Sharon L. Qi 2009 vector digital data Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ds543 Sharon Qi 2010 U.S. Geological Survey Data Series USGS DS543 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/ds/543/ This digital data set represents the extent of the High Plains aquifer in the central United States. The extent of the High Plains aquifer covers 174,000 square miles in eight states; Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This data set represents a compilation of information from digital and paper sources and personal communication. This boundary is an update to the boundary published in U.S. Geological Survey Professional Paper 1400-B and Open-File Report 99-267. The purpose of this data set is to refine and update the extent of the High Plains aquifer based on currently available information. This data set represents a compilation of arcs from a variety of sources and scales that represent the 174,000 square-mile extent of the High Plains aquifer within eight states: Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. Where updated information was not available, the original boundary extent defined by OFR 99-267 was retained. The citations for the sources in each state are listed below. The boundary also contains internal polygons, or "islands", that represent the areas within the aquifer boundary where the aquifer is not present due to erosion or non-deposition. Colorado: The arcs used to define the boundary were modified from Green, G.N., 1992, The digital geologic map of Colorado in ARC/INFO format: U.S. Geological Survey Open-File Report 92-507-D-O. Available at URL http://pubs.er.usgs.gov/publication/ofr92507DO Scott, G.R., 1978, Map showing geology, structure, and oil and gas fields in the Sterling 1 x 2 Quadrangle, Colorado, Nebraska, and Kansas: U.S. Geological Survey Miscellaneous Investigations Map IMAP-1092. Available at URL http://pubs.er.usgs.gov/publication/i1092 Weist, W. G., 1965, Reconnaissance of the ground-water resources in parts of Larimer, Logan, Morgan, Sedgwick, and Weld Counties, Colorado: U.S. Geological Survey Water Supply Paper 1809-L. Available at URL http://pubs.er.usgs.gov/publication/wsp1809L Kansas: U.S. Geological Survey, 1995, High Plains aquifer. Available at URL http://www.kansasgis.org/catalog/catalog.cfm Nebraska: Cederstrand, J.R., Becker, M.F., 1999, Digital map of aquifer boundary for the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Open-File Report 99-267. Available at URL http://pubs.er.usgs.gov/publication/ofr99267 New Mexico: Eifler, G.K., Jr., Reeves, C.C., Jr. and Barnes, V.E., 1974, Geologic atlas of Texas, Brownfield Sheet: University of Texas-Austin, Bureau of Economic Geology, 1 sheet, scale 1:250,000. Eifler, G.K., Jr., Reeves, C.C., Jr. and Barnes, V.E., 1976, Geologic atlas of Texas, Hobbs Sheet: University of Texas-Austin, Bureau of Economic Geology, 1 sheet, scale 1:250,000. Eifler, G.K., Jr., Reeves, C.C., Jr. and Barnes, V.E., 1977, Geologic atlas of Texas, Clovis Sheet: University of Texas-Austin, Bureau of Economic Geology, 1 sheet, scale 1:250,000. To purchase the above map sheets: Bureau of Economic Geology publications available at URL: http://www.beg.utexas.edu/mainweb/publications/pubs-CrossSecAtlas.htm Green, G.N., Jones, G.E., 1997, The digital geologic map of New Mexico in ARC/INFO format: U.S. Geological Survey Open-File Report 97-52. Available at URL http://pubs.er.usgs.gov/publication/ofr9752 Hart, D.L., McAda, D.P., 1985, Geohydrology of the High Plains Aquifer in southeastern New Mexico: U.S. Geological Survey Hydrologic Atlas 679. Available at URL http://pubs.er.usgs.gov/publication/ha679 Cederstrand, J.R., Becker, M.F., 1999, Digital map of aquifer boundary for the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Open-File Report 99-267. Available at URL http://pubs.er.usgs.gov/publication/ofr99267 Oklahoma: Becker, C.J., Runkle, D.L., Rea, A.H., 1997, Digital data sets that describe aquifer characteristics of the High Plains Aquifer in western Oklahoma: U.S. Geological Survey Open-File Report 96-451. Available at URL http://pubs.er.usgs.gov/publication/ofr96451 South Dakota: Cederstrand, J.R., Becker, M.F., 1999, Digital map of aquifer boundary for the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Open-File Report 99-267. Available at URL http://pubs.er.usgs.gov/publication/ofr99267 Texas: Texas Water Development Board, 2006, Major