Steven K. Predmore 2003 maps and digital data Open-File Report OFR 03-389 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?cont1992 This data set consists of digital water-table contours for the Mojave River Basin. The U.S. Geological Survey, in cooperation with the Mojave Water Agency, constructed a water-table map of the Mojave River ground-water basin for ground-water levels measured in November 1992. Water-level data were collected from approximately 300 wells to construct the contours. The water-table contours were digitized from the paper map which was published at a scale of 1:125,000. The contour interval ranges from 3,200 to 1,600 feet above sea level. This data set is a digital representation of the contours presented on the map published in 1995, "Data and water-table map of the Mojave River ground-water basin, San Bernardino County, California, November 1992", by Christine L. Stamos and Steven K. Predmore, U.S. Geological Survey WRIR 95-4148, and make the data available for use with geographic information systems. The Mojave River Basin is located about 80 mi northeast of Los Angeles, California. The proximity of the Mojave River Basin to the highly urbanized Los Angeles region has led to a rapid growth population and, consequently, an increase in the demand for water. The Mojave River, which is the primary source of surface water to the region, normally is dry -- with the exception of a few reaches of perennial flow, and periods of flow following intense storms. The intermittent availability of surface water has forced the region to rely almost entirely on ground water to meet its agricultural and municipal needs (Stamos and Predmore 1995). 1992 publication date Complete None planned -117.652694 -116.553572 35.081956 34.364515 none Water Table Water Level Contours drainage basins ground water hydrology levels USGS inlandWaters none Mojave Southern California California San Bernardino County None None U.S. Geological Survey Steven K. Predmore Geographer mailing address

5735 Kearny Villa Road, Suite O

San Diego CA 92123 USA 1-888-275-8747 Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.3.0.800 Christine L. Stamos and Steven K. Predmore 1995 map Water-Resources Investigations Report 95-4148 Chain-node topology present. This data set includes all the 1992 water-table elevation contours published on WRIR 95-4148. 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. 2003 The contours were edited to add the Line_type field and the WL field. 2003 Vector String 102 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000256 0.000256 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Mean sea level 0.000010 feet Explicit elevation coordinate included with horizontal coordinates cont1992 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. OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape_Leng Length of feature in internal units. ESRI Positive real numbers that are automatically generated. WL Altitude of water table. Map 1,600 3,200 Feet above sea level 50 Irregular Line_type Contour line type on orignal map. Map Dashed Dashed contour line on map. (Contour approximately located.) Map Solid Solid contour line on map. Map U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html 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. Other Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/cont1992.zip None. This dataset is provided by USGS as a public service. 20041108 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://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+cont1992 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998