, the U. S. Geological Survey and other agencies made approximately 2,500 water-level measurements in the Mojave River and the Morongo ground-water basins. These data document recent conditions and, when compared with previous data, changes in ground-water levels. A water-level contour map was drawn using data from about 500 wells, providing coverage for most of the basins. Twenty-nine hydrographs show long-term (up to 70 years) water-level conditions throughout the basins, and 13 short-term (1996 to 2000) hydrographs show the effects of recharge and discharge along the Mojave River. In addition, a water-level-change map was compiled to compare 1998 and 2000 water-levels throughout the basins.
In the Mojave River ground-water basins, water-level data showed little change from 1998 to 2000, with the exception of areas along the Mojave River. Water levels along the Mojave River were typically in decline or unchanged, with exceptions near the Hodge and the Lenwood outlet, where water levels rose in response to artificial recharge. The Morongo ground-water basin had virtually no change in water levels from 1998 to 2000, with the exception of Yucca Valley, where artificial recharge and ground-water withdrawal continues.
Description of Study Area
Ground-Water Levels and Flow
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Water Resources of California