Nakagaki, Naomi 201004 Version 1.0, April 2010 vector digital data Sacramento, CA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?warpbas2010 This data set consists of 204 drainage basin boundaries for U.S. Geological Survey's (USGS) stream sites sampled in the National Water Quality Assessment (NAWQA) Program and the National Stream Quality Accounting Network (NASQAN). These drainage basin boundaries are used to generate watershed characteristics for the development of water-quality models. The basin boundaries were collected from USGS hydrologists and geographers from 1995 through 2008. Correspondingly, the scale or resolution of the boundaries varies, and common boundaries shared by adjacent and nested drainage basins are not entirely coincident. About 60% of the basin boundaries were developed from data sources at the scale of 1:24,000 or resolution of 30-meters or less. Overall, the basin boundaries at the lower resolution represent large, major drainage basins. The 204 drainage basins range in size from about 10 square kilometers to over 2,000,000 square kilometers. Collectively, the drainage basins cover approximately 60% of the conterminous United States, and include a number of nested basins. These drainage basin boundaries are used to characterize stream sites in the current and future development of Watershed Regression for Pesticides (WARP) models (Stone and Gilliom, 2009; Stone and others, 2008; Larson and others, 2004). PURPOSE REFERENCES: Stone, W.W. and Gilliom, R.J., 2009, Update of watershed regressions for pesticides (WARP) for predicting atrazine concentration in streams: U.S. Geological Survey Open-File Report 2009-1122, 22 p., accessed March 9, 2010, at http://pubs.usgs.gov/of/2009/1122/ Stone, W.W., Gilliom, R.J., and Crawford, C.G., 2008, Watershed regressions for pesticides (WARP) for predicting annual maximum and maximum moving-average concentrations of atrazine in streams: U.S. Geological Survey Open-File Report 08-1186, 19 p., accessed March 9, 2010, at http://pubs.usgs.gov/of/2008/1186/ Larson, S.J., Crawford, C.G., and Gilliom, R.J., 2004, Development and application of watershed regressions for pesticides (WARP) for estimating atrazine concentration distributions in streams: U.S. Geological Survey Water-Resources Investigations Report 03-4047, 68 p., accessed March 9, 2010, at http://pubs.usgs.gov/wri/wri034047/ BACKGROUND INFORMATION: This data set is an aggregation of basin delineations developed from 1995 to 2008 by USGS hydrologists and geographers across the country. The majority of these basins were developed for the NAWQA program, which began in 1991 (Gilliom and others, 1995) and continues to date (Gilliom and others, 2001). The drainage basin boundaries were collected from 1995 by the National Synthesis Project of the NAWQA Program to create nationally-consistent watershed characteristics to support regional and national water-quality studies. The basins are used in a geographic information system (GIS) to overlay with national thematic map layers of various environmental features including land cover, precipitation, etc. The data sources and methods that were used to delineate the watershed boundaries vary, with vector-based boundaries from 1:24,000 to 1:250,000-scale, and raster-based boundaries from 6 to 80-meter resolution. The basins are attributed with the resolution or scale of the source data. Minor edits have been made to some of the original basin geodatasets to ensure consistency, which included the horizontal coordinate transformation from horizontal datum NAD27 to NAD83, the elimination of extra psuedo nodes and internal polygons, and the addition of new attributes. Future developments of the WARP model may include more detailed basin boundaries for some of the 204 sites or new sites. BACKGROUND INFORMATION REFERENCES: Gilliom, R.J., Alley, W.M., and Gurtz, M.E., 1995, Design of the National Water-Quality Assessment Program: Occurrence and distribution of water-quality conditions: U.S. Geological Survey Circular 1112, 33 p., accessed March 9, 2010, at http://water.usgs.gov/pubs/circ/circ1112/ Gilliom, R.J., Hamilton, P.A., and Miller, T.L., 2001, The national water-quality assessment program - Entering a new decade of investigations, U.S. Geological Survey Fact Sheet 071-01, 6 p., accessed March 9, 2010, at http://pubs.usgs.gov/fs/fs-071-01/pdf/fs07101.pdf NAMING CONVENTIONS OF BASINS: Each drainage basin is stored as a separate data layer, and is identified by "b" concatenated with the USGS site-identification number (STAID). DOCUMENTATION There is a metadata file for each basin data set stored as text files in the "DOCUMENTATION" folder. The metadata files have the same naming convention as the drainage basins, but end with the ".txt" extension. The documentation indicate the source and methods used to delineate the basins. The original metadata files have been updated to reflect any changes made to projection parameters, distribution, and point of contact information. TYPE OF DRAINAGE AREAS: For the majority of the basins, the contributing and total drainage areas are identical, and are labeled as "contrb" in the "BAS_TYPE" field in the basin's attribute table. The (13) basins that include noncontributing drainage areas or closed basins are attributed as "total". The noncontributing drainage areas are not separately delineated, with one exception, the basin for the Rio Grande near Brownsville, TX, STAID 08475000. The USGS site-identification number (STAID), percentage of noncontributing drainage area to the total drainage area (% NONCONTRB), total drainage area in square kilometers (BAS_SQKM), and site name (SIT_NAME) for these 13 drainage basins are listed below: STAID % NONCONTRB BAS_SQKM SIT_NAME 01104615 9 695 Charles River above Watertown Dam at Watertown, MA 06214500 3 30,576 Yellowstone River at Billings, MT 06295000 2 103,981 Yellowstone River at Forsyth, MT 06329500 1 178,929 Yellowstone River near Sidney, MT 06768000 8 147,623 Platte River near Overton, NE 06770500 8 151,214 Platte River near Grand Island, NE 06800500 15 17,989 Elkhorn River at Waterloo, NE 06805500 17 220,908 Platte River at Louisville, NE 07263620 14 408,209 Arkansas River at David D Terry Lock and Dam below Little Rock, AR 08364000 9 86,467 Rio Grande at El Paso, TX 09514000 * 116,964 Buckeye Canal near Avondale, AZ 10171000 7 9,093 Jordan River at 1700 South Road at Salt Lake City, UT 11074000 34 5,857 Santa Ana River below Prado Dam, CA *not available due to water diversions into the canal DRAINAGE BASINS EXTENDING BEYOND THE U.S. BORDER: Eleven of the 204 watersheds extend beyond the U.S. border. The USGS site-identification number (STAID), the percentage of the basin within the U.S.(% in US), the total drainage area in square kilometers (BAS_SQKM), and site name (SIT_NAME) for these basins are listed below: STAID % IN US BAS_SQKM SIT_NAME 08475000 51 523,825 Rio Grande near Brownsville, TX 14246900 85 670,285 Columbia River at Beaver Army Terminal near Quincy, OR 06185500 89 239,753 Missouri River near Culbertson, MT 12213140 94 2,024 Nooksack River at Brennan, WA 05102490 95 92,086 Red River of the North at Pembina, ND 06610000 97 830,776 Missouri River at Omaha, NE 09514000 98 116,964 Buckeye Canal near Avondale, AZ 06934500 98 1,346,054 Missouri River at Hermann, MO 07022000 99 1,839,670 Mississippi River at Thebes, IL 01184000 99 25,049 Connecticut River at Thompsonville, CT 07373420 99 2,965,463 Mississippi River near St. Francisville, LA ATYPICAL WATERSHEDS: There are several atypical watersheds which are described below: --The watershed boundary for site 08475000 (Rio Grande near Brownsville, TX), excludes an interior polygon that represents a noncontributing drainage area. Therefore, the interior polygon, with an area of 53,645 square kilometers, is not part of the (contributing) watershed. --For two sites, the water-quality sampling took place downstream from the USGS gaging site. Consequently, watersheds for these two sites are delineated from the actual sampling location rather than the USGS gaging site. Specifically, a) the basin boundary "b02175000.shp" corresponds to 11 km south of the USGS gaging site 02175000 (Edisto River near Givhans, SC), and b) the basin boundary "b02469762.shp" corresponds to 2 km south of the USGS gaging site 02469762 (Tombigbee River below Coffeeville Lock & Dam near Coffeeville, AL). --The watershed boundary for site 11273500 (Merced River at River Road Bridge near Newman, CA), consists of two isolated polygons due to artificial canals. --Five basins were extracted from existing publications and are listed below. The four basins from the source "NASQAN" were extracted from U.S. Geological Survey (2004); the one basin from the source "NE3071" was extracted from Godberson and others (2006): STAID SIT_NAME SOURCE 05420500 Mississippi River at Clinton, IA NASQAN 06185500 Missouri River near Culbertson, MT NASQAN 08364000 Rio Grande at El Paso, TX NASQAN 08475000 Rio Grande near Brownsville, TX NASQAN 06880800 West Fork Big Blue River near Dorchester, NE NE3071 ATYPICAL WATERSHEDS REFERENCES: Godberson, J.A., Zelt, R.B., and Zoller A.L., 2006, Drainage areas for selected stream-sampling stations, Missouri River Basin, Version 1.2.1, January 2006, accessed February 4, 