aquifer of Texas; NMAquifers.mdb (geodatabase); Major_aquifers (shapefile). Available at URL http://www.twdb.state.tx.us/mapping/gisdata.asp Wyoming: Cederstrand, J.R., Becker, M.F., 1999, Digital map of aquifer boundary for the High Plains Aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming: U.S. Geological Survey Open-File Report 99-267. Available at URL http://pubs.er.usgs.gov/publication/ofr99267 2009 publication date Complete None planned -106.016204 -96.228406 43.806318 31.598356 None High Plains aquifer groundwater Ogallala aquifer Ogallala Formation ground water inlandWaters aquifer boundary None High Plains Great Plains region central U.S. Colorado Kansas Nebraska New Mexico Oklahoma South Dakota Texas Wyoming None Not to be used at scales greater than the resolution of this data set (varies by state). Sharon L. Qi U.S. Geological Survey Hydrologist mailing address

1300 SE Cardinal Ct., Bldg 10, Suite 100

Vancouver WA 98683 USA 360-993-8977 360-993-8981 slqi@usgs.gov http://water.usgs.gov/GIS/browse/ds543.gif Extent of the High Plains aquifer boundary, central U.S. GIF Public Unclassified None Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 See Entity Attribute information 100 Attributes for the polygons are accurate as of publication date. Chain-node topology present. The arcs for this data set were compiled directly from the sources stated. Because the geology is mapped on a state by state basis, there were slight modifications to arcs where they approached state boundaries to smooth out differences in the location of geologic contacts between states. Varies by state. See metadata for the source data sets. None Cederstrand, J.R., and Becker, M.F. 1999 vector digital data Open File Report 99-267 Oklahoma City, OK U.S. Geological Survey http://pubs.er.usgs.gov/publication/ofr99267 1000000 online 1999 publication date OFR 99-267 The arcs representing the extent of the High Plains aquifer are from this data set except where more updated information was available (noted in the following source citations). U.S. Geological Survey 1995 vector digital data Kansas Kansas Data Access and Support Center (DASC) http://www.kansasgis.org/catalog/catalog.cfm 500000 online 1995 publication date None The arcs representing the extent of the High Plains aquifer within the state of Kansas we compiled from this data set. U.S. Geological Survey 1997 1.0 vector digital data Open-File report 96-451 Oklahoma City, OK U.S. Geological Survey http://pubs.er.usgs.gov/publication/ofr96451 250000 online 1996 publication date OFR 96-451 The arcs representing the extent of the High Plains aquifer within the state of Oklahoma are compiled from this data set Texas Water Development Board 1997 and updated in 2006 Version 1 vector digital data Texas Texas Water Development Board http://www.twdb.state.tx.us/mapping/gisdata.asp 250000 online 1997 and updated in 2006 publication date NA All of the arcs representing the High Plains aquifer in Texas are from this data set. The High Plains aquifer in Texas is considered to be the Ogallala Formation. Bureau of Economic Geology 1974-1977 maps NA NA Texas Bureau of Economic Geology The map sheets are not available digitally but can be purchased at URL: http://www.beg.utexas.edu/mainweb/publications/pubs-CrossSecAtlas.htm 250000 paper 2002 2004 publication date NA Selected arcs representing the High Plains aquifer in New Mexico are from this data set. The source 250K quad sheets used for the arcs were the Clovis, Brownfield, and Hobbs sheets. U.S. Geological Survey 1997 vector digital data Open-File Report 97-0052 New Mexico U.S. Geological Survey http://pubs.er.usgs.gov/publication/ofr9752 500000 online 1997 publication date OFR 97-0052 Selected arcs representing the High Plains aquifer in New Mexico are from this data set. This data set was used for areas further west not covered by the 250K quad sheets used in the Geologic Atlas of Texas. U.S. Geological Survey 1985 map Hydrologic Atlas 679 Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/publication/ha679 500000 paper 1985 publication date HA 679 Selected arcs representing the High Plains aquifer in New Mexico are from this report. The arcs were digitized from paper map sheets by Natalie Houston (USGS, TX) to close polygons in DeBeca, Quay, and Guadalupe Counties. The aquifer boundary in Lea County was defined by Don Hart and Doug McAda to represent the extent of the