US Environmental Protection Agency NHEERL-Atlantic Ecology Division 2007 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 Design Information file reports point features for lakes, ponds, and reservoirs from the sampling frame for the EPA National Lake Assessment (NLA) project. Location information is presented as well as lake characteristics, such as depth, size, accessibility and ecoregions. Key features were evaluated to determine which lakes were sampled in the NLA. The site selection for the survey ensures that EPA can make unbiased estimates concerning the health of the target population of lakes with statistical confidence. 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 -79.2277 -67.6993 47.1778 36.8415 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 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 NLA DESIGN INFORMATION NLA lakes design information to designate sampleable lakes. NA WB ID Waterbody ID NA NA NA NLA ID National Lake Assessment study unique ID NA NA NA LAKE NAME Lake name NA NA NA SITE TYPE PROB_Samp: Lake is from probability sample and can be used for population estimation. REF_Lake: Lake is not from probability sample and was selected as a candidate reference lake NA NA NA LAKE ORIGIN Lake origin (MAN-MADE, NATURAL [which includes natural lakes augmented by dams]) NA NA NA SIZE CLASS Lake area size class NA NA NA MAXIMUM DEPTH Maximum observed lake depth (m) NA 0.5 97 LAKE DEPTH Lake Depth (m) at Index Site NA 0.5 97 ELEVATION Site elevation (meters) from the National Elevation Dataset NA 0 3403 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 NHD NAME Lake name (from NHD) NA NA NA VISIT NUMBER Sequential visit number within year NA 0 1 SAMPLED Site sampled code NA NA NA DATE COLLECTED Date sample collected NA 5/8/2007 10/18/2007 REPEAT Repeat visit lake (YES/blank) NA NA NA LAKE STATUS Eval. status. _Denied (access denied). _Inaccess (physically inaccessible). _Other. _LT_4ha (< 4ha). _Shallow (< 1m deep). _Vegetated (< 1000 m2 open H2O). _Saline (tidal). Special_Purpose (aquacult., disposal, WWT, or evap.). Not_Lake (other) NA NA NA TNT STATUS Target:Non-target evaluation status derived from LAKE_SAMP NA NA NA ECOREGION LEVEL 3 NAME Omernik level 3 ecoregion name NA NA NA ECOREGION LEVEL 3 Omernik level 3 ecoregion number NA 28 84 NUTRIENT REGION NAME Nutrient ecoregion name NA NA NA NUTRIENT REGION Nutrient ecoregion, based on EPA nutrient criteria documents for lakes & reservoirs) NA NA NA REF CLUSTER NAME NLA Reference Cluster Description NA NA NA REF CLUSTER NLA Reference Site Cluster (A-G) NA NA NA FIELD SOURCE Field location source: Index_Site: location where index sample was taken. Launch_Site: point where boat was launched. Map_Loc: Location obtained from design file. Priority: lake index site; then launch site, then map location NA NA NA AREA CATEGORY Lake area unequal probability category (7 categories) NA NA NA NES LAKE NESLake-Lake was included in 1970s National Eutrophication Survey NA NA NA NES LAKE ID NESLake-Lake was included in 1970s National Eutrophication Survey NA NA NA STRATUM Probability survey design stratum. NLALake is single stratum NA NA NA PANEL Panel_1-lake was included in base design. OverSamp-Lake was part of over sample of lakes used for replacing lakes in base design if they could not be sampled NA NA NA DESIGN CATEGORY Probability survey design categories used to assign unequal probability of selection NA NA NA MD CATEGORY Unequal selection probability for lake NA 0 0.759758224 SITE WEIGHT Initial site weight based on base design. DO NOT USE for population estimation NA 0 1707.83285 ADJUSTED WEIGHT Adjusted site weight. Use for population estimation NA 0 810.6246019 URBAN Urban lake? (Yes/No) NA NA NA WSA ECOREGION 3 Wadeable Stream Assessment three aggregrated Omernik level 3 ecoregions NA NA NA WSA ECOREGION 9 Wadeable Stream Assessment nine aggregrated Omernik level 3 ecoregions NA NA NA NUTRIENT ECOREGION NLA Aggregate Nutrient Ecoregion NA NA NA FIELD FLAG Data qualifier flag for lake info data NA NA NA NUTRIENT REFERENCE SITE Nutrient Least Disturbed Reference Site (Y/N) NA NA NA LONGITUDE Longitude (decimal degrees) obtained from NHD (NAD83) NA -124.6325273 -67.2086 LATITUDE Latitude (decimal degrees) obtained from NHD (NAD83) NA 25.032719 49.073664 ALBERS X Polygon centroid x coordinates from ArcGIS geometry calculator (PCS: USA Contiguous Albers Equal Area Conic projection) NA -2312098.727 2228193.166 ALBERS Y Polygon centroid y coordinates from ArcGIS geometry calculator (PCS: USA Contiguous Albers Equal Area Conic projection) NA -1282392.792 1532272.432 FIELD LONGITUDE Longitude (decimal degrees) recorded from the field form (lake verification) NA NA NA FIELD LATITUDE Latitude (decimal degrees) recorded from the field form (lake verification) NA NA 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." 20110512 20150512 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