2009 at http://water.usgs.gov/lookup/getspatial?ne-3071 U.S. Geological Survey, 2004, Watersheds for U.S. Geological Survey National Stream Quality Accounting Network (NASQAN) sampling sites, 1996-2000, Edition 1.0, accessed May 29, 2008 at http://water.usgs.gov/lookup/getspatial?nasqan2k 1995 2008 The time period during which the drainage basin boundaries were delineated. Complete Although this data set is considered complete at this time, there may be future releases of basin boundaries due to added sites or enhanced drainage basin boundaries. -127.87 -65.35 48.24 22.87 none inlandWaters NAWQA National Water Quality Assessment NASQAN National Stream Quality Accounting Network WARP Watershed Regressions for Pesticides model watershed regression model drainage basin river basin catchment basin boundary drainage area none Conterminous United States None 1. Because these drainage basins were created by a number of people over a time period using different data sources and methods, boundaries of nested and adjacent basins are not entirely coincident. 2. Contact information in individual basin metadata files may reference a person no longer with the USGS. In these cases, it is advised to contact the state USGS representative for the Water Science Center office corresponding to the site. The contact information for the USGS Water Science Centers is available from http://www.usgs.gov/contact_us/. 3. Acknowledgment of the USGS would be appreciated. U.S. Geological Survey Naomi Nakagaki Geographer mailing and physical address

CSUS Placer Hall 6000 J Street

Sacramento CA 95819 USA (916) 278-3092 (916) 278-3071 nakagaki@usgs.gov http://water.usgs.gov/GIS/browse/warpbas2010.jpg Illustration of data set JPEG Reviews of the metadata and data set were provided by Al Rea, Michaela Johnson, and Tana Haluska, all with the U.S. Geological Survey. This metadata file was also reviewed by Bernie J. McNamara. Much appreciation goes to the many USGS hydrologists and geographers who spent countless hours developing drainage basin boundaries that comprise this data set. The majority of the drainage basins were developed prior to the availability of automated basin delineation tools. The names of these USGS hydrologists and geographers are listed below in alphabetical order: Terri L. Arnold, Nancy T. Baker, Kymm K. Barnes, Robert L. Baskin, William B. Blanks, Richard W. Bell, Steven Bolssen, John W. Brakebill, Gary R. Buell, Daniel T. Button, Jimmy M. Clark, Joseph F. Connell, Lance M. Cooper, Patricia D'Arconte, A.L. Derosier, Janet M. Denis, Ross G. Dickinson, Paul C. Dunne, Jean A. Dupree, Sarah M. Flanagan, Douglas A. Freehafer, JoAnn M. Gronberg, Alan L. Haggland, Paul E. Hanson, Laura L. Hallberg, John S. Harvill, Craig A. Harvey, Julian A. Heilman, Scott A. Hoffman, Evelyn H. Hopkins, Hank Johnson, Michaela R. Johnson, Tyler Y. Johnson, S.K. Kelley, Janet Kelley, Moon H. Kim, Donna L. Knifong, David L. Lorenz, Lori Mattern, Molly A. Maupin, David S. McCulloch, Gerard McMahon, Rose L. Medina, Reavis L. Mitchell III, Matthew W. Moix, Daniel K. Pearson, Jack Pflaumer, David T. Poynter, Julie A.H. Rees, Jennifer Lanning-Rush, James I. Sams III, Chris A. Sanocki, A. Alejandro Sepulveda, Steven Sobieszczyk, Peter A. Steeves, Verlin C. Stephens, Jana S. Stewart, Silvia E. Terziotti, Frank D. Voss, Michael E. Wieczorek, Daniel S. Yeatts, and Ronald B. Zelt Microsoft Windows XP Professional ESRI ArcGIS Desktop 9.3 Service Pack 1 Stone, W.W. and Gilliom, R.J. 2009 U.S. Geological Survey Open-File Report 2009-1122 http://pubs.usgs.gov/of/2009/1122/ Stone, W.W., Gilliom, R.J., and Crawford, C.G. 2008 U.S. Geological Survey Open-File Report 2008-1186 http://pubs.usgs.gov/of/2008/1186/ Larson, S.J., Crawford, C.G., and Gilliom, R.J. 2004 U.S. Geological Survey Water-Resources Investigations Report 2003-4047 http://pubs.usgs.gov/wri/wri034047/ The attribute values were inspected and found to be consistently coded as described in the Entity and Attribute Information Section. Polygon and chain-node topology present and all polygons are closed. The drainage area for the USGS site, 04193490 (Maumee River near Waterville, OH) is excluded from this dataset because the boundary for 04193500 (Maumee River at Waterville, OH) was used to represent the drainage for 04193490. To avoid confusion, the basin boundary for 04193490 is not part of this dataset. Visual checks with background maps of hydrography, shaded relief, and U.S. Geological Survey sampling sites were conducted to ensure watershed delineations are adequate for computing parameters used in the WARP model. The accuracy for a basin boundary is variable as they were derived from many different sources with varying scales or resolutions. The following attributes were added to the basin's attribute table: drainage area in square kilometers (BAS_SQKM); type of drainage basin (BAS_TYPE); scale or resolution of the source data (BAS_SRC); latitude coordinate of the site (SIT_LAT83); longitude coordinate of the site (SIT_LON83), and name of site (SIT_NAME). 