Michael E. Wieczorek Andrew E. LaMotte 2010 tabular digital data Digital Data Series DS-491-13 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?mrb_e2rf1_neco This tabular data set represents the area of each level 3 nutrient ecoregion in square meters compiled for every MRB_E2RF1 catchment of the Major River Basins (MRBs, Crawford and others, 2006). The source data are from the 2002 version of the U.S. Environmental Protection Agency's (USEPA) Aggregations of Level III Ecoregions for National Nutrient Assessment & Management Strategy (USEPA, 2002). The MRB_E2RF1 catchments are based on a modified version of the U.S. Environmental Protection Agency's (USEPA) ERF1_2 and include enhancements to support national and regional-scale surface-water quality modeling (Nolan and others, 2002; Brakebill and others, 2011). Data were compiled for every MRB_E2RF1 catchment for the conterminous United States covering New England and Mid-Atlantic (MRB1), South Atlantic-Gulf and Tennessee (MRB2), the Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy (MRB3), the Missouri (MRB4), the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf (MRB5), the Rio Grande, Colorado, and the Great basin (MRB6), the Pacific Northwest (MRB7) river basins, and California (MRB8). This tabular data set was created and used by the U.S. Geological Survey (USGS) specifically to estimate the area of each level 3 nutrient ecoregion per watershed segment in the application of the national SPAtially Referenced Regression On Watershed attributes (SPARROW) model . The SPARROW model relates in-stream water-quality measurements to spatially referenced characteristics of watersheds, including contaminant sources and factors influencing terrestrial and stream transport. The model empirically estimates the origin and fate of contaminants in streams, and quantifies uncertainties in these estimates based on model coefficient error and unexplained variability in the observed data. For more information on the USGS SPARROW model please refer to: http://water.usgs.gov/nawqa/sparrow/intro/intro.html. 2002 publication date Complete None planned -127.910792 -65.327751 51.657387 23.243486 None Level 3 Nutrient Ecoregions Inlandwaters MRB_E2RF1 MRB_E2RF1WS Catchment NAWQA SPARROW None Conterminous United States MRB Major River Basins MRB1 NEMA New England and Mid-Atlantic MRB2 SAGT South Atlantic-Gulf and Tennessee MRB3 GLMR Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy MRB4 MORI Missouri MRB5 LMTG Lower Mississippi, Arkansas-White-Red, and Texas-Gulf MRB6 COGB Rio Grande, Colorado, and Great Basin MRB7 PANW Pacific Northwest MRB8 CALI California None None Michael E. Wieczorek U.S. Geological Survey mailing address

5522 Research Park Drive

Baltimore MD 21228 USA 443-498-5550 443-498-5510 mewieczo@usgs.gov http://water.usgs.gov/GIS/browse/mrb_e2rf1_neco.jpg Illlustration of data set JPG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000 Charles G. Crawford Pixie A. Hamilton Anne B. Hoos October 5, 2006 Reston, Virginia U.S. Geological Survey Prepared by Charlie Crawford, Pixie Hamilton, and Anne Hoos for a NAWQA National Liaison Meeting, Washington D.C., October 5, 2006. http://water.usgs.gov/nawqa/studies/mrb/mrb_factsheet.pdf None None Jacqueline V. Nolan John W. Brakebill Richard B. Alexander Gregory E. Schwarz Febuary 22, 2002 vector digital data USGS Open-File Report USGS Open-File Report 02-40 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?erf1_2 online 2003 publication date ERF1_2 The modified version of the source data provided a reach network to construct reach catchments for MRBs and subsequent processing (J.W. Brakebill, U.S. Geological Survey, written commun., 2008). John W. Brakebill Silvia E. Terziotti 20110222 vector digital data General Information Web Only Baltimore, MD U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?mrb_e2rf1 online 2011 publication date MRB_E2RF1 The source data provided a reach network to construct reach catchments for MRBs and subsequent processing. John W. Brakebill Silvia E. Terziotti 20110222 raster digital data General Information Web Only Baltimore, MD U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?mrb_e2rf1ws online 2011 publication date MRB_E2RF1WS The source data provided reach catchments for MRBs and subsequent processing. U.S. Environmental Protection Agency 2002 vector digital data Washington D.C. U.S. Environmental Protection Agency For additional information, contact James M. Omernik, U.S. EPA National Health and Environmental Effects Laboratory (NHEERL), 200 SW 35th St., Corvallis, OR 97333 (phone: 541-754-4458). ftp://hqwiftp.er.usgs.gov/pub/kjh/neet/usneco.html online 2002 publication date neco The source data provided information on Nutrient Ecoregions for each basin. 