Michael E. Wieczorek Andrew E. LaMotte 2010 tabular digital data Digital Data Series DS-490-09 Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nhd_eco3 This data set represents the estimated area of level 3 ecological landscape regions (ecoregions), as defined by Omernik (1987), compiled for every catchment of NHDPlus for the conterminous United States. The source data set is Level III Ecoregions of the Continental United States (U.S. Environmental Protection Agency, 2003). The NHDPlus Version 1.1 is an integrated suite of application-ready geospatial datasets that incorporates many of the best features of the National Hydrography Dataset (NHD) and the National Elevation Dataset (NED). The NHDPlus includes a stream network (based on the 1:100,00-scale NHD), improved networking, naming, and value-added attributes (VAAs). NHDPlus also includes elevation-derived catchments (drainage areas) produced using a drainage enforcement technique first widely used in New England, and thus referred to as "the New England Method." This technique involves "burning in" the 1:100,000-scale NHD and when available building "walls" using the National Watershed Boundary Dataset (WBD). The resulting modified digital elevation model (HydroDEM) is used to produce hydrologic derivatives that agree with the NHD and WBD. Over the past two years, an interdisciplinary team from the U.S. Geological Survey (USGS), and the U.S. Environmental Protection Agency (USEPA), and contractors, found that this method produces the best quality NHD catchments using an automated process (USEPA, 2007). The NHDPlus dataset is organized by 18 Production Units that cover the conterminous United States. The NHDPlus version 1.1 data are grouped by the U.S. Geologic Survey's Major River Basins (MRBs, Crawford and others, 2006). MRB1, covering the New England and Mid-Atlantic River basins, contains NHDPlus Production Units 1 and 2. MRB2, covering the South Atlantic-Gulf and Tennessee River basins, contains NHDPlus Production Units 3 and 6. MRB3, covering the Great Lakes, Ohio, Upper Mississippi, and Souris-Red-Rainy River basins, contains NHDPlus Production Units 4, 5, 7 and 9. MRB4, covering the Missouri River basins, contains NHDPlus Production Units 10-lower and 10-upper. MRB5, covering the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf River basins, contains NHDPlus Production Units 8, 11 and 12. MRB6, covering the Rio Grande, Colorado and Great Basin River basins, contains NHDPlus Production Units 13, 14, 15 and 16. MRB7, covering the Pacific Northwest River basins, contains NHDPlus Production Unit 17. MRB8, covering California River basins, contains NHDPlus Production Unit 18. This spatial data set was created and used by the U.S. Geological Survey (USGS) specifically to estimate the area of each level 3 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 Ecoregions Inlandwaters NHDPlus Catchment NAWQA SPARROW None Conterminous United States MRB Major River Basin 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 US Geological Survey, Maryland Water Science Center Geographer mailing address

5522 Research Park Drive

Baltimore MD 21228 USA 443-498-5550 mewieczo@usgs.gov 8:00am-4:30pm MST Please contact thru email http://water.usgs.gov/GIS/browse/nhd_eco3.jpg Illustration of the dataset 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 U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/NewEngland/NHDPlus01V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 1. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/MidAtlantic/NHDPlus02V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 1. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/SouthAtlanticGulf/NHDPlus03V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 2. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/GreatLakes/NHDPlus04V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus05V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus06V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 2. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus07V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus08V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 5. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/SourisRedRainy/NHDPlus09V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 3. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus10LV01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 4. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus10UV01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 4. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Mississippi/NHDPlus11V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 5. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/TexasGulf/NHDPlus12V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 5. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/RioGrande/NHDPlus13V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Colorado/NHDPlus14V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/Colorado/NHDPlus15V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/GreatBasin/NHDPlus16V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 6. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/PacificNorthwest/NHDPlus17V01_02_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 7. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection U.S. Geological Survey 2007 vector digital data Washington, D.C. U.S. Environmental Protection Agency ftp://ftp.horizon-systems.com/NHDPlus/NHDPlusV1/California/NHDPlus18V01_01_Catshape.zip online 2007 publication date NHD The source data provided catchments for basin characterization for MRB 8. COMID is the unique item in NHDPlus that relates to the dbf files containing artificial drainage information. U.S. Environmental Protection Agency 2003 vector digital data Washington D.C. U.S. Environmental Protection Agency Omernik, J.M. 1987. Ecoregions of the Conterminous United States. Map (scale 1:7,500,000). Annals of the Association of American Geographers, v. 77, no. 1, p. 118-125. http://www.epa.gov/wed/pages/ecoregions/level_iii.htm online 2003 publication date eco3 The source data provided information on ecoregions. 1) Downloaded the polygon coverage of ecoregions from http://www.epa.gov/wed/pages/ecoregions/level_iii.htm 2) Converted the polygon coverage into a 30-meter GRID to match the resolution of the NHDPlus catchment GRIDs downloaded from http://www.horizon-systems.com/nhdplus 3) Summarized the area of each ecoregion by catchment using the COMBINE command in GRID. The COMBINE command combines the ecoregion and catchment GRIDs into one GRID. The resulting GRID automatically tables the area of each ecoregion per catchment. 4) Exported results into a dbf file format. 