201004 To ensure consistency amongst the data structure and attribute tables of the 204 basins, minor edits have been made to the original geospatial data. These edits included the elimination of extra psuedo nodes and polygons or slivers contained within the outer boundary, and the horizontal coordinate transformation from horizontal datum NAD27 to NAD83 where necessary. 200901 Metadata imported. C:\DOCUME~1\NAKAGA~1\LOCALS~1\Temp\xmlBE3.tmp 20100421 11401700 Vector G-polygon 1 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 10.00004482269 10.00004482269 Meters North American Datum of 1983 GRS1980 6378206.4 294.98 Bxxxxxxxx.DBF where "xxxxxxxx" represents the USGS site-identification number Vector attribute table Arc/Info (R) GIS software STAID Numeric identifier for the site corresponding to the drainage basin USGS National Water Information System (NWIS) database, as of December 2009 USGS site identification number C1 SID from USGS National Water Information System (NWIS) database BAS_SQKM Area of drainage basin, in square kilometers determined by the GIS software. Area is calculated with the basin boundary in the national albers projection (projection parameters are listed under Spatial_Reference_Information). USGS Real numbers Drainage area in square kilometers User assigned BAS_TYPE Type of drainage represented by the boundary. USGS contrb contributing drainage basin User assigned total total drainage basin User assigned BAS_SRC Scale or resolution of the source(s) used to delineate the boundary The metadata files from USGS authors of drainage basin boundary 24k,100k,250k,500k,6-m,10-m,30-m,60-m,80-m 24k = 1:24,000-scale 100k = 1:100,000-scale 250k = 1:250,000-scale 500k = 1:500,000-scale 6-m = 6-meter resolution 10-m = 10-meter resolution 30-m = 30-meter resolution 60-m = 60-meter resolution 80-m = 80-meter resolution User assigned SIT_LAT83 Latitude of the USGS site corresponding to the drainage basin, in horizontal datum NAD83, decimal degrees USGS National Water Information System (NWIS) database, as of December 2009, for all but 10 sites (see Attribute_Definition_Source) Positive floating number Latitude of the site, in decimal degrees, NAD83 C909 SLATD from USGS NWIS SIT_LON83 Longitude of the USGS site corresponding to the drainage basin, in horizontal datum NAD83, decimal degrees USGS National Water Information System (NWIS) database, as of December 2009, except for the following 10 sites: STAID SIT_NAME 02083500 Tar River at Tarboro, NC 02215100 Tucsawhatchee Creek near Hawkinsville, GA 03354000 White River near Centerton, IN 05062500 Wild Rice River at Twin Valley, MN 05465500 Iowa River at Wapello, IA 05584500 La Moine River at Colmar, IL 06185500 Missouri River near Culbertson, MT 07379960 Dawson Creek at Bluebonnet Blvd. near Baton Rouge, LA 10102200 Cub River near Richmond, UT 10168000 Little Cottonwood Creek @ Jordan River near SLC, UT The geographic coordinates for the above listed USGS sites do not match with the latitude and longitude coordinates in the USGS National Water Information System (NWIS) database because they were found to be slightly offset. As a result, the corrected coordinates were determined and populated into the basin's attribute table. Negative floating number Longitude of the site, in decimal degrees, NAD83 C910 SLONGD from USGS NWIS SIT_NAME Name of the USGS site corresponding to the drainage basin USGS National Water Information System (NWIS) database, as of December 2009 Site names USGS site name C900 SNAME from USGS NWIS database COMMENT Comment regarding unique issue(s) related to the basin or site USGS Free text Comment regarding unique issue(s) related to the basin or site. Not populated for most sites. User assigned U.S. Geological Survey Ask USGS - Water Webserver Team mailing

445 National Center

Reston VA 20192 USA 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 these 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. ESRI Shapefiles Shapefiles for each drainage basin winzip 11.617 MB http://water.usgs.gov/GIS/dsdl/warpbas2010.zip None. This dataset is provided by USGS as a public service. 201004 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+warpbas2010 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998