saturated zone for the Quaternary sediments in the High Plains aquifer. U.S. Geological Survey 1992 vector digital data Open-File Report 92-507 Denver, CO U.S. Geological Survey http://pubs.er.usgs.gov/publication/ofr92507DO 500000 online 1992 publication date OFR 92-0507 The arcs representing the High Plains boundary in Colorado were taken and modified from this data set by Virginia McGuire, Jennifer Stanton, and Richard Luckey (USGS). Nebraska Department of Natural Resources 2005 Version 2.0 vector digital data Lincoln, NE Nebraska Department of Natural Resources http://cohyst.dnr.state.ne.us/ online 2005 publication date NA Selected arcs representing the High Plains aquifer extent in northern Colorado and a small area in southern Wyoming (near the Colorado border) are taken from this data set. Began with the boundary extent defined by OFR 99-267. As more recent digital vector data sets were located for each state, the arcs of the original boundary were deleted and replaced by the new arcs from the state data source. The first data set to be inserted in the new boundary extent was for Kansas. The data were retrieved from the Data Access and Support Center (DASC) and consisted of arcs defining the High Plains boundary within the state of Kansas. See Supplemental Information section for source citation. USGS, High Plains aquifer extent in Kansas at URL http://www.kansasgis.org/catalog/catalog.cfm 2009 The next data set compiled for this data set was the arcs obtained from a digital vector data set of the boundary of the High Plains in the state of Oklahoma. The arcs were copied into this data set and replaced the old boundary in Oklahoma. USGS OFR 96-451 2009 The arcs representing the High Plains in New Mexico were obtained next from the digital data set received from OFR-9752 and digitized by Natalie Houston (USGS, Austin, TX) from paper BEG, Geologic Atlas of Texas maps and HA-679. In Texas, the vectors digital data were obtained from the Texas Water Development Board. BEG, Geologic Atlas of Texas USGS OFR 97-52 USGS HA 679 TWDB, 1997, updated 2006 2009 The arcs representing the High Plains boundary in Colorado were modified from the digital state geologic map of Colorado by Virginia McGuire (USGS, Lincoln, NE), Jennifer Stanton (USGS, Providence, RI), and Richard Luckey (USGS, retired) and incorporated into this data set. USGS OFR 92-507 USGS I-1092 USGS WSP-1809L 2009 After all of the updated information was compiled for this data set, the arcs representing the boundary of the aquifer near state borders needed to be slightly modified. Connecting arcs were added right along state borders to "smooth" areas where the location of geologic boundaries did not match across the border. This was required along the boders of Colorado and Wyoming, Oklahoma and Texas, Oklahoma and Kansas, Oklahoma and Colorado, and New Mexico and Texas. 2009 Metadata imported. C:\DOCUME~1\slqi\LOCALS~1\Temp\xml326C.tmp 20091023 13010700 Dataset copied. G:\HPGWAvailability\FinalHPBoundary\hpbnd09_2 20100510 13515300 Metadata imported. C:\DOCUME~1\slqi\LOCALS~1\Temp\xml3439.tmp 20100510 13564300 Vector G-polygon 199 Label point 199 GT-polygon composed of chains 199 Point 225 Albers Conical Equal Area 29.500000 45.500000 -96.000000 23.000000 0.000000 0.000000 coordinate pair 0.000001 0.000001 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 hp_bound2010 Shapefile Attribute Table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. 100 NA Shape Feature geometry. ESRI Coordinates defining the features. 100 NA AQUIFER Indicator representing the presence or absence of the aquifer Source authors High Plains aquifer Author aquifer not present Author 100 Values are accurate as of publication None planned Each polygon is labeled as "High Plains aquifer" or "aquifer not present" None U.S. 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://water.usgs.gov/user_feedback_form.html Downloadable Data Although these data have 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. 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 these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. Shapefile 2009 Spatial and attribute information Zip 2.409 http://water.usgs.gov/GIS/dsdl/ds543.zip None: This data set is provided by USGS as a public service. 20101108 2009 2009 U.S. 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+ds543 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998