US Environmental Protection Agency NHEERL-Atlantic Ecology Division 2012 Narragansett, RI U.S. EPA Office of Research & Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL) http://www.epa.gov/aed/lakesecoservices The Sparrow Loads data report lake ID, latitude, longitude, EPA Region and an assigned state and county based on where the greater percentage of lake area falls. Sparrow Loads represent total average yearly nutrient loads to lakes in the Northeastern United States. These loads are from the USGS Major River Basin 1 Sparrow model. See Moore et. all 2011, DOI:10.1111/j.1752-1688.2011.00582.x for more information. The U.S. Environmental Protection Agency (EPA), in partnership with state and tribal organizations, has designed the Survey of the Nation's Lakes to periodically assess the condition of the Nation's surface waters. The National Lake Assessment is a statistical assessment of the condition of our Nation's lakes, ponds, and reservoirs. The survey is designed to: 1) Assess the condition of the Nation's Lakes; 2) Establish a baseline to compare future surveys for trends assessment and evaluate trends since the 1970's National Eutrophication Survey Study and 3) Help build State and Tribal capacity for monitoring and assessment and promote collaboration across jurisdictional boundaries. EPA Produced 20070508 20071031 Publication date Complete As needed -80.20877 -67.09310 47.41625 36.70827 ISO 19115 Topic Category environment inlandWaters EPA GIS Keyword Thesaurus Ecosystem Environment Monitoring Quality Surface Water NLA Lakes Ecosystem Services National Lakes Assessment point features sampling frame site selection unbiased estimates General Nitrogen load Phosphorus load None Connecticut Delaware Maine Maryland Massachusetts New Hampshire New Jersey New York Pennsylvania Rhode Island United States Vermont Virginia Washington DC West Virginia None None. Download data as comma delimited (csv) files at URL under Online Linkage. U.S. Environmental Protection Agency, NHEERL-Atlantic Ecology Division Jeff Hollister Principal Investigator mailing and physical address

27 Tarzwell Drive

Narragansett RI 02882 (401) 782-9655 hollister.jeff@epa.gov hollister.jeff@epa.gov FIPS Pub 199 No Confidentiality Standard Technical Controls Test of Valid Values Complete Data were collected using methods that are accurate to within 26-100 meters (EPA National Geospatial Data Policy [NGDP] Accuracy Tier 4). For more information, please see EPA's NGDP at http://epa.gov/geospatial/policies.html. 0.000001 Calibration of GPS unit and availability of back-up GPS unit. Data underwent Quality Assurance checks and were loaded into Oracle. 20101231 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 1980 6378137.000000 298.257222 SPARROW LOADS DATA The Sparrow Loads represent total average yearly nutrient loads to lakes in the Northeastern United States derived from USGS Major River Basin 1 Sparrow model. NA WB ID Waterbody ID NA NA NA LATITUDE Latitude (decimal degrees) for lake centroid NA NA NA LONGITUDE Longitude (decimal degrees) for lake centroid NA STATE CODE State assigned by US EPA-AED within which the greater percentage of lake area falls NA NA NA COUNTY County assigned by US EPA-AED within which the greater percentage of lake area falls NA NA NA EPA REGION EPA Region assigned by State NA NA NA FLOW Flow (m3/yr) for all flowlines within a lake NA 78725.5433 11887145252.8 NITROGEN LOAD Nitrogen load (kg/yr) to a lake NA 25.52478 10312606.1202 PHOSPHORUS LOAD Phosphorus load (kg/yr) to a lake NA 0.002355 718281.595333 The National Lakes Assessment (NLA) is one component of the National Aquatic Resource Surveys. This program is the first-ever assessment of lakes across the continental United States using consistent protocols and a modern, scientifically defensible statistical survey approach. The Design Information file reports point features for lakes, ponds, and reservoirs from the sampling frame for the EPA National Lake Assessment (NLA) project. Key features were evaluated to determine which lakes were sampled in the NLA. To be included, a site had to be a natural or man-made freshwater lake, pond or reservoir, greater than 10 acres (4 hectares), at least 3.3 feet (1 meter) deep, and with a minimum of a quarter acre (0.1 hectare) open water. After applying the criteria, 68,223 waterbodies were considered lakes by the NLA definition and thus comprised the target population. Of these, 49,546 lakes could be accessed and a total of 1,028 lakes were sampled and represent the total lake population. For quality assurance purposes, 10% of the target lakes were randomly selected for a second sampling later in the summer. The greater the number of sites sampled, the more confidence in the results. The number of sites included in the survey allows EPA to determine the percentage of lakes nationwide and within predetermined ecoregions that exceed a threshold of concern with 95% confidence. USEPA. 2007. Survey of the Nation's Lakes. Field Operations Manual. EPA 841-B-07-004. US Environmental Protection Agency, Washington, DC. U.S. Environmental Protection Agency, NHEERL-Atlantic Ecology Division Jeff Hollister Principal Investigator mailing and physical address

27 Tarzwell Drive

Narragansett RI 02882 (401) 782-9655 hollister.jeff@epa.gov hollister.jeff@epa.gov Downloadable Data "Although these data have been processed successfully on a computer system at the Environmental Protection Agency, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Environmental Protection Agency shall not be held liable for improper or incorrect use of the data described and/or contained herein." 20120910 20160910 U.S. Environmental Protection Agency, NHEERL-Atlantic Ecology Division Jeff Hollister Principal Investigator mailing and physical address

27 Tarzwell Drive

Narragansett RI 02882 (401) 782-9655 hollister.jeff@epa.gov hollister.jeff@epa.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998