2008 COMID code eco3 dbf tabular data ESRI OID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. COMID Unique ID to relate to the NHDPlus catchments NHDPlus Sequential unique whole numbers that are automatically generated. ECO3_1 Estimated area in square meters of catchment that is described by the ecological region: Coast Range U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_2 Estimated area in square meters of catchment that is described by the ecological region: Puget Lowland U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_3 Estimated area in square meters of catchment that is described by the ecological region: Willamette Valley U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_4 Estimated area in square meters of catchment that is described by the ecological region: Cascades U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_5 Estimated area in square meters of catchment that is described by the ecological region: Sierra Nevada U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_6 Estimated area in square meters of catchment that is described by the ecological region: Southern and Central California Chaparral and Oak Woodlands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_7 Estimated area in square meters of catchment that is described by the ecological region: Central California Valley U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_8 Estimated area in square meters of catchment that is described by the ecological region: Southern California Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_9 Estimated area in square meters of catchment that is described by the ecological region: Eastern Cascades Slopes and Foothills U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_10 Estimated area in square meters of catchment that is described by the ecological region: Columbia Plateau U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_11 Estimated area in square meters of catchment that is described by the ecological region: Blue Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_12 Estimated area in square meters of catchment that is described by the ecological region: Snake River Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_13 Estimated area in square meters of catchment that is described by the ecological region: Central Basin and Range U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_14 Estimated area in square meters of catchment that is described by the ecological region: Mojave Basin and Range U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_15 Estimated area in square meters of catchment that is described by the ecological region: Northern Rockies U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_16 Estimated area in square meters of catchment that is described by the ecological region: Idaho Batholith U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_17 Estimated area in square meters of catchment that is described by the ecological region: Middle Rockies U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_18 Estimated area in square meters of catchment that is described by the ecological region: Wyoming Basin U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_19 Estimated area in square meters of catchment that is described by the ecological region: Wasatch and Uinta Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_20 Estimated area in square meters of catchment that is described by the ecological region: Colorado Plateaus U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_21 Estimated area in square meters of catchment that is described by the ecological region: Southern Rockies U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_22 Estimated area in square meters of catchment that is described by the ecological region: Arizona/New Mexico Plateau U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_23 Estimated area in square meters of catchment that is described by the ecological region: Arizona/New Mexico Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_24 Estimated area in square meters of catchment that is described by the ecological region: Chihuahuan Deserts U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_25 Estimated area in square meters of catchment that is described by the ecological region: High Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_26 Estimated area in square meters of catchment that is described by the ecological region: Southwestern Tablelands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_27 Estimated area in square meters of catchment that is described by the ecological region: Central Great Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_28 Estimated area in square meters of catchment that is described by the ecological region: Flint Hills U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_29 Estimated area in square meters of catchment that is described by the ecological region: Cross Timbers U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_30 Estimated area in square meters of catchment that is described by the ecological region: Edwards Plateau U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_31 Estimated area in square meters of catchment that is described by the ecological region: Southern Texas Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_32 Estimated area in square meters of catchment that is described by the ecological region: Texas Blackland Prairies U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_33 Estimated area in square meters of catchment that is described by the ecological region: East Central Texas Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_34 Estimated area in square meters of catchment that is described by the ecological region: Western Gulf Coastal Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_35 Estimated area in square meters of catchment that is described by the ecological region: South Central Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_36 Estimated area in square meters of catchment that is described by the ecological region: Ouachita Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_37 Estimated area in square meters of catchment that is described by the ecological region: Arkansas Valley U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_38 Estimated area in square meters of catchment that is described by the ecological region: Boston Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_39 Estimated area in square meters of catchment that is described by the ecological region: Ozark Highlands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_40 Estimated area in square meters of catchment that is described by the ecological region: Central Irregular Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_41 Estimated area in square meters of catchment that is described by the ecological region: Canadian Rockies U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_42 Estimated area in square meters of catchment that is described by the ecological region: Northwestern Glaciated Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_43 Estimated area in square meters of catchment that is described by the ecological region: Northwestern Great Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_44 Estimated area in square meters of catchment that is described by the ecological region: Nebraska Sand Hills U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_45 Estimated area in square meters of catchment that is described by the ecological region: Piedmont U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_46 Estimated area in square meters of catchment that is described by the ecological region: Northern Glaciated Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_47 Estimated area in square meters of catchment that is described by the ecological region: Western Corn Belt Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_48 Estimated area in square meters of catchment that is described by the ecological region: Lake Agassiz Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_49 