Flynn, Jennifer L., Arnold, L. Rick, and Paschke, Suzanne S. 2009 raster digital data USGS Data Series Data Series 472 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ds472_dtw Arnold, L.R., Flynn, J.L., and Paschke, S.S. 2009 USGS Data Series Data Series 456 These data are in support of report DS 456 (Arnold and others, 2009). This grid represents the depth to groundwater in the High Plains Aquifer in Colorado in 2000. The depth-to-water grid was generated for the entire High Plains Aquifer from depth-to-water measurements collected in 2000. Shown as figure 12 in McMahon and others (2007). This depth-to-water grid was used as input in designing a well network to sample groundwater for agricultural chemicals in areas of agricultural irrigation overlying the High Plains Aquifer in Colorado. The grid was used to determine areas where the depth to water was less than 180 feet below land surface. Work was done in cooperation with the Colorado Department of Agriculture. Arnold, L.R., Flynn, J.L., and Paschke, S.S., 2009, Design and Installation of a groundwater monitoring-well network in the High Plains Aquifer, Colorado: U.S. Geological Survey Data Series 456. McGuire, V.L., Johnson, M.R., Schieffer, R.L., Stanton, J.S., Sebree, S.K., and Verstraeten, I.M., 2003, Water in storage and approaches to ground-water management, High Plains aquifer, 2000: U.S. Geological Survey Circular 1243, 51 p. McMahon, P.B., Dennehy, K.F., Bruce, B. W., Gurdak, J.J., and Qi, S.L., 2007, Water-quality assessment of the High Plains Aquifer, 1999-2004: U.S. Geological Survey Professional Paper 1749, 136 p. Weeks, J.B., and Gutentag, E.D., 1981, Bedrock geology, altitude of base, and 1980 saturated thickness of the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Hydrologic Investigations Atlas HA-648, scale 1:2,500,000, 2 sheets. 2000 ground condition Complete None planned -105.628822 -96.166249 43.867214 31.675294 None High Plains Aquifer Depth to groundwater inlandWaters None Eastern Colorado USA United States of America For release after final review and approval. None. Users of this geospatial database and geologic information derived there from should acknowledge the U.S. Geological Survey as the source of the data. US Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500 US Geological Survey, Colorado Water Science Center 2009 Data Series 456 US Geological Survey 2003 Circular 1243 US Geological Survey 2007 Professional Paper 1749 US Geological Survey 1981 Hydrologic Investigations Atlas 648 Checked against 2000 depth to water data and ground surface elevation. Complete in regards to available and appropriate water level data from the USGS National Water Information System. Water-table point elevations (from the year 2000) were derived from depth-to-water measurements in wells throughout the High Plains. To derive a better water-table surface where there was believed to be connection between rivers and the aquifer in the northern and central High Plains, the river stages were entered as representing the water table along the rivers. The water levels were interpolated using Kriging methods. 2000 The base-of-aquifer surface was obtained from the original mylars of 50-ft contours from the original RASA (Regional Aquifer System Assessment) study of the High Plains aquifer (Weeks and Gutentag, 1981). The contours were made into a surface using GIS. 2000 The saturated thickness data set was then clipped to the updated boundary of the aquifer. 2007 Raster data clipped to boundary of Colorado. 2008 Raster Grid Cell 1025 569 1 Albers Conical Equal Area 29.500000 45.500000 -96.000000 23.000000 0.000000 0.000000 row and column 500.000000 500.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 National Geodetic Vertical Datum of 1929 1 feet Explicit elevation coordinate included with horizontal coordinates Local surface 1 feet Attribute values ds472_dtw Depth to water 2000 Data Series 472 Value Unspecified Unspecified 0 498 feet 1 U.S. Geological Survey Ask USGS -- Water Webserver Team (http://ask.usgs.gov/) mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted material as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. This database, identified as Depth to Water in the High Plains Aquifer in Colorado, 2000, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientififc purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. ESRI GRID 15.645 http://water.usgs.gov/GIS/dsdl/ds472_dtw.zip unzip None 20090313 US Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS). http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds472_dtw FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998