1) Downloaded the polygon coverage of level 3 nutrient ecoregions from ftp://hqwiftp.er.usgs.gov/pub/kjh/neet/usneco.html. 2) Converted the polygon coverage into a 100-meter GRID to match the resolution of the MRB_E2RF1 catchment GRIDs. 3) Summarized the area of each level 3 nutrient ecoregion type per catchment by using the COMBINE command in GRID. The COMBINE command combines the nutrient ecoregion and catchment GRIDs into one coverage. The resulting GRID automatically tables the area of each nutrient ecoregion per catchment. 4) Exported results into a dbf file format. 2008 neco_rf1 dbf tabulat data ESRI OID Internal feature number ESRI Sequential unique whole numbers that are automatically generated RF1ID Unique ID to relate to the item MRB_ID in the MRB_E2RF1WS catchment and MRB_E2RF1 reach coverages. U.S. Geological Survey Sequential unique whole numbers that are automatically generated NECO3_1 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Willamette and Central Valleys. U.S. Geological Survey 100 2066510700 Square meters NECO3_2 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Western Forested Mountains. U.S. Geological Survey 100 2066510700 Square meters NECO3_3 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Xeric West. U.S. Geological Survey 100 2066510700 Square meters NECO3_4 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Great Plains Grass and Shrublands. U.S. Geological Survey 100 2066510700 Square meters NECO3_5 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Central Cultivated Great Plains. U.S. Geological Survey 100 2066510700 Square meters NECO3_6 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Corn Belt and Northern Great Plains. U.S. Geological Survey 100 2066510700 Square meters NECO3_7 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Mostly Glaciated Dairy Region. U.S. Geological Survey 100 2066510700 Square meters NECO3_8 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Nutrient Poor Largely Glaciated Upper Midwest and Northeast. U.S. Geological Survey 100 2066510700 Square meters NECO3_9 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Southeastern Temperate Forested Plains and Hills. U.S. Geological Survey 100 2066510700 Square meters NECO3_10 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Texas-Louisiana Coastal and Mississippi Alluvial Plains. U.S. Geological Survey 100 2066510700 Square meters NECO3_11 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Central and Eastern Forested Uplands. U.S. Geological Survey 100 2066510700 Square meters NECO3_12 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Southern Coastal Plain. U.S. Geological Survey 100 2066510700 Square meters NECO3_13 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Southern Florida Coastal Plain. U.S. Geological Survey 100 2066510700 Square meters NECO3_14 Estimated area, in square meters, of catchment that contains level 3 nutrient ecoregion type: Eastern Coastal Plain. U.S. Geological Survey 100 2066510700 Square meters NECO3_AREA Area of catchment that source GRID covers. U.S. Geological Survey 100 2066510700 Square meters BASIN_AREA Area of catchment. U.S. Geological Survey 100 2066510700 Square meters NODATA_ARE Area of catchment that source GRID does not cover. U.S. Geological Survey 0.0 203365300000.0 Square meters COV_PERC Percent of catchment that source GRID covers. U.S. Geological Survey 0.0 100.0 Percentage U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although this dataset 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. dbf Full coverage zipped 78 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb1.zip dbf Full coverage zipped 125 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb2.zip dbf Full coverage zipped 149 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb3.zip dbf Full coverage zipped 154 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb4.zip dbf Full coverage zipped 123 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb5.zip dbf Full coverage zipped 83 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb6.zip dbf Full coverage zipped 148 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb7.zip dbf Full coverage zipped 41 KB http://water.usgs.gov/GIS/dsdl/mrb_e2rf1_neco_mrb8.zip None. This dataset is provided by the USGS as a public service. 20100817 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+mrb_e2rf1_neco FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998