Estimated area in square meters of catchment that is described by the ecological region: Northern Minnesota Wetlands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_50 Estimated area in square meters of catchment that is described by the ecological region: Northern Lakes and Forests U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_51 Estimated area in square meters of catchment that is described by the ecological region: North Central Hardwood Forests U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_52 Estimated area in square meters of catchment that is described by the ecological region: Driftless Area U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_53 Estimated area in square meters of catchment that is described by the ecological region: Southeastern Wisconsin Till Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_54 Estimated area in square meters of catchment that is described by the ecological region: Central Corn Belt Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_55 Estimated area in square meters of catchment that is described by the ecological region: Eastern Corn Belt Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_56 Estimated area in square meters of catchment that is described by the ecological region: Southern Michigan/Northern Indiana Drift Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_57 Estimated area in square meters of catchment that is described by the ecological region: Huron/Erie Lake Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_58 Estimated area in square meters of catchment that is described by the ecological region: Northeastern Highlands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_59 Estimated area in square meters of catchment that is described by the ecological region: Northeastern Coastal Zone U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_60 Estimated area in square meters of catchment that is described by the ecological region: Northern Appalachian Plateau and Uplands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_61 Estimated area in square meters of catchment that is described by the ecological region: Erie Drift Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_62 Estimated area in square meters of catchment that is described by the ecological region: North Central Appalachians U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_63 Estimated area in square meters of catchment that is described by the ecological region: Middle Atlantic Coastal Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_64 Estimated area in square meters of catchment that is described by the ecological region: Northern Piedmont U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_65 Estimated area in square meters of catchment that is described by the ecological region: Southeastern Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_66 Estimated area in square meters of catchment that is described by the ecological region: Blue Ridge U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_67 Estimated area in square meters of catchment that is described by the ecological region: Ridge and Valley U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_68 Estimated area in square meters of catchment that is described by the ecological region: Southwestern Appalachians U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_69 Estimated area in square meters of catchment that is described by the ecological region: Central Appalachians U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_70 Estimated area in square meters of catchment that is described by the ecological region: Western Alleghany Plateau U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_71 Estimated area in square meters of catchment that is described by the ecological region: Interior Plateau U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_72 Estimated area in square meters of catchment that is described by the ecological region: Interior River Valleys and Hills U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_73 Estimated area in square meters of catchment that is described by the ecological region: Mississippi Alluvial Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_74 Estimated area in square meters of catchment that is described by the ecological region: Mississippi Valley Loess Plains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_75 Estimated area in square meters of catchment that is described by the ecological region: Southern Coastal Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_76 Estimated area in square meters of catchment that is described by the ecological region: Southern Florida Coastal Plain U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_77 Estimated area in square meters of catchment that is described by the ecological region: North Cascades U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_78 Estimated area in square meters of catchment that is described by the ecological region: Klamath Mountains U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_79 Estimated area in square meters of catchment that is described by the ecological region: Madrean Archipelago U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_80 Estimated area in square meters of catchment that is described by the ecological region: Northern Basin and Range U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_81 Estimated area in square meters of catchment that is described by the ecological region: Sonoran Basin and Range U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_82 Estimated area in square meters of catchment that is described by the ecological region: Laurentian Plains and Hills U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_83 Estimated area in square meters of catchment that is described by the ecological region: Eastern Great Lakes and Hudson Lowlands U.S. Geological Survey 900.0 67849006000.0 Square meters ECO3_84 Estimated area in square meters of catchment that is described by the ecological region: Atlantic Coastal Pine Barrens U.S. Geological Survey 900.0 67849006000.0 Square meters BASIN_AREA Area of catchment in square meters U.S. Geological Survey 900.0 67849006000.0 Square meters NODATA_ARE Area of catchment that source GRID does not cover U.S. Geological Survey 0.0 67847890000.0 Square meters COV_PERC Percent of catchment that source GRID covers U.S. Geological Survey 0.0 100.0 Percentage ECO3_AREA Area of catchment that source GRID covers U.S. Geological Survey 900.0 9899176000.0 Square meters 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 3892 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb1.zip dbf Full coverage zipped 8320 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb2.zip dbf Full coverage zipped 8883 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb3.zip dbf Full coverage zipped 8319 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb4.zip dbf Full coverage zipped 7113 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb5.zip dbf Full coverage zipped 6215 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb6.zip dbf Full coverage zipped 4409 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_mrb7.zip dbf Full coverage zipped 2595 KB http://water.usgs.gov/GIS/dsdl/nhd_eco3_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+nhd_eco3 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998