Smith, G. A., Stamos, C. L., and Predmore, S. K. 2004 vector digital data Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?cont2002 The 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 flow systems, and consequently, water availability. During 2002, the U.S. Geological Survey and other agencies made approximately 2,500 water-level measurements in the Mojave River and 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 660 wells, providing coverage for most of the basins. Twenty-eight hydrographs show long-term (up to 70 years) water-level conditions throughout the basins, and 9 short-term (1997 to 2002) hydrographs show the effects of recharge and discharge along the Mojave River. In addition, a water-level-change map was compiled to compare 2000 and 2002 water levels throughout the basins. In the Mojave River ground-water basin, about 66 percent of the wells had water-level declines of 0.5 ft or more since 2000 and about 27 percent of the wells had water-level declines greater than 5 ft. The only area that had water-level increases greater than 5 ft that were not attributed to fluctuations in nearby pumpage was in the Harper Lake (dry) area where there has been a significant reduction in pumpage during the last decade. In the Morongo ground-water basin, about 36 percent of the wells had water-level declines of 0.5 ft or more and about 10 percent of the wells had water-level declines greater than 5 ft. Water-level increases greater than 5 ft were measured only in the Warren subbasin, where artificial-recharge operations have caused water levels to rise almost 60 ft since 2000. This data set is a digital representation of the contours presented on the map published in 2004, "Regional Water Table (2002) and Ground-Water-Level Changes in the Mojave River and the Morongo Ground-Water Basins, Southwestern Mojave Desert, California", by Smith & others, U.S. Geological Survey SIR 04-5081, and make the data available for use with geographic information systems. The Mojave River and the Morongo Ground-Water Basins are in the Mojave Desert region. The rapid growth in population in these basins, which is due, in part, to their proximity to Los Angeles, has increased the demand for water. Increased pumping to meet the needs of an increasing resident population has resulted in ground-water overdraft in parts of the ground-water basin (Smith 2002). unknown publication date Complete None planned -117.662117 -116.035031 35.057328 34.095200 ISO 19115 Topic Category inlandWaters inland waters water table water level contours drainage basin ground water ground-water groundwater hydrology levels USGS none Morongo Mojave Desert Southern California California San Bernardino County none These data should not be used at scales larger than 1:100,000. U.S. Geological Survey Steven K. Predmore Geographer mailing address

4165 Spruance Road, Suite 200

San Diego CA 92101 USA 1-888-275-8747 (1-888-ASK-USGS) spredmor@usgs.gov http://water.usgs.gov/GIS/browse/contours2002.png Illlustration of data set PNG Compilation of this data set and the associated metadata was funded in cooperation with the Mojave Water Agency. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770 Chain-node topology present. This data set includes all the 2002 water-table elevation contours published on SIR 04-5081. A tiff file was obtained from the original Adobe Illustrator file use to create the original map. The tiff file was then georeferenced using known township corners. The contours were then digitized from the georeferenced tiff. C:\DOCUME~1\csglockh\LOCALS~1\Temp\xmlE.tmp 2004 The contours were edited to add the Line_type field and the WL field. 20090527 Metadata imported. 20090527 Vector String 131 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000001 0.000001 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Cont2002 Shapefile Attribute Table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. WL water level altitude contour author water level contour contour value is normally 50 feet author 25 feet contour value is normally 50 feet line_type solid, dashed, or hatchured line author Coordinates defining the features. Dashed features where uncertain. 25 feet Dashed line where uncertain U.S. Geological Survey Ask USGS - Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. How To Get the Data ESRI Shapefile. ESRI Shapefile unzip. 300KB http://water.usgs.gov/GIS/dsdl/sir04-5081_Cont2002.zip None. This dataset is provided by USGS as a public service. 20090706 U.S. Geological Survey Steven K. Predmore Geographer mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+cont2002 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998